How long is the flight from London to Illinois?

There are many flights that can get you from London to Illinois in 11h 05m. Fly via Scandinavian Airlines, United Airlines, or Icelandair to get the fastest option. Airlines will cover a distance of 3939 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 £400. Users have also found prices from £405 and £407 on Virgin Atlantic and Brussels Airlines, 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 £802, our data indicates the cheapest price to be £410. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £330.

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 (75%), Austrian Airlines (75%), United Airlines( 75%).

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 American Airlines, Finnair or British Airways as they are the most popular for this route.

How far in advance should I book a flight from London to Illinois?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 56 days in advance, which can save you up to 35% on flights from London to Illinois compared to booking the week you need them. Waiting 56 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at £488. For sooner than that we have options available in the next 3 days from £658.

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

February is one of the best times of the year to fly to Illinois from London. Prices for February average £509 per person but you can even find prices for as low as £312. The most expensive prices can be found in the month of July. Opting for a February flight can save you 25% on your journey compared to booking in July

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.

£307+ Flights from London to Illinois

Cheap flight deals from London to Illinois

Round-trip from	£394
Popular in	July
Cheapest in	February
Average price	£436
Good round-trip deal	£494 or less
Good one-way deal	£491 or less

9/10-15/10
2 total stops
56h 36m total
London to Illinois

Search Deals

Highest demand for flights based on searches. 14% potential increase in price (£61 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 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

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 15 September 2025.

Wed 1/1009:50LHR - ORD

1 stop11h 55mBritish Airways

Mon 6/1017:40ORD - LHR

Nonstop7h 40mBritish Airways

Deal found 15/9£394

Wed 15/1015:30LGW - ORD

2 stops27h 05mMultiple Airlines

Wed 22/1006:40ORD - LGW

1 stop17h 40mMultiple Airlines

Deal found 15/9£394

Fri 3/1007:40LHR - ORD

1 stop14h 05mAmerican Airlines

Fri 10/1013:43ORD - LHR

1 stop10h 37mAmerican Airlines

Deal found 14/9£394

Mon 22/914:00LGW - ORD

1 stop32h 12mMultiple Airlines

Sun 5/1006:00ORD - LGW

1 stop22h 10mMultiple Airlines

Deal found 15/9£395

Fri 19/906:50LHR - ORD

1 stop11h 15mMultiple Airlines

Mon 22/921:50ORD - LHR

Nonstop7h 55mMultiple Airlines

Deal found 12/9£395

Fri 3/1013:05LGW - ORD

2 stops34h 34mMultiple Airlines

Tue 7/1011:13ORD - LGW

1 stop13h 07mMultiple Airlines

Deal found 14/9£396

Mon 8/1219:50LHR - ORD

2 stops50h 55mScandinavian Airlines

Sat 10/119:20ORD - LHR

1 stop14h 40mScandinavian Airlines

Deal found 14/9£396

Sat 27/914:00LGW - ORD

1 stop34h 50mMultiple Airlines

Sat 11/1018:58ORD - LGW

1 stop33h 12mMultiple Airlines

Deal found 12/9£397

Thu 9/1007:45LHR - ORD

2 stops14h 50mUnited Airlines

Tue 14/1014:39ORD - LHR

1 stop10h 16mUnited Airlines

Deal found 15/9£397

Wed 1/1012:20LGW - ORD

2 stops16h 52mAmerican Airlines

Mon 6/1013:43ORD - LGW

1 stop12h 27mAmerican Airlines

Deal found 15/9£397

Thu 6/1112:35LHR - ORD

Nonstop8h 50mBritish Airways

Wed 12/1121:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 13/9£397

Sun 14/1212:15LHR - ORD

1 stop11h 05mIcelandair

Thu 15/118:30ORD - LHR

1 stop19h 00mIcelandair

Deal found 15/9£398

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 15 September 2025.

Tue 9/1207:05LHR - ORD

2 stops39h 40mScandinavian Airlines

Fri 9/119:20ORD - LHR

1 stop14h 40mScandinavian Airlines

Deal found 14/9£396

Wed 1/1007:45LHR - ORD

2 stops14h 50mUnited Airlines

Sun 12/1014:08ORD - LHR

1 stop13h 27mUnited Airlines

Deal found 14/9£397

Mon 15/1212:15LHR - ORD

1 stop11h 05mIcelandair

Thu 15/118:30ORD - LHR

1 stop19h 00mIcelandair

Deal found 15/9£398

Fri 26/906:50LHR - ORD

1 stop11h 15mMultiple Airlines

Sun 28/921:25ORD - LHR

Nonstop8h 20mMultiple Airlines

Deal found 15/9£403

Thu 30/1013:35LHR - ORD

Nonstop9h 25mAustrian Airlines

Thu 6/1117:50ORD - LHR

Nonstop8h 05mAustrian Airlines

Deal found 15/9£414

Thu 9/1009:15LHR - ORD

1 stop14h 21mBritish Airways

Mon 13/1016:52ORD - LHR

1 stop11h 28mBritish Airways

Deal found 14/9£418

Fri 3/1008:40LHR - ORD

2 stops15h 24mDelta

Tue 7/1018:20ORD - LHR

1 stop10h 40mDelta

Deal found 14/9£422

Fri 14/1106:30LHR - MDW

2 stops17h 48mVirgin Atlantic

Sat 22/1113:47MDW - LHR

1 stop11h 18mVirgin Atlantic

Deal found 13/9£422

Wed 1/1008:45LCY - ORD

1 stop12h 10mLufthansa

Thu 9/1015:05ORD - LCY

1 stop11h 15mLufthansa

Deal found 14/9£441

Fri 7/1121:25LGW - ORD

2 stops47h 20mTAP AIR PORTUGAL

Fri 28/1120:15ORD - LGW

1 stop13h 30mTAP AIR PORTUGAL

Deal found 15/9£454

Tue 16/1218:40LGW - ORD

1 stop27h 40mSWISS

Mon 12/118:35ORD - LGW

2 stops17h 15mSWISS

Deal found 15/9£495

Sat 13/1220:35LHR - ORD

1 stop26h 45mIcelandair

Thu 8/118:30ORD - LHR

1 stop19h 00mIcelandair

Deal found 14/9£400

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 15 September 2025.

Wed 29/1010:25LHR - ORD

Nonstop9h 20mLufthansa

Wed 5/1117:50ORD - LHR

Nonstop8h 05mLufthansa

Deal found 14/9£396

Thu 6/1112:35LHR - ORD

Nonstop8h 50mBritish Airways

Wed 12/1121:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 13/9£397

Fri 3/1012:15LHR - ORD

Nonstop8h 35mBritish Airways

Mon 6/1020:40ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 14/9£398

Fri 7/1112:35LHR - ORD

Nonstop8h 50mBritish Airways

Mon 10/1121:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 14/9£399

Sat 1/1112:35LHR - ORD

Nonstop8h 40mBritish Airways

Fri 14/1117:10ORD - LHR

Nonstop7h 45mBritish Airways

Deal found 15/9£400

Mon 24/1115:45LHR - ORD

Nonstop9h 00mBritish Airways

Sun 30/1121:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 15/9£400

Mon 6/1008:30LHR - ORD

Nonstop9h 00mAustrian Airlines

Sun 12/1021:25ORD - LHR

Nonstop8h 20mAustrian Airlines

Deal found 13/9£407

Thu 30/1007:40LHR - ORD

Nonstop9h 20mUnited Airlines

Thu 6/1115:45ORD - LHR

Nonstop8h 10mUnited Airlines

Deal found 15/9£408

Wed 19/1111:00LHR - ORD

Nonstop8h 50mBritish Airways

Sun 23/1121:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 14/9£409

Sat 27/908:30LHR - ORD

Nonstop9h 00mUnited Airlines

Sat 4/1021:25ORD - LHR

Nonstop8h 20mUnited Airlines

Deal found 15/9£413

Fri 6/210:25LHR - ORD

Nonstop9h 20mUnited Airlines

Fri 20/215:45ORD - LHR

Nonstop8h 10mUnited Airlines

Deal found 15/9£414

Sun 9/1114:10LHR - ORD

Nonstop8h 50mBritish Airways

Thu 13/1121:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 13/9£414

Last-minute flights from London to Illinois
Discover last-minute flight deals from London to Illinois. Data last updated 15 September 2025 and is based on user searches.

Sat 20/906:00LHR - ORD

1 stop12h 55mMultiple Airlines

Wed 24/916:00ORD - LHR

Nonstop8h 20mMultiple Airlines

Deal found 14/9£396

Sat 20/906:00LHR - ORD

1 stop12h 55mMultiple Airlines

Thu 25/914:53ORD - LHR

1 stop12h 47mMultiple Airlines

Deal found 14/9£397

Sat 20/906:50LHR - ORD

1 stop11h 15mUnited Airlines

Sun 21/921:50ORD - LHR

Nonstop7h 55mUnited Airlines

Deal found 12/9£403

Sun 21/914:00LGW - ORD

2 stops29h 12mMultiple Airlines

Sat 4/1008:00ORD - LGW

1 stop20h 00mMultiple Airlines

Deal found 14/9£402

Mon 22/914:00LGW - ORD

1 stop32h 12mMultiple Airlines

Sun 5/1006:00ORD - LGW

1 stop22h 10mMultiple Airlines

Deal found 15/9£395

Mon 22/912:15LHR - ORD

Nonstop8h 35mBritish Airways

Mon 29/920:40ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 14/9£398

Tue 23/912:15LHR - ORD

Nonstop8h 35mBritish Airways

Fri 3/1022:35ORD - LHR

Nonstop7h 40mBritish Airways

Deal found 13/9£397

Tue 23/912:15LHR - ORD

Nonstop8h 35mBritish Airways

Sun 5/1017:40ORD - LHR

Nonstop7h 40mBritish Airways

Deal found 14/9£399

Tue 23/914:10LHR - ORD

Nonstop8h 35mBrussels Airlines

Tue 30/916:00ORD - LHR

Nonstop8h 20mBrussels Airlines

Deal found 15/9£400

Tue 23/907:30LHR - ORD

2 stops16h 51mLufthansa

Tue 30/922:30ORD - LHR

1 stop12h 10mLufthansa

Deal found 15/9£402

Wed 24/908:50LGW - ORD

2 stops15h 25mMultiple Airlines

Wed 1/1019:25ORD - LGW

2 stops16h 25mMultiple Airlines

Deal found 14/9£400

Wed 24/908:15STN - ORD

2 stops19h 00mMultiple Airlines

Wed 1/1019:25ORD - STN

2 stops21h 05mMultiple Airlines

Deal found 14/9£400

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 15 September 2025.

Thu 30/1016:00LGW - MDW

3 stops49h 37mMultiple Airlines

Deal found 15/9£399

Fri 10/1014:00LGW - ORD

1 stop31h 39mMultiple Airlines

Deal found 14/9£399

Tue 23/913:10LTN - ORD

1 stop11h 50mMultiple Airlines

Deal found 15/9£399

Tue 23/912:15STN - ORD

1 stop12h 45mMultiple Airlines

Deal found 15/9£399

Sat 20/910:00LGW - MDW

3 stops27h 11mMultiple Airlines

Deal found 15/9£400

Mon 27/1020:05LHR - ORD

2 stops48h 55mMultiple Airlines

Deal found 15/9£400

Fri 19/1205:50LTN - ORD

1 stop18h 05mMultiple Airlines

Deal found 13/9£400

Mon 6/1021:30STN - ORD

3 stops45h 15mMultiple Airlines

Deal found 15/9£400

Thu 15/109:50LHR - MDW

3 stops38h 18mMultiple Airlines

Deal found 14/9£400

Thu 30/1006:00LHR - STL

3 stops43h 12mMultiple Airlines

Deal found 13/9£400

Sat 13/1208:15LGW - ORD

2 stops15h 40mMultiple Airlines

Deal found 15/9£400

Tue 7/1013:25LHR - ORD

2 stops29h 20mMultiple Airlines

Deal found 15/9£400

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 9/12

07:05-16:45

2 stops39h 40m

Chicago O'Hare Intl

Fri 9/1

19:20-16:00

1 stop14h 40m

£396

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 1/10

07:45-16:35

2 stops14h 50m

Chicago O'Hare Intl

Sun 12/10

14:08-09:35

1 stop13h 27m

£397

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 15/12

12:15-17:20

1 stop11h 05m

Chicago O'Hare Intl

Thu 15/1

18:30-19:30

1 stop19h 00m

£398

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 13/12

20:35-17:20

1 stop26h 45m

Chicago O'Hare Intl

Thu 8/1

18:30-19:30

1 stop19h 00m

£400

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 26/9

06:50-12:05

1 stop11h 15m

Chicago O'Hare Intl

Sun 28/9

21:25-11:45

Nonstop8h 20m

£403

LondonChicago

LTN - ORD

LTNORD

London Luton

Wed 15/10

10:00-19:00

1 stop15h 00m

Chicago O'Hare Intl

Wed 22/10

21:15-20:45

1 stop17h 30m

£407

LondonChicago

LGW - MDW

LGWMDW

London Gatwick

Fri 26/9

14:00-09:51

1 stop25h 51m

Chicago Midway

Mon 29/9

08:19-10:00

1 stop19h 41m

£408

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 27/9

08:30-11:30

Nonstop9h 00m

Chicago O'Hare Intl

Mon 6/10

18:00-08:20

Nonstop8h 20m

£413

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 30/10

13:35-18:00

Nonstop9h 25m

Chicago O'Hare Intl

Thu 6/11

17:50-07:55

Nonstop8h 05m

£414

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 11/2

13:35-17:00

Nonstop9h 25m

Chicago O'Hare Intl

Tue 24/2

21:05-11:15

Nonstop8h 10m

£414

Flights are sorted by cheapest return flights first.

Deals found on 13/9

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, January is the cheapest month in which you can book a flight from London to Illinois (average of £595). Flying from London to Illinois in July is currently the most expensive (average of £843). 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?

When flying from London to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from London to Illinois

The most flights from LON to USIL are scheduled on a Sunday (54 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (42 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

1,323 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

1,323 reviews

Finnair

7.6

Good

1,323 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

Aer Lingus

7.2

Good

1,270 reviews

Finnair

7.6

Good

1,323 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

Icelandair

7.0

Good

544 reviews

Finnair

7.6

Good

1,323 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

Lufthansa

6.8

Okay

7,407 reviews

Finnair

7.6

Good

1,323 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

British Airways

6.7

Okay

7,361 reviews

Finnair

7.6

Good

1,323 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 05m. Fly via Scandinavian Airlines, United Airlines, or Icelandair to get the fastest option. Airlines will cover a distance of 3939 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 £400. Users have also found prices from £405 and £407 on Virgin Atlantic and Brussels Airlines, 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 (75%), Austrian Airlines (75%), United Airlines( 75%).
What are the cheapest flights from London to Illinois?
Looking for the cheapest flight from London to Illinois? While on average our users pay £802, our data indicates the cheapest price to be £410. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £330.
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, January is the cheapest month in which you can book a flight from London to Illinois (average of £595). Flying from London to Illinois in July is currently the most expensive (average of £843). 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

Heathrow to LaGuardia flights

Gatwick to Newark flights

London City to John F Kennedy Intl flights

Gatwick to John F Kennedy Intl flights

Gatwick to LaGuardia flights

London City to Newark flights

Heathrow to Miami flights

Heathrow to Orlando flights

Stansted to John F Kennedy Intl flights

Heathrow to Los Angeles flights

Luton to John F Kennedy Intl flights

Heathrow to Boston flights

Stansted to Newark flights

Manchester to John F Kennedy Intl flights

Heathrow to San Francisco flights

London City to LaGuardia flights

Luton to Newark flights

Heathrow to Dallas/Fort Worth flights

Heathrow to O'Hare Intl flights

Heathrow to Dulles Intl flights

Heathrow to Las Vegas flights

Gatwick to Orlando flights

Heathrow to Baltimore flights

Manchester to Orlando flights

Heathrow to Seattle flights

London City to Miami flights

Heathrow to Tampa flights

Manchester to Newark flights

Gatwick to Miami flights

London City to Orlando flights

Manchester to LaGuardia flights

Heathrow to Atlanta flights

Heathrow to Hobby flights

London City to Los Angeles flights

Edinburgh to Newark flights

London City to Boston flights

Heathrow to George Bush Intcntl flights

Gatwick to Los Angeles flights

Gatwick to Boston flights

Heathrow to Sky Harbor Intl flights

Gatwick to Las Vegas flights

Gatwick to San Francisco flights

Edinburgh to John F Kennedy Intl flights

Gatwick to O'Hare Intl flights

Heathrow to Midway flights

Stansted to Miami flights

Heathrow to Austin flights

Heathrow to Reagan-National 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

Champaign University-Willard Airport car hire

Springfield Capital Airport car hire

Chicago Greater Rockford 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£308	Average£480	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Scandinavian Airlines	Cheapest£350	Average£478	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
TAP AIR PORTUGAL	Cheapest£364	Average£608	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
Aer Lingus	Cheapest£364	Average£568	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Virgin Atlantic	Cheapest£376	Average£533	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Brussels Airlines	Cheapest£389	Average£546	FlexibilityNo cancel fee	On-timeN/A	Search Brussels Airlines flights
Lufthansa	Cheapest£391	Average£570	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Austrian Airlines	Cheapest£397	Average£566	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights
British Airways	Cheapest£400	Average£555	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
United Airlines	Cheapest£404	Average£670	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.

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

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

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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 £307

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 1/11. 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 15 September 2025.

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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 15 September 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 15 September 2025.

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Best time to book a flight from London to Illinois

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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 15 September 2025.

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 15 September 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?

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Alternative routes for London to Illinois

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Top 10 airlines flying from London to Illinois

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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 15 September 2025.