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

For one-way options, check prices for WestJet. According to our data, you can fly for as low as £356. Users have also found prices from £384 and £391 on Icelandair and Air Transat, 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 cheapest flights from London to Illinois?

Looking for the cheapest flight from London to Illinois? While on average our users pay £1,146, our data indicates the cheapest price to be £438. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £350.

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 (91%), Austrian Airlines (91%), United Airlines( 91%).

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, Air Canada or Finnair 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 45 days in advance, which can save you up to 19% on flights from London to Illinois compared to booking the week you need them. Waiting 45 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 £541. For sooner than that we have options available in the next 3 days from £643.

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 £563 per person but you can even find prices for as low as £337. The most expensive prices can be found in the month of August. Opting for a February flight can save you 25% on your journey compared to booking in August

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.

£255+ Flights from London to Illinois

Cheap flight deals from London to Illinois

Round-trip from	£417
One-way from	£255
Popular in	August
Cheapest in	February
Average price	£459
Good round-trip deal	£552 or less
Good one-way deal	£570 or less

Austrian Airlines
23/4-29/4
1 total stop
20h 25m total
London to Illinois

Search Deals

6/3
1 total stop
15h 49m total
London to Illinois

Search Deals

Highest demand for flights based on searches. 12% potential increase in price (£61 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).

Search Deals

Average for round-trip flights in February 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 21 February 2025.

Fri 28/206:50LHR - ORD

1 stop11h 25mLufthansa

Thu 3/412:55ORD - LHR

1 stop11h 00mLufthansa

Deal found 20/2£417

Wed 23/408:40LHR - ORD

1 stop13h 15mUnited Airlines

Wed 30/421:20ORD - LHR

Nonstop8h 25mUnited Airlines

Deal found 21/2£418

Thu 6/314:00LGW - ORD

1 stop15h 28mMultiple Airlines

Tue 25/321:01ORD - LGW

2 stops30h 04mMultiple Airlines

Deal found 20/2£421

Fri 21/206:00LHR - ORD

1 stop15h 30mTAP AIR PORTUGAL

Fri 28/220:20ORD - LHR

1 stop16h 35mTAP AIR PORTUGAL

Deal found 20/2£423

Thu 6/306:00LHR - ORD

1 stop12h 55mSWISS

Tue 18/320:05ORD - LHR

1 stop11h 55mSWISS

Deal found 20/2£425

Sat 1/314:10LHR - ORD

Nonstop8h 50mBritish Airways

Tue 18/321:15ORD - LHR

Nonstop7h 45mBritish Airways

Deal found 20/2£425

Thu 20/306:30LHR - MDW

2 stops16h 32mKLM

Thu 27/314:55MDW - LHR

1 stop10h 55mKLM

Deal found 20/2£429

Wed 23/411:05LHR - ORD

Nonstop8h 45mFinnair

Tue 29/416:55ORD - LHR

Nonstop7h 55mFinnair

Deal found 20/2£429

Tue 22/414:45STN - ORD

2 stops33h 35mMultiple Airlines

Mon 28/419:30ORD - STN

2 stops19h 30mMultiple Airlines

Deal found 21/2£430

Thu 27/215:55LGW - ORD

1 stop29h 35mTAP AIR PORTUGAL

Wed 2/418:00ORD - LGW

1 stop14h 00mTAP AIR PORTUGAL

Deal found 20/2£432

Thu 1/513:05LHR - ORD

1 stop11h 15mIcelandair

Thu 22/519:25ORD - LHR

1 stop10h 30mIcelandair

Deal found 21/2£432

Tue 13/513:00LGW - ORD

1 stop11h 15mIcelandair

Thu 22/519:25ORD - LGW

1 stop13h 15mIcelandair

Deal found 21/2£433

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 21 February 2025.

Wed 23/406:00LHR - ORD

1 stop12h 10mMultiple Airlines

Tue 29/416:05ORD - LHR

Nonstop8h 15mMultiple Airlines

Deal found 20/2£417

Wed 23/408:40LHR - ORD

1 stop13h 15mUnited Airlines

Wed 30/421:20ORD - LHR

Nonstop8h 25mUnited Airlines

Deal found 21/2£418

Thu 6/306:50LHR - ORD

1 stop11h 25mLufthansa

Mon 10/318:50ORD - LHR

Nonstop8h 05mLufthansa

Deal found 21/2£421

Thu 6/306:00LHR - ORD

1 stop12h 55mSWISS

Tue 18/320:05ORD - LHR

1 stop11h 55mSWISS

Deal found 20/2£425

Tue 11/308:55LHR - ORD

2 stops15h 42mAir Canada

Sat 29/314:05ORD - LHR

2 stops13h 55mAir Canada

Deal found 21/2£425

Wed 5/311:55LHR - ORD

Nonstop8h 50mBritish Airways

Sun 9/321:15ORD - LHR

Nonstop7h 45mBritish Airways

Deal found 20/2£427

Thu 20/306:30LHR - MDW

2 stops16h 32mKLM

Thu 27/314:55MDW - LHR

1 stop10h 55mKLM

Deal found 20/2£429

Wed 23/411:05LHR - ORD

Nonstop8h 45mFinnair

Tue 29/416:55ORD - LHR

Nonstop7h 55mFinnair

Deal found 20/2£429

Wed 7/513:05LHR - ORD

1 stop14h 10mIcelandair

Wed 8/1019:25ORD - LHR

1 stop10h 30mIcelandair

Deal found 20/2£430

Mon 24/313:35LHR - ORD

Nonstop9h 25mBrussels Airlines

Tue 1/421:20ORD - LHR

Nonstop8h 25mBrussels Airlines

Deal found 20/2£433

Tue 4/321:20LGW - ORD

2 stops24h 10mTAP AIR PORTUGAL

Wed 26/320:15ORD - LGW

1 stop32h 35mTAP AIR PORTUGAL

Deal found 20/2£440

Thu 20/309:10LHR - MDW

1 stop14h 08mAir France

Thu 27/314:55MDW - LHR

1 stop10h 55mAir France

Deal found 20/2£442

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 21 February 2025.

Mon 10/310:25LHR - ORD

Nonstop9h 25mLufthansa

Sun 16/318:50ORD - LHR

Nonstop8h 05mLufthansa

Deal found 20/2£419

Fri 14/313:50LHR - ORD

Nonstop8h 50mBritish Airways

Mon 17/319:30ORD - LHR

Nonstop7h 45mBritish Airways

Deal found 21/2£424

Wed 12/310:25LHR - ORD

Nonstop9h 25mAustrian Airlines

Wed 26/318:50ORD - LHR

Nonstop8h 05mAustrian Airlines

Deal found 20/2£425

Wed 23/411:05LHR - ORD

Nonstop8h 45mFinnair

Tue 29/416:55ORD - LHR

Nonstop7h 55mFinnair

Deal found 20/2£429

Mon 24/313:35LHR - ORD

Nonstop9h 25mBrussels Airlines

Tue 1/421:20ORD - LHR

Nonstop8h 25mBrussels Airlines

Deal found 20/2£433

Thu 6/310:25LHR - ORD

Nonstop9h 25mUnited Airlines

Tue 18/318:50ORD - LHR

Nonstop8h 05mUnited Airlines

Deal found 20/2£443

Mon 3/315:45LHR - ORD

Nonstop9h 00mAmerican Airlines

Tue 25/321:15ORD - LHR

Nonstop7h 45mAmerican Airlines

Deal found 20/2£458

Sat 8/313:35LHR - ORD

Nonstop9h 25mMultiple Airlines

Wed 12/318:50ORD - LHR

Nonstop8h 05mMultiple Airlines

Deal found 21/2£498

Wed 4/611:05LHR - ORD

Nonstop8h 45mIberia

Sun 8/616:55ORD - LHR

Nonstop7h 55mIberia

Deal found 20/2£634

Last-minute flights from London to Illinois
Discover last-minute flight deals from London to Illinois. Data last updated 21 February 2025 and is based on user searches.

Fri 21/206:00LHR - ORD

1 stop15h 30mTAP AIR PORTUGAL

Fri 28/220:20ORD - LHR

1 stop16h 35mTAP AIR PORTUGAL

Deal found 20/2£423

Tue 25/220:40LHR - ORD

1 stop26h 40mIcelandair

Mon 3/318:30ORD - LHR

1 stop19h 00mIcelandair

Deal found 20/2£421

Wed 26/211:55LHR - ORD

Nonstop8h 50mFinnair

Wed 5/316:16ORD - LHR

1 stop10h 19mFinnair

Deal found 19/2£431

Thu 27/219:55LHR - ORD

1 stop25h 35mTAP AIR PORTUGAL

Wed 2/418:00ORD - LHR

1 stop12h 45mTAP AIR PORTUGAL

Deal found 20/2£418

Thu 27/215:55LGW - ORD

1 stop29h 35mTAP AIR PORTUGAL

Wed 2/418:00ORD - LGW

1 stop14h 00mTAP AIR PORTUGAL

Deal found 20/2£432

Fri 28/206:50LHR - ORD

1 stop11h 25mLufthansa

Thu 3/416:05ORD - LHR

Nonstop8h 15mLufthansa

Deal found 20/2£417

Fri 28/214:00LGW - ORD

1 stop26h 37mMultiple Airlines

Wed 12/308:50ORD - LGW

2 stops18h 15mMultiple Airlines

Deal found 20/2£440

Fri 28/212:20LHR - MDW

1 stop11h 51mVirgin Atlantic

Thu 3/414:57MDW - LHR

1 stop11h 58mVirgin Atlantic

Deal found 20/2£443

Fri 28/206:50LHR - ORD

1 stop11h 25mLufthansa

Fri 7/321:38ORD - LHR

1 stop30h 02mLufthansa

Deal found 21/2£417

Sat 1/314:10LHR - ORD

Nonstop8h 50mBritish Airways

Tue 18/321:15ORD - LHR

Nonstop7h 45mBritish Airways

Deal found 20/2£425

Sat 1/318:00LHR - ORD

1 stop22h 04mAir Canada

Mon 17/315:35ORD - LHR

1 stop10h 35mAir Canada

Deal found 21/2£441

Sat 1/309:10LHR - MDW

1 stop14h 33mKLM

Tue 18/314:55MDW - LHR

1 stop10h 55mKLM

Deal found 20/2£442

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 21 February 2025.

Thu 6/314:00LGW - STL

1 stop15h 49mMultiple Airlines

Deal found 20/2£255

Wed 19/315:15LHR - ORD

3 stops46h 14mMultiple Airlines

Deal found 20/2£318

Sat 1/314:00LGW - ORD

2 stops27h 42mMultiple Airlines

Deal found 20/2£321

Sat 1/322:30LGW - MDW

3 stops49h 03mMultiple Airlines

Deal found 19/2£322

Tue 15/405:55STN - ORD

3 stops55h 08mMultiple Airlines

Deal found 20/2£323

Sun 2/307:20LHR - MDW

2 stops40h 13mMultiple Airlines

Deal found 20/2£323

Wed 5/318:40LTN - ORD

2 stops49h 07mMultiple Airlines

Deal found 20/2£324

Wed 5/314:50LHR - ORD

1 stop31h 06mWestJet

Deal found 20/2£356

Tue 15/406:45LCY - MDW

3 stops28h 38mMultiple Airlines

Deal found 20/2£362

Tue 15/406:45LCY - ORD

3 stops29h 48mMultiple Airlines

Deal found 20/2£367

Fri 28/214:50LHR - STL

3 stops35h 02mMultiple Airlines

Deal found 20/2£374

Tue 6/513:00LGW - ORD

1 stop11h 15mIcelandair

Deal found 21/2£384

Find flights from London to Illinois within your budget

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 23/4

06:00-12:10

1 stop12h 10m

Chicago O'Hare Intl

Tue 29/4

16:05-06:20

Nonstop8h 15m

£417

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 23/4

08:40-15:55

1 stop13h 15m

Chicago O'Hare Intl

Wed 30/4

21:20-11:45

Nonstop8h 25m

£418

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 6/3

06:50-12:15

1 stop11h 25m

Chicago O'Hare Intl

Mon 10/3

18:50-07:55

Nonstop8h 05m

£421

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 6/3

14:00-23:28

1 stop15h 28m

Chicago O'Hare Intl

Tue 25/3

21:01-08:05

2 stops30h 04m

£421

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 6/3

06:00-12:55

1 stop12h 55m

Chicago O'Hare Intl

Tue 18/3

20:05-13:00

1 stop11h 55m

£425

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 11/3

08:55-19:37

2 stops15h 42m

Chicago O'Hare Intl

Sat 29/3

14:05-09:00

2 stops13h 55m

£425

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 5/3

11:55-14:45

Nonstop8h 50m

Chicago O'Hare Intl

Sun 9/3

21:15-10:00

Nonstop7h 45m

£427

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Thu 20/3

06:30-18:02

2 stops16h 32m

Chicago Midway

Thu 27/3

14:55-06:50

1 stop10h 55m

£429

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 7/5

13:05-21:15

1 stop14h 10m

Chicago O'Hare Intl

Wed 8/10

19:25-11:55

1 stop10h 30m

£430

LondonChicago

STN - ORD

STNORD

London Stansted

Tue 22/4

14:45-18:20

2 stops33h 35m

Chicago O'Hare Intl

Mon 28/4

19:30-21:00

2 stops19h 30m

£430

Flights are sorted by cheapest return flights first.

Deals found on 20/2

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.

Travel insights for flights from London to Illinois

Get recent, data-driven insights about flights from London to Illinois including ideal travel times, pricing trends, and more.

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 Wednesday (38 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (33 on average).

Rainfall in Illinois by month

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.

Temperature in Illinois by month

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).

Reviews of airlines servicing Illinois

To help decide which airline to fly from London to Illinois, see what other customers have to say about Delta, KLM and Air Transat. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

8,213 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta

8.0

Very Good

8,213 reviews

Delta

8.0

Very Good

8,213 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM

7.8

Good

1,331 reviews

Delta

8.0

Very Good

8,213 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Air Transat

7.8

Good

380 reviews

Delta

8.0

Very Good

8,213 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

LOT

7.6

Good

1,079 reviews

Delta

8.0

Very Good

8,213 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Finnair

7.6

Good

1,271 reviews

Delta

8.0

Very Good

8,213 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

What are the cheapest airlines to fly from London to Illinois one-way?
For one-way options, check prices for WestJet. According to our data, you can fly for as low as £356. Users have also found prices from £384 and £391 on Icelandair and Air Transat, 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 (91%), Austrian Airlines (91%), United Airlines( 91%).
What are the cheapest flights from London to Illinois?
Looking for the cheapest flight from London to Illinois? While on average our users pay £1,146, our data indicates the cheapest price to be £438. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £350.
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

London City to John F Kennedy Intl flights

Heathrow to LaGuardia flights

Gatwick to Newark flights

Gatwick to John F Kennedy Intl flights

London City to Newark flights

Stansted to Stewart flights

Heathrow to Orlando flights

Heathrow to Miami flights

Heathrow to Los Angeles flights

Heathrow to Las Vegas flights

Heathrow to O'Hare Intl flights

Heathrow to Boston flights

Heathrow to Dallas/Fort Worth flights

Luton to John F Kennedy Intl flights

Gatwick to LaGuardia flights

Heathrow to Dulles Intl flights

Heathrow to San Francisco flights

Stansted to John F Kennedy Intl flights

Gatwick to Orlando flights

Heathrow to Baltimore flights

Luton to Stewart flights

London City to Miami flights

Manchester to Orlando flights

Heathrow to Seattle flights

London City to Los Angeles flights

London City to Orlando flights

Manchester to John F Kennedy Intl flights

Heathrow to Atlanta flights

Heathrow to Hobby flights

Gatwick to Boston flights

Heathrow to Tampa flights

Gatwick to Miami flights

Heathrow to Nashville flights

Gatwick to Los Angeles flights

Luton to Newark flights

Heathrow to Austin flights

Manchester to Newark flights

London City to Boston flights

Manchester to LaGuardia flights

Heathrow to Denver flights

Heathrow to George Bush Intcntl flights

London City to Las Vegas flights

Gatwick to San Francisco flights

Gatwick to O'Hare Intl flights

London City to San Francisco flights

Heathrow to Midway flights

Heathrow to Charlotte flights

London City to O'Hare Intl 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

Chicago Greater Rockford Airport car hire

Champaign University-Willard 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£332	Average£511	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Scandinavian Airlines	Cheapest£376	Average£530	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
TAP AIR PORTUGAL	Cheapest£388	Average£585	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
Virgin Atlantic	Cheapest£417	Average£627	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
British Airways	Cheapest£425	Average£669	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Austrian Airlines	Cheapest£434	Average£599	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights
Lufthansa	Cheapest£437	Average£594	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£440	Average£624	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Aer Lingus	Cheapest£453	Average£595	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Finnair	Cheapest£473	Average£750	FlexibilityNo cancel fee	On-time76%	Search Finnair 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 £255

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 6/3. 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 21 February 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 21 February 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 21 February 2025.

Find flights from London to Illinois within your budget

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.

Travel insights for flights from London to Illinois

Get recent, data-driven insights about flights from London to Illinois including ideal travel times, pricing trends, and more.

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 21 February 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 21 February 2025.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

Reviews of airlines servicing Illinois

To help decide which airline to fly from London to Illinois, see what other customers have to say about Delta, KLM and Air Transat. Users can see the overall rating for each airline as well as how each is rated in terms of 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.

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

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

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 21 February 2025.