How long is the flight from London to Illinois?

There are many flights that can get you from London to Illinois in 11h 25m. Fly via Scandinavian Airlines, Icelandair, or SWISS to get the fastest option. Airlines will cover a distance of 3960 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

What are the cheapest airlines to fly from London to Illinois one-way?

For one-way options, check prices for Delta. According to our data, you can fly for as low as £376. Users have also found prices from £380 and £399 on British Airways and Virgin Atlantic, respectively.

In terms of precipitation, rainfall in Illinois ranges from 43.0 - 125.0 inches per month. August is typically the wettest month, when rainfall can reach 125.0 mm. January is typically the driest time to visit Illinois when rainfall is around 43.0 mm.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -5.0 C).

What are the most popular routes from London to Illinois?

While some choose either London Gatwick - Chicago O'Hare Intl or London Heathrow - Chicago Midway, London Heathrow - Chicago O'Hare Intl is the most popular route from London to Illinois.

What are the cheapest flights from London to Illinois?

Looking for the cheapest flight from London to Illinois? While on average our users pay £1,259, our data indicates the cheapest price to be £400. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £377.

What are the most reliable airlines from London to Illinois?

Before booking your flight to Illinois from London, check out the most reliable airlines to get you to your destination on time: Air Canada (84%), Austrian Airlines (84%), United Airlines( 84%).

What are the most popular airlines that fly from London to Illinois?

When booking a flight from London to Illinois, you may want to consider flying on British Airways, Lufthansa or Icelandair as they are the most popular for this route.

Can I find deals for flights from London to Illinois that include hotel bookings?

Yes. In addition to deals on London to Illinois flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from London to Illinois?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Illinois.

Can I find deals for business class flights from London to Illinois?

Yes. Cheapflights offers flight deals from London to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£248+ Flights from London to Illinois

Cheap flight deals from London to Illinois

Round-trip from	£395
One-way from	£248
Popular in	July
Cheapest in	February
Average price	£536
Good round-trip deal	£493 or less
Good one-way deal	£468 or less

19/11-5/12
4 total stops
32h 30m total
London to Illinois

Search Deals

13/11
1 total stop
26h 20m total
London to Illinois

Search Deals

Highest demand for flights based on searches. 13% potential increase in price (£61 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).

Search Deals

Average for round-trip flights in October 2025

Search Deals

Price to beat on a round-trip flight from London (LON) to Illinois.

Search Deals

Price to beat on a one-way flight from London (LON) to Illinois.

Search Deals

Find flight deals from London to Illinois

Enter your travel dates to find the best prices.

Cheapest flights from London to Illinois
Explore the most affordable flight options available from London to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 October 2025.

Wed 19/1108:50LGW - ORD

2 stops14h 30mMultiple Airlines

Fri 5/1218:30ORD - LGW

2 stops18h 00mMultiple Airlines

Deal found 16/10£395

Wed 19/1106:50LTN - ORD

2 stops16h 30mMultiple Airlines

Fri 5/1218:30ORD - LTN

2 stops15h 45mMultiple Airlines

Deal found 16/10£395

Wed 19/1108:30STN - ORD

2 stops14h 50mMultiple Airlines

Fri 5/1218:30ORD - STN

2 stops16h 05mMultiple Airlines

Deal found 16/10£395

Sat 6/1214:00LGW - ORD

2 stops56h 54mMultiple Airlines

Sat 13/1212:09ORD - LGW

1 stop15h 56mMultiple Airlines

Deal found 15/10£397

Wed 12/1119:30LHR - ORD

1 stop27h 15mScandinavian Airlines

Wed 19/1119:20ORD - LHR

1 stop16h 20mScandinavian Airlines

Deal found 15/10£397

Mon 17/1108:30STN - ORD

2 stops14h 50mMultiple Airlines

Mon 1/1218:30ORD - STN

2 stops13h 50mMultiple Airlines

Deal found 16/10£397

Tue 18/1119:50LHR - ORD

2 stops26h 55mScandinavian Airlines

Thu 27/1119:20ORD - LHR

1 stop16h 20mScandinavian Airlines

Deal found 15/10£398

Sat 6/1206:30STN - ORD

2 stops16h 50mMultiple Airlines

Tue 9/1218:30ORD - STN

2 stops13h 50mMultiple Airlines

Deal found 16/10£398

Fri 31/1010:20LHR - ORD

1 stop12h 25mScandinavian Airlines

Fri 7/1119:20ORD - LHR

1 stop14h 40mScandinavian Airlines

Deal found 16/10£398

Mon 3/1107:05LHR - ORD

2 stops15h 40mScandinavian Airlines

Sat 8/1119:20ORD - LHR

1 stop20h 20mScandinavian Airlines

Deal found 15/10£400

Fri 7/1115:15STN - ORD

3 stops31h 30mMultiple Airlines

Sun 16/1119:20ORD - STN

2 stops21h 40mMultiple Airlines

Deal found 16/10£400

Thu 6/1114:00LGW - ORD

1 stop28h 26mMultiple Airlines

Mon 17/1106:40ORD - LGW

1 stop17h 20mMultiple Airlines

Deal found 16/10£401

Best flights from London to Illinois
Discover carefully curated flight deals from London to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 17 October 2025.

Fri 7/1115:15STN - ORD

3 stops31h 30mMultiple Airlines

Sun 16/1119:20ORD - STN

2 stops21h 40mMultiple Airlines

Deal found 16/10£400

Wed 12/1119:30LHR - ORD

1 stop27h 15mScandinavian Airlines

Sat 22/1119:20ORD - LHR

1 stop17h 10mScandinavian Airlines

Deal found 16/10£409

Thu 13/1113:45LHR - ORD

1 stop32h 35mUnited Airlines

Sat 15/1115:55ORD - LHR

1 stop32h 35mUnited Airlines

Deal found 15/10£411

Mon 10/1111:55LGW - ORD

1 stop11h 25mIcelandair

Thu 20/1118:30ORD - LGW

1 stop10h 25mIcelandair

Deal found 15/10£442

Thu 20/1119:10LCY - ORD

1 stop23h 35mSWISS

Mon 24/1116:10ORD - LCY

1 stop14h 45mSWISS

Deal found 16/10£509

Tue 25/1106:30LHR - MDW

2 stops16h 08mDelta

Wed 10/1213:50MDW - LHR

1 stop11h 15mDelta

Deal found 14/10£514

Wed 12/1111:45LHR - MDW

2 stops17h 55mVirgin Atlantic

Wed 19/1110:47MDW - LHR

2 stops14h 03mVirgin Atlantic

Deal found 15/10£514

Mon 17/1108:20LHR - STL

1 stop14h 07mBritish Airways

Mon 1/1214:08STL - LHR

1 stop11h 12mBritish Airways

Deal found 16/10£540

Thu 5/312:30LGW - STL

2 stops49h 36mAmerican Airlines

Mon 9/319:05STL - LGW

2 stops56h 55mAmerican Airlines

Deal found 15/10£544

Tue 13/111:45LHR - STL

2 stops14h 54mKLM

Fri 23/111:51STL - LHR

2 stops12h 59mKLM

Deal found 16/10£579

Fri 7/1113:05LTN - ORD

3 stops33h 40mMultiple Airlines

Sun 16/1119:20ORD - LTN

2 stops20h 40mMultiple Airlines

Deal found 16/10£403

Thu 6/1118:40LHR - ORD

1 stop28h 05mScandinavian Airlines

Thu 13/1119:20ORD - LHR

1 stop20h 20mScandinavian Airlines

Deal found 16/10£409

Mon 17/1111:55LGW - ORD

1 stop11h 25mIcelandair

Tue 25/1118:30ORD - LGW

1 stop10h 25mIcelandair

Deal found 16/10£444

Thu 8/114:00LGW - ORD

1 stop33h 04mMultiple Airlines

Fri 23/106:05ORD - LGW

1 stop21h 55mMultiple Airlines

Deal found 14/10£406

Wed 12/1119:30LHR - ORD

1 stop27h 15mScandinavian Airlines

Sun 23/1119:20ORD - LHR

1 stop14h 40mScandinavian Airlines

Deal found 16/10£409

Mon 17/1111:55LGW - ORD

1 stop11h 25mIcelandair

Thu 27/1118:30ORD - LGW

1 stop10h 25mIcelandair

Deal found 16/10£444

Thu 20/1116:30STN - ORD

2 stops30h 15mMultiple Airlines

Sun 23/1119:20ORD - STN

2 stops21h 40mMultiple Airlines

Deal found 16/10£407

Wed 12/1118:40LHR - ORD

1 stop28h 05mScandinavian Airlines

Wed 26/1119:20ORD - LHR

1 stop14h 40mScandinavian Airlines

Deal found 16/10£409

Tue 25/1108:40LHR - MDW

2 stops15h 28mDelta

Wed 3/1212:50MDW - LHR

2 stops13h 55mDelta

Deal found 15/10£514

Mon 17/1119:10LCY - ORD

1 stop23h 35mSWISS

Mon 1/1221:35ORD - LCY

2 stops15h 05mSWISS

Deal found 17/10£529

Mon 17/1108:55LHR - MDW

1 stop13h 44mVirgin Atlantic

Mon 1/1209:34MDW - LHR

1 stop17h 11mVirgin Atlantic

Deal found 16/10£529

Mon 17/1111:55LGW - ORD

1 stop11h 25mIcelandair

Wed 26/1118:30ORD - LGW

1 stop10h 25mIcelandair

Deal found 16/10£444

Fri 14/1110:20LHR - ORD

1 stop12h 25mScandinavian Airlines

Fri 28/1119:20ORD - LHR

1 stop14h 40mScandinavian Airlines

Deal found 16/10£409

Sat 6/1206:00LTN - ORD

2 stops17h 20mMultiple Airlines

Tue 9/1218:30ORD - LTN

2 stops19h 35mMultiple Airlines

Deal found 16/10£410

Wed 12/1106:30LHR - MDW

2 stops17h 38mDelta

Wed 19/1113:47MDW - LHR

1 stop11h 18mDelta

Deal found 15/10£514

Tue 13/106:45LHR - STL

2 stops21h 59mBritish Airways

Fri 23/111:55STL - LHR

1 stop12h 55mBritish Airways

Deal found 16/10£567

Thu 5/313:10LHR - STL

1 stop13h 08mAmerican Airlines

Mon 9/314:48STL - LHR

1 stop12h 02mAmerican Airlines

Deal found 16/10£578

Thu 13/1119:10LCY - ORD

1 stop23h 35mSWISS

Mon 24/1116:10ORD - LCY

1 stop14h 45mSWISS

Deal found 16/10£532

Mon 1/1220:05LCY - ORD

2 stops32h 38mVirgin Atlantic

Mon 8/1214:30ORD - LCY

2 stops21h 55mVirgin Atlantic

Deal found 17/10£532

Mon 17/1106:40LHR - ORD

1 stop16h 05mScandinavian Airlines

Mon 24/1119:20ORD - LHR

1 stop17h 10mScandinavian Airlines

Deal found 16/10£409

Direct flights from London to Illinois
Explore direct flight options from London to Illinois based on user searches, and compare prices and availability for your desired travel dates. Data last updated 17 October 2025.

Mon 17/1110:25LHR - ORD

Nonstop9h 20mLufthansa

Mon 1/1221:05ORD - LHR

Nonstop8h 10mLufthansa

Deal found 15/10£457

Wed 12/1113:35LHR - ORD

Nonstop9h 25mLufthansa

Mon 17/1115:45ORD - LHR

Nonstop8h 10mLufthansa

Deal found 15/10£459

Wed 12/1113:35LHR - ORD

Nonstop9h 25mAustrian Airlines

Wed 11/215:45ORD - LHR

Nonstop8h 10mAustrian Airlines

Deal found 15/10£460

Mon 24/1107:55LHR - ORD

Nonstop9h 20mLufthansa

Tue 2/1215:45ORD - LHR

Nonstop8h 10mLufthansa

Deal found 16/10£462

Mon 17/1112:35LHR - ORD

Nonstop8h 50mBritish Airways

Mon 1/1217:10ORD - LHR

Nonstop7h 45mBritish Airways

Deal found 17/10£471

Wed 18/210:25LHR - ORD

Nonstop9h 20mAustrian Airlines

Tue 3/315:45ORD - LHR

Nonstop8h 10mAustrian Airlines

Deal found 15/10£471

Mon 17/1107:55LHR - ORD

Nonstop9h 20mAustrian Airlines

Mon 1/1215:45ORD - LHR

Nonstop8h 10mAustrian Airlines

Deal found 15/10£473

Tue 18/1113:35LHR - ORD

Nonstop9h 25mLufthansa

Wed 26/1115:45ORD - LHR

Nonstop8h 10mLufthansa

Deal found 15/10£474

Mon 17/1113:35LHR - ORD

Nonstop9h 25mAustrian Airlines

Tue 25/1115:45ORD - LHR

Nonstop8h 10mAustrian Airlines

Deal found 15/10£475

Tue 18/1110:25LHR - ORD

Nonstop9h 20mAustrian Airlines

Mon 24/1117:50ORD - LHR

Nonstop8h 05mAustrian Airlines

Deal found 15/10£476

Tue 25/1114:10LHR - ORD

Nonstop8h 50mBritish Airways

Wed 3/1217:10ORD - LHR

Nonstop7h 45mBritish Airways

Deal found 15/10£477

Last-minute flights from London to Illinois
Discover last-minute flight deals from London to Illinois. Data last updated 17 October 2025 and is based on user searches.

Fri 31/1010:20LHR - ORD

1 stop12h 25mScandinavian Airlines

Fri 7/1119:20ORD - LHR

1 stop14h 40mScandinavian Airlines

Deal found 16/10£398

Sat 1/1106:40LHR - ORD

1 stop16h 05mScandinavian Airlines

Wed 5/1119:20ORD - LHR

2 stops17h 30mScandinavian Airlines

Deal found 16/10£401

Mon 3/1107:05LHR - ORD

2 stops15h 40mScandinavian Airlines

Sat 8/1119:20ORD - LHR

1 stop20h 20mScandinavian Airlines

Deal found 15/10£400

Thu 6/1114:00LGW - ORD

1 stop28h 26mMultiple Airlines

Mon 17/1106:40ORD - LGW

1 stop17h 20mMultiple Airlines

Deal found 16/10£401

Fri 7/1115:15STN - ORD

3 stops31h 30mMultiple Airlines

Sun 16/1119:20ORD - STN

2 stops21h 40mMultiple Airlines

Deal found 16/10£400

Fri 7/1115:35LHR - ORD

2 stops31h 10mScandinavian Airlines

Fri 28/1119:20ORD - LHR

2 stops39h 05mScandinavian Airlines

Deal found 15/10£403

Wed 12/1119:30LHR - ORD

1 stop27h 15mScandinavian Airlines

Wed 19/1119:20ORD - LHR

1 stop16h 20mScandinavian Airlines

Deal found 15/10£397

Mon 17/1108:30STN - ORD

2 stops14h 50mMultiple Airlines

Mon 1/1218:30ORD - STN

2 stops13h 50mMultiple Airlines

Deal found 16/10£397

Tue 18/1118:30LHR - ORD

1 stop26h 30mTAP AIR PORTUGAL

Fri 28/1120:15ORD - LHR

1 stop16h 40mTAP AIR PORTUGAL

Deal found 15/10£398

Wed 19/1108:50LGW - ORD

2 stops14h 30mMultiple Airlines

Fri 5/1218:30ORD - LGW

2 stops18h 00mMultiple Airlines

Deal found 16/10£395

Wed 19/1106:50LTN - ORD

2 stops16h 30mMultiple Airlines

Fri 5/1218:30ORD - LTN

2 stops15h 45mMultiple Airlines

Deal found 16/10£395

Wed 19/1108:30STN - ORD

2 stops14h 50mMultiple Airlines

Fri 5/1218:30ORD - STN

2 stops16h 05mMultiple Airlines

Deal found 16/10£395

One-way flights from London to Illinois
Search for one-way flight options from London to Illinois. Find affordable one-way fares based on user searches. Data last updated 17 October 2025.

Thu 13/1114:00LGW - STL

1 stop26h 20mMultiple Airlines

Deal found 15/10£248

Fri 7/1114:00LGW - STL

2 stops25h 07mMultiple Airlines

Deal found 16/10£301

Mon 10/1114:00LGW - STL

3 stops49h 07mMultiple Airlines

Deal found 15/10£305

Sun 7/1213:00LGW - STL

2 stops26h 52mMultiple Airlines

Deal found 15/10£325

Sat 15/1108:30LGW - STL

3 stops31h 42mMultiple Airlines

Deal found 15/10£340

Wed 15/413:30LHR - STL

1 stop12h 33mMultiple Airlines

Deal found 16/10£367

Wed 15/406:30LHR - STL

2 stops16h 19mDelta

Deal found 16/10£376

Fri 24/1010:55LGW - STL

2 stops28h 12mMultiple Airlines

Deal found 14/10£377

Sat 14/307:30LHR - STL

2 stops19h 18mBritish Airways

Deal found 15/10£380

Wed 15/407:45LCY - STL

2 stops18h 46mDelta

Deal found 16/10£383

Sun 7/1217:20LHR - STL

2 stops32h 09mMultiple Airlines

Deal found 15/10£388

Thu 27/1114:00LGW - MDW

2 stops30h 40mMultiple Airlines

Deal found 15/10£397

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

STN - ORD

STNORD

London Stansted

Fri 7/11

15:15-16:45

3 stops31h 30m

Chicago O'Hare Intl

Sun 16/11

19:20-23:00

2 stops21h 40m

£400

LondonChicago

LTN - ORD

LTNORD

London Luton

Fri 7/11

13:05-16:45

3 stops33h 40m

Chicago O'Hare Intl

Sun 16/11

19:20-22:00

2 stops20h 40m

£403

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 8/1

14:00-17:04

1 stop33h 04m

Chicago O'Hare Intl

Fri 23/1

06:05-10:00

1 stop21h 55m

£406

LondonChicago

STN - ORD

STNORD

London Stansted

Thu 20/11

16:30-16:45

2 stops30h 15m

Chicago O'Hare Intl

Sun 23/11

19:20-23:00

2 stops21h 40m

£407

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 12/11

19:30-16:45

1 stop27h 15m

Chicago O'Hare Intl

Sat 22/11

19:20-18:30

1 stop17h 10m

£409

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 6/11

18:40-16:45

1 stop28h 05m

Chicago O'Hare Intl

Thu 13/11

19:20-21:40

1 stop20h 20m

£409

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 12/11

19:30-16:45

1 stop27h 15m

Chicago O'Hare Intl

Sun 23/11

19:20-16:00

1 stop14h 40m

£409

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 12/11

18:40-16:45

1 stop28h 05m

Chicago O'Hare Intl

Wed 26/11

19:20-16:00

1 stop14h 40m

£409

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 14/11

10:20-16:45

1 stop12h 25m

Chicago O'Hare Intl

Fri 28/11

19:20-16:00

1 stop14h 40m

£409

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 17/11

06:40-16:45

1 stop16h 05m

Chicago O'Hare Intl

Mon 24/11

19:20-18:30

1 stop17h 10m

£409

Flights are sorted by cheapest return flights first.

Deals found on 15/10

Showing 1-10 of 60 results

...

Best time to book a flight from London to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from London with our price prediction graph.

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London to Illinois

What is the cheapest month to book a flight from London to Illinois?

Currently, March is the cheapest month in which you can book a flight from London to Illinois (average of £301). Flying from London to Illinois in July is currently the most expensive (average of £501). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LON to IL?

Unlike in the afternoon, when flights are generally more expensive, you can save up to 23% on flights from London to Illinois by exploring options for tickets in the evening.

What is the cheapest day to fly from London to Illinois?

Travellers seeking maximum savings on their London to Illinois flight should consider departing on Thursday afternoons when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from London to Illinois

The most flights from LON to USIL are scheduled on a Monday (47 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (47 on average).

Reviews of airlines servicing Illinois

Read reviews from past customers who have flown with Finnair, Aer Lingus, andIcelandair from London to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Finnair

7.6

Good

1,332 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

Finnair

7.6

Good

1,332 reviews

Finnair

7.6

Good

1,332 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

Aer Lingus

7.2

Good

1,341 reviews

Finnair

7.6

Good

1,332 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

Icelandair

7.0

Good

556 reviews

Finnair

7.6

Good

1,332 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

Lufthansa

6.8

Okay

7,500 reviews

Finnair

7.6

Good

1,332 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

British Airways

6.7

Okay

7,459 reviews

Finnair

7.6

Good

1,332 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

Related info for your journey

How long is the flight from London to Illinois?
There are many flights that can get you from London to Illinois in 11h 25m. Fly via Scandinavian Airlines, Icelandair, or SWISS to get the fastest option. Airlines will cover a distance of 3960 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines to fly from London to Illinois one-way?
For one-way options, check prices for Delta. According to our data, you can fly for as low as £376. Users have also found prices from £380 and £399 on British Airways and Virgin Atlantic, respectively.
What are the most popular routes from London to Illinois?
While some choose either London Gatwick - Chicago O'Hare Intl or London Heathrow - Chicago Midway, London Heathrow - Chicago O'Hare Intl is the most popular route from London to Illinois.
What are the most reliable airlines from London to Illinois?
Before booking your flight to Illinois from London, check out the most reliable airlines to get you to your destination on time: Air Canada (84%), Austrian Airlines (84%), United Airlines( 84%).
What are the cheapest flights from London to Illinois?
Looking for the cheapest flight from London to Illinois? While on average our users pay £1,259, our data indicates the cheapest price to be £400. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £377.
Can I find deals for flights from London to Illinois that include hotel bookings?
Yes. In addition to deals on London to Illinois flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from London to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Illinois.
Can I find deals for business class flights from London to Illinois?
Yes. Cheapflights offers flight deals from London to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from London to Illinois?
Currently, March is the cheapest month in which you can book a flight from London to Illinois (average of £301). Flying from London to Illinois in July is currently the most expensive (average of £501). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for London to Illinois

Heathrow to John F Kennedy Intl flights

Heathrow to Newark flights

Gatwick to John F Kennedy Intl flights

Heathrow to LaGuardia flights

London City to John F Kennedy Intl flights

Gatwick to Newark flights

Stansted to John F Kennedy Intl flights

Luton to John F Kennedy Intl flights

London City to Newark flights

Heathrow to Miami flights

Gatwick to LaGuardia flights

Stansted to Newark flights

Luton to Newark flights

Heathrow to Orlando flights

Heathrow to Los Angeles flights

Manchester to John F Kennedy Intl flights

Heathrow to Dulles Intl flights

Heathrow to Dallas/Fort Worth flights

Heathrow to San Francisco flights

Heathrow to Boston flights

London City to LaGuardia flights

Heathrow to Las Vegas flights

Heathrow to Baltimore flights

Gatwick to Orlando flights

Heathrow to O'Hare Intl flights

Gatwick to Miami flights

Heathrow to Seattle flights

London City to Miami flights

Manchester to Orlando flights

Heathrow to Tampa flights

Heathrow to Hobby flights

Heathrow to Atlanta flights

Manchester to Newark flights

Manchester to LaGuardia flights

London City to Orlando flights

Heathrow to Philadelphia flights

Gatwick to Los Angeles flights

Edinburgh to Newark flights

London City to Los Angeles flights

Gatwick to San Francisco flights

Stansted to Miami flights

Heathrow to George Bush Intcntl flights

Heathrow to Reagan-National flights

London City to Boston flights

Gatwick to Dulles Intl flights

Gatwick to Dallas/Fort Worth flights

Heathrow to Santa Ana flights

Gatwick to Boston flights

London City to San Francisco flights

Gatwick to Las Vegas flights

Complete your trip

Illinois car hire

Chicago O'Hare Intl Airport car hire

Chicago Midway Airport car hire

Moline Quad-City Airport car hire

Greater Peoria Airport car hire

Bloomington-Normal Airport car hire

Chicago Greater Rockford Airport car hire

Champaign University-Willard Airport car hire

Springfield Capital Airport car hire

Belleville Airport car hire

Marion Williamson County Airport car hire

Quincy Regional Airport car hire

Direct flights to United States

Top 10 airlines flying from London to Illinois

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£312	Average£484	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Virgin Atlantic	Cheapest£345	Average£550	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Scandinavian Airlines	Cheapest£356	Average£497	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
Aer Lingus	Cheapest£368	Average£576	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
TAP AIR PORTUGAL	Cheapest£368	Average£613	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
Brussels Airlines	Cheapest£386	Average£541	FlexibilityNo cancel fee	On-timeN/A	Search Brussels Airlines flights
Lufthansa	Cheapest£396	Average£575	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Austrian Airlines	Cheapest£401	Average£589	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights
British Airways	Cheapest£404	Average£568	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
United Airlines	Cheapest£408	Average£677	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

Fly with Cheapflights

How does Cheapflights help users find flights from London to Illinois?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Illinois from London today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from London to Illinois?

Cheapflights simply makes it quick and affordable to book flights from London to Illinois by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from London to Illinois with no change fees?

Certainly. Search results for flights to Illinois from London shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from London to Illinois become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Illinois from London today and book when prices fit your budget.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

Cheap flights from London to Illinois from £248

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 13/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from London to Illinois

Keep the following information in mind while searching for London to Illinois flight deals. Data was last updated 17 October 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from London to Illinois

Cheapest flights from London to IllinoisExplore the most affordable flight options available from London to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 October 2025.

Explore the most affordable flight options available from London to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 October 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from London to Illinois that are best for you.

Best time to book a flight from London to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from London with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from London to Illinois

What is the cheapest month to book a flight from London to Illinois?

What is the cheapest time of day to fly from LON to IL?

Find hourly flight availability from London to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 17 October 2025.

What is the cheapest day to fly from London to Illinois?

Use this chart to determine the cheapest time to fly return from London to Illinois. Price data was last updated on 16 December 2024.

Weekly flight availability from London to Illinois

Explore weekly flight availability from London to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 17 October 2025.

Reviews of airlines servicing Illinois

Read reviews from past customers who have flown with Finnair, Aer Lingus, andIcelandair from London to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from London to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

How long is the flight from London to Illinois?

What are the cheapest airlines to fly from London to Illinois one-way?

What are the most popular routes from London to Illinois?

What are the most reliable airlines from London to Illinois?

What are the cheapest flights from London to Illinois?

Can I find deals for flights from London to Illinois that include hotel bookings?

How can I find direct flights from London to Illinois?

Can I find deals for business class flights from London to Illinois?

What is the cheapest month to book a flight from London to Illinois?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for London to Illinois

See prices for flight routes from nearby airports that may be better suited for you.

Top 10 airlines flying from London to Illinois

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from London to Illinois?

Why should you use Cheapflights to find cheap flight tickets from London to Illinois?

Can Cheapflights find flights from London to Illinois with no change fees?

Can Cheapflights notify me if prices for flights from London to Illinois become cheaper?

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from London to Illinois
Explore the most affordable flight options available from London to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 October 2025.