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Cheap flights from the United Kingdom to Illinois from £276

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 25/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
26 Feb — 5 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from United Kingdom to Illinois

Enter your travel dates to find the best prices.

Cheapest flights from United Kingdom to Illinois
Explore the most affordable flight options available from United Kingdom to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 January 2026.

Thu 5/314:00
LGW
-
ORD
1 stop25h 06m
Multiple Airlines
Sat 14/318:16
ORD
-
LGW
2 stops21h 24m
Multiple Airlines
Deal found 26/1£386
Thu 19/212:15
LHR
-
ORD
1 stop11h 05m
Icelandair
Mon 23/218:30
ORD
-
LHR
1 stop10h 20m
Icelandair
Deal found 25/1£386
Wed 18/313:00
LGW
-
MDW
1 stop29h 02m
Multiple Airlines
Mon 23/321:51
MDW
-
LGW
1 stop31h 09m
Multiple Airlines
Deal found 26/1£387
Fri 20/211:55
LGW
-
ORD
1 stop11h 25m
Icelandair
Mon 23/218:30
ORD
-
LGW
1 stop10h 25m
Icelandair
Deal found 25/1£387
Mon 2/212:15
LHR
-
ORD
1 stop11h 05m
Icelandair
Fri 6/218:30
ORD
-
LHR
1 stop10h 20m
Icelandair
Deal found 25/1£387
Wed 11/320:35
LHR
-
ORD
1 stop26h 45m
Icelandair
Tue 17/319:30
ORD
-
LHR
1 stop10h 20m
Icelandair
Deal found 26/1£388
Thu 26/216:00
LGW
-
ORD
1 stop29h 25m
TAP AIR PORTUGAL
Sun 1/320:25
ORD
-
LGW
1 stop13h 20m
TAP AIR PORTUGAL
Deal found 24/1£388
Sun 1/206:50
LHR
-
ORD
2 stops14h 05m
Air Canada
Sat 14/212:50
ORD
-
LHR
1 stop12h 20m
Air Canada
Deal found 25/1£388
Mon 23/211:55
LGW
-
ORD
1 stop11h 25m
Icelandair
Sat 28/218:30
ORD
-
LGW
1 stop10h 25m
Icelandair
Deal found 26/1£390
Mon 2/220:35
LHR
-
ORD
1 stop26h 45m
Icelandair
Sun 15/218:30
ORD
-
LHR
1 stop10h 20m
Icelandair
Deal found 26/1£390
Mon 9/208:50
LHR
-
ORD
2 stops17h 14m
British Airways
Sat 2/512:30
ORD
-
LHR
1 stop16h 25m
British Airways
Deal found 25/1£391
Sun 8/313:00
LGW
-
ORD
1 stop34h 29m
Multiple Airlines
Tue 24/318:36
ORD
-
LGW
2 stops34h 24m
Multiple Airlines
Deal found 26/1£391

Find flight deals from United Kingdom to Illinois

Keep the following information in mind while searching for United Kingdom to Illinois flight deals. Data was last updated 27 January 2026.

Round-trip from

£385

One-way from

£276

Popular in

July

Cheapest in

February

Average price

£456

Good round-trip deal

£483 or less

Good one-way deal

£443 or less
British Airways
  • British Airways
  • 10/2-17/2
  • 1 total stop
  • 20h 50m total
  • United Kingdom to Illinois
Search Deals
25/2
  • 25/2
  • 2 total stops
  • 33h 14m total
  • United Kingdom to Illinois
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (£63 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 January 2026
Search Deals
Price to beat on a round-trip flight from United Kingdom to Illinois.
Search Deals
Price to beat on a one-way flight from United Kingdom to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from United Kingdom 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 27 January 2026.
Use the filters below to find and compare flights from the United Kingdom to Illinois that are best for you.

Fly from

United Kingdom

Fly to

Illinois

Route

Depart

Return

Price

LondonChicago

LGW - MDW

LGWMDW

London Gatwick

Wed 18/3

13:00-13:02

1 stop29h 02m

Chicago Midway

Mon 23/3

21:51-10:00

1 stop31h 09m

£387

LondonChicago

LGW - MDW

LGWMDW

London Gatwick

Wed 18/3

13:00-13:02

1 stop29h 02m

Chicago Midway

Tue 24/3

07:30-10:00

2 stops21h 30m

£393

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Mon 9/2

11:55-17:20

1 stop11h 25m

Chicago O'Hare Intl

Mon 27/4

19:25-14:40

1 stop13h 15m

£402

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Mon 9/2

11:55-17:20

1 stop11h 25m

Chicago O'Hare Intl

Tue 28/4

19:25-14:40

1 stop13h 15m

£402

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 7/5

13:00-18:15

1 stop11h 15m

Chicago O'Hare Intl

Sun 17/5

22:25-14:40

1 stop10h 15m

£402

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 19/3

09:00-17:20

1 stop13h 20m

Chicago O'Hare Intl

Fri 27/3

15:55-05:35

1 stop32h 40m

£406

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 9/2

08:50-19:15

1 stop16h 25m

Chicago O'Hare Intl

Sat 2/5

19:05-09:05

Nonstop8h 00m

£407

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 9/2

08:50-19:15

1 stop16h 25m

Chicago O'Hare Intl

Sun 26/4

19:05-09:05

Nonstop8h 00m

£407

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Mon 9/2

11:55-17:20

1 stop11h 25m

Chicago O'Hare Intl

Sat 2/5

19:25-11:45

1 stop10h 20m

£407

LondonChicago

LCY - ORD

LCYORD

London City

Tue 24/2

09:15-16:20

1 stop13h 05m

Chicago O'Hare Intl

Tue 3/3

18:50-12:55

1 stop12h 05m

£410

Flights are sorted by cheapest return flights first.

Deals found on 25/1

Showing 1-10 of 60 results
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Best time to book a flight from United Kingdom to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from United Kingdom 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 the United Kingdom to Illinois

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

Currently, January is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of £67). Flying from United Kingdom to Illinois in July is currently the most expensive (average of £456). 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 GB to IL?

Find hourly flight availability from United Kingdom 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 27 January 2026.

When flying from United Kingdom 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 United Kingdom to Illinois

Explore weekly flight availability from United Kingdom 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 27 January 2026.

The most flights from GB0 to USIL are scheduled on a Tuesday (42 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (33 on average).

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 27 January 2026.
Read through reviews of airlines operating flights from the United Kingdom to Illinois, such as United Airlines, Aer Lingus, andIcelandair. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,206 reviews
Check prices

Comfort

7.3

Boarding

7.7

Overall

7.4

Entertainment

7.1

Crew

8.1

Food

6.6

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
9,206 reviews
United Airlines
7.4
Good
9,206 reviews
Check prices

Comfort

7.3

Boarding

7.7

Overall

7.4

Entertainment

7.1

Crew

8.1

Food

6.6

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
1,442 reviews
United Airlines
7.4
Good
9,206 reviews
Check prices

Comfort

7.3

Boarding

7.7

Overall

7.4

Entertainment

7.1

Crew

8.1

Food

6.6

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
603 reviews
United Airlines
7.4
Good
9,206 reviews
Check prices

Comfort

7.3

Boarding

7.7

Overall

7.4

Entertainment

7.1

Crew

8.1

Food

6.6

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
7,749 reviews
United Airlines
7.4
Good
9,206 reviews
Check prices

Comfort

7.3

Boarding

7.7

Overall

7.4

Entertainment

7.1

Crew

8.1

Food

6.6

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
7,702 reviews
United Airlines
7.4
Good
9,206 reviews
Check prices

Comfort

7.3

Boarding

7.7

Overall

7.4

Entertainment

7.1

Crew

8.1

Food

6.6

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 United Kingdom 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 United Kingdom to Illinois?

    A quick flight from United Kingdom to Illinois can take about 11h 25m. Icelandair provides one of the quickest options available for as low as £402. The distance between United Kingdom and Illinois is about 3960 mi. Both multi-stop and direct flights can be found to your destination and back.

  • What are the cheapest airlines to fly from United Kingdom to Illinois one-way?

    £287 is the cheapest one-way deal found within the past few days, from TAP AIR PORTUGAL. You may also be able to find cheap deals on JetBlue and Scandinavian Airlines, with prices starting from £305 and £312, respectively.

  • Can I find deals for flights from United Kingdom to Illinois that include hotel bookings?

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

  • How can I find direct flights from United Kingdom to Illinois?

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

  • Can I find deals for business class flights from United Kingdom to Illinois?

    Yes. Cheapflights offers flight deals from United Kingdom 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 United Kingdom to Illinois?

    Currently, January is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of £67). Flying from United Kingdom to Illinois in July is currently the most expensive (average of £456). 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

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Alternative routes for United Kingdom to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Stansted to Los Angeles flights
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Heathrow to Baltimore flights
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Heathrow to Ontario flights
Gatwick to San Francisco flights
Heathrow to Denver flights
Heathrow to Nashville flights
Stansted to Orlando flights
London City to Orlando flights
London City to Dallas/Fort Worth flights

Top 10 airlines flying from United Kingdom to Illinois

Discover the top 10 airlines that operate flights from United Kingdom 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 27 January 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£281Average£550FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
LufthansaCheapest£282Average£652FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£339Average£575FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Scandinavian AirlinesCheapest£353Average£455FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Aer LingusCheapest£359Average£698FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£372Average£551FlexibilityNo cancel feeOn-time70%
Search British Airways flights
TAP AIR PORTUGALCheapest£379Average£614FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Brussels AirlinesCheapest£379Average£529FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
Austrian AirlinesCheapest£392Average£595FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
United AirlinesCheapest£401Average£657FlexibilityNo 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 United Kingdom 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 United Kingdom today with Cheapflights!

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Illinois from United Kingdom.

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from United Kingdom to Illinois, users can toggle the no change fees filter when performing a flight search.

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

Yes, Cheapflights offers price alerts on United Kingdom to Illinois flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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