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Cheap flights from London to Illinois from £267

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 13/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ORD
25 Mar — 1 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap 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 23 February 2026.

Mon 13/415:40
LGW
-
ORD
1 stop32h 35m
Icelandair
Mon 27/419:25
ORD
-
LGW
1 stop10h 20m
Icelandair
Deal found 22/2£399
Tue 14/406:30
STN
-
ORD
3 stops34h 23m
Multiple Airlines
Tue 5/519:25
ORD
-
STN
3 stops20h 35m
Multiple Airlines
Deal found 21/2£400
Thu 26/218:30
LHR
-
ORD
1 stop26h 55m
TAP AIR PORTUGAL
Sun 22/321:25
ORD
-
LHR
1 stop15h 05m
TAP AIR PORTUGAL
Deal found 20/2£400
Fri 24/415:40
LGW
-
ORD
1 stop11h 45m
Icelandair
Thu 30/419:25
ORD
-
LGW
1 stop13h 15m
Icelandair
Deal found 21/2£401
Tue 10/318:30
LHR
-
ORD
1 stop26h 30m
TAP AIR PORTUGAL
Fri 20/321:15
ORD
-
LHR
1 stop15h 15m
TAP AIR PORTUGAL
Deal found 21/2£401
Mon 13/422:45
STN
-
ORD
2 stops25h 05m
Multiple Airlines
Mon 27/419:25
ORD
-
STN
3 stops20h 10m
Multiple Airlines
Deal found 22/2£401
Thu 12/318:30
LHR
-
ORD
1 stop26h 55m
TAP AIR PORTUGAL
Sun 22/321:25
ORD
-
LHR
1 stop19h 10m
TAP AIR PORTUGAL
Deal found 22/2£402
Tue 14/415:40
LGW
-
ORD
1 stop32h 35m
Icelandair
Tue 5/519:25
ORD
-
LGW
1 stop13h 15m
Icelandair
Deal found 21/2£403
Wed 11/306:00
LHR
-
ORD
1 stop15h 00m
TAP AIR PORTUGAL
Sun 22/321:25
ORD
-
LHR
1 stop15h 05m
TAP AIR PORTUGAL
Deal found 21/2£403
Wed 15/415:40
LGW
-
ORD
1 stop32h 35m
Icelandair
Sun 26/422:25
ORD
-
LGW
1 stop10h 15m
Icelandair
Deal found 19/2£404
Tue 14/406:30
STN
-
ORD
2 stops21h 33m
Multiple Airlines
Fri 17/419:25
ORD
-
STN
2 stops19h 05m
Multiple Airlines
Deal found 22/2£404
Mon 13/406:40
LHR
-
ORD
1 stop15h 30m
Scandinavian Airlines
Mon 27/419:15
ORD
-
LHR
1 stop17h 15m
Scandinavian Airlines
Deal found 21/2£406

Find flight deals from London to Illinois

Keep the following information in mind while searching for London to Illinois flight deals. Data was last updated 23 February 2026.

Round-trip from

£399

One-way from

£267

Popular in

July

Cheapest in

September

Average price

£436

Good round-trip deal

£516 or less

Good one-way deal

£421 or less
Icelandair
  • Icelandair
  • 13/4-27/4
  • 2 total stops
  • 42h 55m total
  • London to Illinois
Search Deals
13/5
  • 13/5
  • 1 total stop
  • 15h 19m total
  • London to Illinois
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (£58 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 February 2026
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

Cheapflights Fare Finder

 
Customise your flight search to find flights from London to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 23 February 2026.
Use the filters below to find and compare flights from London to Illinois that are best for you.

Fly from

London

Fly to

Illinois

Route

Depart

Return

Price

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sat 18/4

15:40-18:15

1 stop32h 35m

Chicago O'Hare Intl

Mon 27/4

19:25-11:45

1 stop10h 20m

£443

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 19/4

21:05-16:10

2 stops25h 05m

Chicago O'Hare Intl

Fri 24/4

19:15-18:30

2 stops17h 15m

£452

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 11/5

13:05-18:15

1 stop11h 10m

Chicago O'Hare Intl

Sun 31/1

18:30-10:50

1 stop10h 20m

£454

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 15/5

13:05-18:15

1 stop11h 10m

Chicago O'Hare Intl

Sun 31/1

18:30-10:50

1 stop10h 20m

£454

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 11/3

11:55-18:20

1 stop11h 25m

Chicago O'Hare Intl

Wed 18/3

19:30-10:55

1 stop10h 25m

£458

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sat 18/4

15:40-18:15

1 stop32h 35m

Chicago O'Hare Intl

Fri 24/4

22:25-14:40

1 stop10h 15m

£469

LondonChicago

LTN - ORD

LTNORD

London Luton

Wed 25/3

06:50-18:20

2 stops16h 30m

Chicago O'Hare Intl

Mon 30/3

19:25-15:45

2 stops14h 20m

£481

LondonChicago

STN - ORD

STNORD

London Stansted

Wed 3/6

07:00-17:50

2 stops16h 50m

Chicago O'Hare Intl

Mon 3/8

15:45-17:05

1 stop19h 20m

£481

LondonChicago

LTN - ORD

LTNORD

London Luton

Sat 11/4

18:15-16:00

2 stops27h 45m

Chicago O'Hare Intl

Sat 25/4

19:25-22:55

2 stops21h 30m

£481

LondonChicago

STN - ORD

STNORD

London Stansted

Wed 3/6

07:00-17:50

2 stops16h 50m

Chicago O'Hare Intl

Tue 4/8

15:45-09:50

1 stop12h 05m

£481

Flights are sorted by cheapest return flights first.

Deals found on 19/2

Showing 1-10 of 60 results
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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.
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, December is the cheapest month in which you can book a flight from London to Illinois (average of £217). Flying from London to Illinois in July is currently the most expensive (average of £499). 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?

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 23 February 2026.

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

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 23 February 2026.

The most flights from LON to USIL are scheduled on a Saturday (49 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (38 on average).

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

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated 23 February 2026.
Read reviews from past customers who have flown with United Airlines, Aer Lingus, andIcelandair from London to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,342 reviews
Check prices

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
United Airlines
7.4
Good
9,342 reviews
United Airlines
7.4
Good
9,342 reviews
Check prices

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Aer Lingus
7.2
Good
1,462 reviews
United Airlines
7.4
Good
9,342 reviews
Check prices

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Icelandair
7.1
Good
617 reviews
United Airlines
7.4
Good
9,342 reviews
Check prices

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Lufthansa
6.8
Okay
7,803 reviews
United Airlines
7.4
Good
9,342 reviews
Check prices

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
British Airways
6.7
Okay
7,759 reviews
United Airlines
7.4
Good
9,342 reviews
Check prices

Crew

8.1

Food

6.6

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

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?

    There are many flights that can get you from London to Illinois in 8h 55m. Fly via Icelandair, Scandinavian Airlines, or Austrian Airlines 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 JetBlue. According to our data, you can fly for as low as £309. Users have also found prices from £324 and £329 on Icelandair and British Airways, respectively.

  • What are the most popular routes from London to Illinois?

    While some choose either London Heathrow - Chicago Midway or London Gatwick - 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 (91%), United Airlines (91%), Brussels 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 £1,335, our data indicates the cheapest price to be £364. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £381.

  • 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, December is the cheapest month in which you can book a flight from London to Illinois (average of £217). Flying from London to Illinois in July is currently the most expensive (average of £499). 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

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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.
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Top 10 airlines flying from London to Illinois

Discover the top 10 airlines that operate flights from London to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 23 February 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£340Average£483FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£343Average£528FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Aer LingusCheapest£363Average£631FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Scandinavian AirlinesCheapest£368Average£491FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£384Average£610FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Brussels AirlinesCheapest£384Average£540FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
LufthansaCheapest£393Average£577FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£399Average£578FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Austrian AirlinesCheapest£400Average£609FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
United AirlinesCheapest£408Average£699FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

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?

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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