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$388+ Cheap flights from the United Kingdom to Illinois

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 12/16. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
1 adult, Economy
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Find flight deals from United Kingdom to Illinois

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 November 13, 2025.

This Mytrip deal was found by Cheapflights users on 11/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/37:45 amGLA - ORD
2 stops15h 35mMultiple Airlines
Sun 12/76:30 pmORD - GLA
2 stops22h 40mMultiple Airlines
Deal found 11/11$528
This Kiwi.com deal was found by Cheapflights users on 11/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/204:00 pmLGW - ORD
1 stop29h 25mTAP AIR PORTUGAL
Sun 11/308:25 pmORD - LGW
1 stop13h 20mTAP AIR PORTUGAL
Deal found 11/12$544
This Cheapflightsfares deal was found by Cheapflights users on 11/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2510:20 amLHR - ORD
1 stop12h 25mScandinavian Airlines
Wed 12/317:20 pmORD - LHR
1 stop14h 40mScandinavian Airlines
Deal found 11/11$545
This Booking.com deal was found by Cheapflights users on 11/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/610:20 amLHR - ORD
1 stop12h 25mScandinavian Airlines
Mon 12/87:20 pmORD - LHR
2 stops15h 05mScandinavian Airlines
Deal found 11/11$546
This Gotogate deal was found by Cheapflights users on 11/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2611:55 amLGW - ORD
1 stop11h 25mIcelandair
Tue 12/96:30 pmORD - LGW
1 stop10h 25mIcelandair
Deal found 11/11$548
This Gotogate deal was found by Cheapflights users on 11/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/168:35 pmLHR - ORD
1 stop26h 45mIcelandair
Tue 1/66:30 pmORD - LHR
1 stop19h 00mIcelandair
Deal found 11/13$548
This Mytrip deal was found by Cheapflights users on 11/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/259:00 amLTN - ORD
2 stops14h 20mMultiple Airlines
Tue 12/26:30 pmORD - LTN
2 stops19h 35mMultiple Airlines
Deal found 11/11$548
This oojo deal was found by Cheapflights users on 11/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/146:40 amLHR - ORD
2 stops16h 05mScandinavian Airlines
Fri 1/97:20 pmORD - LHR
2 stops17h 10mScandinavian Airlines
Deal found 11/11$549
This Kiwi.com deal was found by Cheapflights users on 11/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/42:00 pmLGW - ORD
1 stop30h 21mMultiple Airlines
Sat 12/62:26 pmORD - LGW
1 stop13h 39mMultiple Airlines
Deal found 11/11$550
This Gotogate deal was found by Cheapflights users on 11/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1011:55 amLGW - ORD
1 stop11h 25mIcelandair
Mon 12/156:30 pmORD - LGW
1 stop10h 25mIcelandair
Deal found 11/12$551
This Gotogate deal was found by Cheapflights users on 11/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/188:35 pmLHR - ORD
1 stop26h 45mIcelandair
Thu 12/46:30 pmORD - LHR
1 stop19h 00mIcelandair
Deal found 11/12$551
This Mytrip deal was found by Cheapflights users on 11/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/49:00 amLTN - ORD
2 stops14h 20mMultiple Airlines
Wed 12/106:30 pmORD - LTN
2 stops22h 35mMultiple Airlines
Deal found 11/13$551

Cheap 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 November 13, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$516
(Netflights)

One-way from

$388
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$618

Good round-trip deal

$794 or less

Good one-way deal

$627 or less
Provider with most accurate pricing for London (LON)-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for London (LON)-Chicago (CHI) flights.
Search Deals
From United Kingdom to Illinois
Search Deals
One-way flight from United Kingdom to Illinois
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($107 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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

 
Customize 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 2,558,603 searches. Data last updated November 13, 2025.
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

GlasgowChicago

GLA - ORD

GLAORD

Glasgow Intl

Thu 2/26

12:35 pm-5:20 pm

1 stop10h 45m

Chicago O'Hare Intl

Mon 3/2

6:30 pm-9:55 am

1 stop9h 25m

$524

LondonChicago

LTN - ORD

LTNORD

London Luton

Tue 11/25

9:00 am-5:20 pm

2 stops14h 20m

Chicago O'Hare Intl

Tue 12/2

6:30 pm-8:05 pm

2 stops19h 35m

$548

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 1/15

7:05 am-4:45 pm

2 stops15h 40m

Chicago O'Hare Intl

Sun 1/25

7:10 pm-4:25 pm

2 stops15h 15m

$550

LondonChicago

STN - ORD

STNORD

London Stansted

Tue 11/25

6:30 am-5:55 pm

1 stop17h 25m

Chicago O'Hare Intl

Tue 12/2

3:50 pm-7:50 am

1 stop10h 00m

$559

LondonChicago

STN - ORD

STNORD

London Stansted

Wed 12/3

6:30 am-2:00 pm

1 stop13h 30m

Chicago O'Hare Intl

Wed 12/10

3:50 pm-7:50 am

1 stop10h 00m

$559

LondonChicago

LTN - ORD

LTNORD

London Luton

Wed 11/26

6:50 am-5:55 pm

1 stop17h 05m

Chicago O'Hare Intl

Sun 11/30

7:40 pm-11:45 am

1 stop10h 05m

$560

LondonChicago

STN - ORD

STNORD

London Stansted

Wed 11/26

6:30 am-2:00 pm

1 stop13h 30m

Chicago O'Hare Intl

Sun 11/30

7:40 pm-6:20 pm

1 stop16h 40m

$560

LondonChicago

LTN - ORD

LTNORD

London Luton

Thu 12/4

6:50 am-5:55 pm

2 stops17h 05m

Chicago O'Hare Intl

Thu 12/11

3:50 pm-11:00 pm

2 stops25h 10m

$562

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 12/6

6:40 am-4:45 pm

1 stop16h 05m

Chicago O'Hare Intl

Sun 12/7

7:20 pm-6:30 pm

1 stop17h 10m

$563

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 12/14

8:35 pm-5:20 pm

1 stop26h 45m

Chicago O'Hare Intl

Tue 1/6

6:30 pm-7:30 pm

1 stop19h 00m

$593

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

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 round-trip 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, September is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of $204). Flying from United Kingdom to Illinois in July is currently the most expensive (average of $626). 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 November 13, 2025.

A simple way to save on the total cost of your ticket is to fly from United Kingdom to Illinois in the evening. If you’re flexible enough to do this you can expect to save up to 23% on your trip compared to booking a flight in the morning.

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 November 13, 2025.

The most flights from GB0 to USIL are scheduled on a Thursday (42 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (30 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 November 13, 2025.
Read reviews from past customers who have flown United Airlines, American Airlines, and Aer Lingus from the United Kingdom to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,017 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Overall

7.4

Food

6.6

Crew

8.1

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
9,017 reviews
United Airlines
7.4
Good
9,017 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Overall

7.4

Food

6.6

Crew

8.1

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.
American Airlines
7.2
Good
11,051 reviews
United Airlines
7.4
Good
9,017 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Overall

7.4

Food

6.6

Crew

8.1

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
1,370 reviews
United Airlines
7.4
Good
9,017 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Overall

7.4

Food

6.6

Crew

8.1

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
578 reviews
United Airlines
7.4
Good
9,017 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Overall

7.4

Food

6.6

Crew

8.1

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
7,517 reviews
United Airlines
7.4
Good
9,017 reviews

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Overall

7.4

Food

6.6

Crew

8.1

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?

    Departing from United Kingdom to Illinois will take you 9h 20m. Airlines will cover a distance of 3939 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    $488 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Lufthansa and Aer Lingus, with prices starting from $505 and $535, 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 vacation 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, September is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of $204). Flying from United Kingdom to Illinois in July is currently the most expensive (average of $626). 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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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 2,558,603 searches. Data last updated November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$390Average$625FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$446Average$791FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$485Average$788FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$530Average$897FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$531Average$776FlexibilityNo cancel feeOn-time70%
TAP AIR PORTUGALCheapest$558Average$789FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$572Average$803FlexibilityNo cancel feeOn-time71%
IberiaCheapest$599Average$794FlexibilityNo cancel feeOn-time77%
FinnairCheapest$625Average$809FlexibilityNo cancel feeOn-time76%
Brussels AirlinesCheapest$633Average$832FlexibilityNo cancel feeOn-timeN/A

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