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 Lufthansa, United Airlines, or Icelandair 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 TAP AIR PORTUGAL. According to our data, you can fly for as low as £410. Users have also found prices from £411 and £412 on Scandinavian Airlines and Aer Lingus, 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 City - Chicago O'Hare Intl, 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 £1,443, our data indicates the cheapest price to be £418. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £328.

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 (73%), Austrian Airlines (73%), United Airlines( 73%).

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 £500. For sooner than that we have options available in the next 3 days from £668.

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 £516 per person but you can even find prices for as low as £318. The most expensive prices can be found in the month of July. Opting for a February flight can save you 24% 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.

£377+ Flights from London to Illinois

Q: How much does it cost for a return flight from London to Illinois?

Airfare is below average for this route at the moment. London to Illinois flights typically cost between £488 and £666 in September. The cheapest return flight price found within the last 3 days was £422 on United Airlines (13 Sept-5 Oct).

Cheap flight deals from London to Illinois

Round-trip from	£422
One-way from	£377
Popular in	July
Cheapest in	February
Average price	£623
Good round-trip deal	£495 or less
Good one-way deal	£554 or less

United Airlines
13/9-5/10
2 total stops
44h 37m total
London to Illinois

Search Deals

2/11
3 total stops
58h 02m 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 (£10 potential savings vs. average return price).

Search Deals

Average for round-trip flights in August 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 26 August 2025.

Sat 13/909:05LHR - ORD

1 stop34h 15mUnited Airlines

Sun 5/1021:25ORD - LHR

Nonstop8h 20mUnited Airlines

Deal found 25/8£422

Mon 1/907:25LHR - ORD

1 stop12h 40mUnited Airlines

Tue 30/911:45ORD - LHR

1 stop12h 10mUnited Airlines

Deal found 25/8£422

Sun 5/1014:45LGW - ORD

1 stop14h 06mAmerican Airlines

Sun 12/1013:43ORD - LGW

1 stop12h 07mAmerican Airlines

Deal found 23/8£423

Wed 3/907:40LHR - ORD

1 stop14h 05mAmerican Airlines

Sat 13/920:40ORD - LHR

Nonstop7h 50mAmerican Airlines

Deal found 24/8£423

Sat 20/910:45LTN - ORD

1 stop14h 15mMultiple Airlines

Sat 27/915:45ORD - LTN

1 stop11h 45mMultiple Airlines

Deal found 25/8£423

Sat 13/914:00LGW - MDW

1 stop25h 18mMultiple Airlines

Sat 20/910:51MDW - LGW

1 stop17h 09mMultiple Airlines

Deal found 25/8£424

Mon 8/914:00LGW - ORD

1 stop32h 12mMultiple Airlines

Fri 12/917:17ORD - LGW

1 stop34h 43mMultiple Airlines

Deal found 25/8£424

Sun 21/908:30LHR - ORD

1 stop12h 25mLufthansa

Thu 16/1018:00ORD - LHR

Nonstop8h 20mLufthansa

Deal found 24/8£424

Fri 3/1006:40STN - ORD

1 stop18h 20mMultiple Airlines

Sun 5/1015:45ORD - STN

1 stop12h 50mMultiple Airlines

Deal found 25/8£424

Wed 8/1014:00LGW - ORD

1 stop33h 27mMultiple Airlines

Sat 18/1018:40ORD - LGW

1 stop33h 30mMultiple Airlines

Deal found 23/8£425

Mon 1/908:30LHR - ORD

1 stop12h 25mUnited Airlines

Sun 14/921:50ORD - LHR

Nonstop7h 55mUnited Airlines

Deal found 25/8£425

Sun 14/906:50LHR - ORD

1 stop11h 15mUnited Airlines

Fri 3/1008:40ORD - LHR

1 stop15h 50mUnited Airlines

Deal found 25/8£425

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 26 August 2025.

Wed 26/1107:40LHR - ORD

1 stop12h 30mLufthansa

Fri 16/115:45ORD - LHR

Nonstop8h 10mLufthansa

Deal found 25/8£422

Thu 27/1107:40LHR - ORD

1 stop12h 30mMultiple Airlines

Sat 17/113:00ORD - LHR

1 stop11h 40mMultiple Airlines

Deal found 25/8£422

Sun 5/1007:30LHR - ORD

1 stop13h 25mUnited Airlines

Sun 12/1016:00ORD - LHR

Nonstop8h 20mUnited Airlines

Deal found 25/8£424

Mon 15/1211:55LGW - ORD

1 stop11h 25mIcelandair

Tue 30/1218:30ORD - LGW

1 stop10h 25mIcelandair

Deal found 25/8£425

Sun 5/1014:45LGW - ORD

1 stop14h 06mAmerican Airlines

Sun 12/1013:43ORD - LGW

1 stop12h 07mAmerican Airlines

Deal found 25/8£425

Sat 13/911:45LHR - MDW

1 stop12h 50mVirgin Atlantic

Sat 20/919:15MDW - LHR

1 stop11h 55mVirgin Atlantic

Deal found 23/8£433

Sat 6/1208:40LCY - ORD

1 stop13h 40mSWISS

Sun 7/1218:50ORD - LCY

1 stop12h 00mSWISS

Deal found 25/8£438

Mon 22/909:30LHR - STL

1 stop16h 27mAir Canada

Mon 29/916:05STL - LHR

1 stop13h 45mAir Canada

Deal found 25/8£604

Wed 24/919:30LHR - STL

2 stops31h 45mScandinavian Airlines

Thu 2/1013:26STL - LHR

2 stops20h 34mScandinavian Airlines

Deal found 25/8£606

Wed 26/1107:40LHR - ORD

1 stop12h 30mLufthansa

Sat 17/117:50ORD - LHR

Nonstop8h 05mLufthansa

Deal found 25/8£422

Wed 26/1107:40LHR - ORD

1 stop12h 30mMultiple Airlines

Fri 16/113:00ORD - LHR

1 stop11h 40mMultiple Airlines

Deal found 25/8£422

Sun 21/908:30LHR - ORD

1 stop12h 25mUnited Airlines

Thu 16/1014:39ORD - LHR

1 stop10h 16mUnited Airlines

Deal found 24/8£424

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 26 August 2025.

Tue 7/1008:30LHR - ORD

Nonstop9h 00mLufthansa

Tue 14/1021:25ORD - LHR

Nonstop8h 20mLufthansa

Deal found 23/8£426

Fri 3/1014:10LHR - ORD

Nonstop9h 10mLufthansa

Sun 5/1021:25ORD - LHR

Nonstop8h 20mLufthansa

Deal found 24/8£428

Mon 22/909:15LHR - ORD

Nonstop8h 35mBritish Airways

Mon 29/921:15ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 25/8£429

Fri 5/914:10LHR - ORD

Nonstop8h 35mBrussels Airlines

Thu 11/916:00ORD - LHR

Nonstop8h 20mBrussels Airlines

Deal found 25/8£431

Thu 6/1111:00LHR - ORD

Nonstop8h 50mBritish Airways

Wed 12/1118:45ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 23/8£432

Fri 19/912:15LHR - ORD

Nonstop8h 35mBritish Airways

Tue 30/921:15ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 24/8£433

Fri 19/913:10LHR - ORD

Nonstop8h 45mBritish Airways

Tue 23/922:35ORD - LHR

Nonstop7h 40mBritish Airways

Deal found 23/8£434

Thu 18/915:30LHR - ORD

Nonstop8h 45mBritish Airways

Mon 22/921:15ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 23/8£435

Fri 19/913:10LHR - ORD

Nonstop8h 45mBritish Airways

Mon 22/919:15ORD - LHR

Nonstop7h 55mBritish Airways

Deal found 24/8£436

Thu 11/911:05LHR - ORD

Nonstop9h 05mLufthansa

Sun 14/921:50ORD - LHR

Nonstop7h 55mLufthansa

Deal found 24/8£437

Last-minute flights from London to Illinois
Discover last-minute flight deals from London to Illinois. Data last updated 26 August 2025 and is based on user searches.

Sun 31/806:50LHR - ORD

1 stop11h 05mUnited Airlines

Sat 13/914:20ORD - LHR

1 stop10h 55mUnited Airlines

Deal found 24/8£426

Mon 1/907:25LHR - ORD

1 stop12h 40mUnited Airlines

Mon 29/914:39ORD - LHR

1 stop10h 16mUnited Airlines

Deal found 25/8£422

Mon 1/908:30LHR - ORD

1 stop12h 25mUnited Airlines

Sun 14/921:50ORD - LHR

Nonstop7h 55mUnited Airlines

Deal found 25/8£425

Mon 1/907:25LHR - ORD

1 stop12h 40mUnited Airlines

Thu 2/1014:00ORD - LHR

1 stop15h 50mUnited Airlines

Deal found 25/8£427

Wed 3/906:50LHR - ORD

1 stop11h 15mUnited Airlines

Sat 13/913:12ORD - LHR

1 stop12h 03mUnited Airlines

Deal found 23/8£423

Wed 3/915:35LGW - ORD

1 stop11h 40mIcelandair

Sat 4/1019:25ORD - LGW

1 stop13h 10mIcelandair

Deal found 25/8£426

Tue 9/910:00LTN - ORD

1 stop15h 00mMultiple Airlines

Sat 13/915:45ORD - LTN

1 stop11h 45mMultiple Airlines

Deal found 24/8£425

Sat 13/909:05LHR - ORD

1 stop34h 15mUnited Airlines

Sun 5/1021:25ORD - LHR

Nonstop8h 20mUnited Airlines

Deal found 25/8£422

Sat 13/914:00LGW - MDW

1 stop25h 18mMultiple Airlines

Sat 20/910:51MDW - LGW

1 stop17h 09mMultiple Airlines

Deal found 25/8£424

Sun 14/906:50LHR - ORD

1 stop11h 15mUnited Airlines

Fri 3/1008:40ORD - LHR

1 stop15h 50mUnited Airlines

Deal found 25/8£425

Sat 20/910:45LTN - ORD

1 stop14h 15mMultiple Airlines

Sat 27/915:45ORD - LTN

1 stop11h 45mMultiple Airlines

Deal found 25/8£423

Sun 21/908:30LHR - ORD

1 stop12h 25mUnited Airlines

Sun 28/910:45ORD - LHR

1 stop14h 10mUnited Airlines

Deal found 24/8£424

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 26 August 2025.

Sun 2/1105:00LHR - STL

3 stops58h 02mMultiple Airlines

Deal found 25/8£377

Mon 10/1114:50LHR - ORD

2 stops26h 24mMultiple Airlines

Deal found 25/8£408

Mon 3/1114:50LHR - MDW

2 stops26h 48mMultiple Airlines

Deal found 25/8£408

Wed 3/913:00LTN - ORD

1 stop12h 00mMultiple Airlines

Deal found 25/8£409

Wed 3/913:15STN - ORD

1 stop11h 45mMultiple Airlines

Deal found 25/8£409

Fri 10/1014:00LGW - MDW

1 stop31h 11mMultiple Airlines

Deal found 25/8£410

Sat 20/916:30LGW - ORD

1 stop29h 55mTAP AIR PORTUGAL

Deal found 25/8£410

Wed 1/1013:00LTN - ORD

1 stop12h 00mMultiple Airlines

Deal found 25/8£410

Fri 3/1008:15STN - ORD

1 stop16h 45mMultiple Airlines

Deal found 25/8£410

Thu 9/1019:50LHR - ORD

1 stop26h 20mTAP AIR PORTUGAL

Deal found 25/8£411

Fri 26/911:30LTN - ORD

1 stop13h 30mMultiple Airlines

Deal found 25/8£411

Thu 22/110:20LHR - ORD

1 stop12h 25mScandinavian Airlines

Deal found 25/8£411

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 26/11

07:40-14:10

1 stop12h 30m

Chicago O'Hare Intl

Fri 16/1

15:45-05:55

Nonstop8h 10m

£422

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 27/11

07:40-14:10

1 stop12h 30m

Chicago O'Hare Intl

Sat 17/1

13:00-06:40

1 stop11h 40m

£422

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 26/11

07:40-14:10

1 stop12h 30m

Chicago O'Hare Intl

Sat 17/1

17:50-07:55

Nonstop8h 05m

£422

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 26/11

07:40-14:10

1 stop12h 30m

Chicago O'Hare Intl

Fri 16/1

13:00-06:40

1 stop11h 40m

£422

LondonChicago

STN - ORD

STNORD

London Stansted

Thu 16/10

08:15-14:00

1 stop11h 45m

Chicago O'Hare Intl

Tue 21/10

21:15-16:35

1 stop13h 20m

£422

LondonChicago

LTN - ORD

LTNORD

London Luton

Sat 20/9

10:45-19:00

1 stop14h 15m

Chicago O'Hare Intl

Sat 27/9

15:45-09:30

1 stop11h 45m

£423

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 5/10

07:30-14:55

1 stop13h 25m

Chicago O'Hare Intl

Sun 12/10

16:00-06:20

Nonstop8h 20m

£424

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 21/9

08:30-14:55

1 stop12h 25m

Chicago O'Hare Intl

Thu 16/10

14:39-06:55

1 stop10h 16m

£424

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 21/9

08:30-14:55

1 stop12h 25m

Chicago O'Hare Intl

Thu 16/10

18:00-08:20

Nonstop8h 20m

£424

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 21/9

08:30-14:55

1 stop12h 25m

Chicago O'Hare Intl

Sun 28/9

16:00-06:20

Nonstop8h 20m

£424

Flights are sorted by cheapest return flights first.

Deals found on 25/8

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 Saturday (54 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (47 on average).

How much does it cost for a return flight from London to Illinois?

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

1,320 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

1,320 reviews

Finnair

7.6

Good

1,320 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

Aer Lingus

7.2

Good

1,237 reviews

Finnair

7.6

Good

1,320 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

Icelandair

7.0

Good

533 reviews

Finnair

7.6

Good

1,320 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

Lufthansa

6.8

Okay

7,359 reviews

Finnair

7.6

Good

1,320 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2025

FRA - DFW

British Airways

6.7

Okay

7,309 reviews

Finnair

7.6

Good

1,320 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 Lufthansa, United Airlines, or Icelandair 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 TAP AIR PORTUGAL. According to our data, you can fly for as low as £410. Users have also found prices from £411 and £412 on Scandinavian Airlines and Aer Lingus, respectively.
What are the most popular routes from London to Illinois?
While some choose either London Gatwick - Chicago O'Hare Intl or London City - Chicago O'Hare Intl, 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 (73%), Austrian Airlines (73%), United Airlines( 73%).
What are the cheapest flights from London to Illinois?
Looking for the cheapest flight from London to Illinois? While on average our users pay £1,443, our data indicates the cheapest price to be £418. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £328.
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

Gatwick to John F Kennedy Intl flights

Gatwick to Newark flights

London City to John F Kennedy Intl flights

London City to Newark flights

Heathrow to LaGuardia flights

Stansted to John F Kennedy Intl flights

Gatwick to LaGuardia flights

Luton to John F Kennedy Intl flights

Stansted to Newark flights

London City to LaGuardia flights

Luton to Newark flights

Heathrow to Los Angeles flights

Heathrow to Orlando flights

Heathrow to Miami flights

Heathrow to Boston flights

Heathrow to Dallas/Fort Worth flights

Manchester to John F Kennedy Intl flights

Heathrow to O'Hare Intl flights

Heathrow to San Francisco flights

Heathrow to Dulles Intl flights

Heathrow to Las Vegas flights

Gatwick to Orlando flights

Heathrow to Baltimore flights

Gatwick to Boston flights

Gatwick to Miami flights

Heathrow to Seattle flights

Manchester to Newark flights

Heathrow to Atlanta flights

Luton to LaGuardia flights

Manchester to Orlando flights

London City to Los Angeles flights

Manchester to LaGuardia flights

London City to Miami flights

London City to Orlando flights

Heathrow to Hobby flights

Heathrow to Austin flights

Heathrow to Tampa flights

Gatwick to San Francisco flights

Gatwick to O'Hare Intl flights

Gatwick to Las Vegas flights

Edinburgh to Newark flights

London City to San Francisco flights

Heathrow to Nashville flights

London City to O'Hare Intl flights

Gatwick to Dulles Intl flights

Edinburgh to John F Kennedy Intl flights

Heathrow to Reagan-National flights

Gatwick to Los Angeles 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

Springfield Capital Airport car hire

Champaign University-Willard Airport car hire

Chicago Greater Rockford Airport car hire

Belleville Airport car hire

Quincy Regional Airport car hire

Marion Williamson County Airport car hire

Direct flights to United States

Top 10 airlines flying from London to Illinois

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£311	Average£484	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Scandinavian Airlines	Cheapest£352	Average£478	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
TAP AIR PORTUGAL	Cheapest£367	Average£612	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
Aer Lingus	Cheapest£372	Average£572	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Virgin Atlantic	Cheapest£379	Average£552	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Brussels Airlines	Cheapest£392	Average£576	FlexibilityNo cancel fee	On-timeN/A	Search Brussels Airlines flights
Lufthansa	Cheapest£396	Average£577	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Austrian Airlines	Cheapest£402	Average£581	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights
British Airways	Cheapest£406	Average£568	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
United Airlines	Cheapest£407	Average£680	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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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 £377

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 2/11. 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 26 August 2025.

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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 26 August 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 26 August 2025.

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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.

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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 26 August 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 26 August 2025.

How much does it cost for a return flight from London to Illinois?

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 26 August 2025.