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$270+ 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 4/19. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
Feb 27 — Mar 61
Fri 2/27
Fri 3/6
1 adult, Economy
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Cheap 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 January 28, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/26. 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 3/52:00 pm
LGW
-
ORD
1 stop25h 06m
Multiple Airlines
Sat 3/146:16 pm
ORD
-
LGW
2 stops21h 24m
Multiple Airlines
Deal found 1/26$528
This Icelandair deal was found by Cheapflights users on 1/25. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/1912:15 pm
LHR
-
ORD
1 stop11h 05m
Icelandair
Mon 2/236:30 pm
ORD
-
LHR
1 stop10h 20m
Icelandair
Deal found 1/25$528
This oojo deal was found by Cheapflights users on 1/27. 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.
Wed 2/187:30 pm
LHR
-
ORD
1 stop27h 15m
Scandinavian Airlines
Mon 3/27:20 pm
ORD
-
LHR
2 stops17h 30m
Scandinavian Airlines
Deal found 1/27$529
This Icelandair deal was found by Cheapflights users on 1/27. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/118:35 pm
LHR
-
ORD
1 stop26h 45m
Icelandair
Wed 4/297:25 pm
ORD
-
LHR
1 stop10h 30m
Icelandair
Deal found 1/27$530
This Justfly.com deal was found by Cheapflights users on 1/27. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/54:00 pm
LGW
-
ORD
1 stop29h 25m
TAP AIR PORTUGAL
Wed 2/187:10 pm
ORD
-
LGW
1 stop13h 55m
TAP AIR PORTUGAL
Deal found 1/27$531
This Gotogate deal was found by Cheapflights users on 1/26. 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.
Mon 2/28:35 pm
LHR
-
ORD
1 stop26h 45m
Icelandair
Sun 2/156:30 pm
ORD
-
LHR
1 stop10h 20m
Icelandair
Deal found 1/26$531
This Icelandair deal was found by Cheapflights users on 1/27. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1111:55 am
LGW
-
ORD
1 stop11h 25m
Icelandair
Fri 5/110:25 pm
ORD
-
LGW
1 stop10h 15m
Icelandair
Deal found 1/27$533
This Norse deal was found by Cheapflights users on 1/27. 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 Norse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/262:00 pm
LGW
-
ORD
1 stop33h 46m
Multiple Airlines
Thu 3/510:44 am
ORD
-
LGW
1 stop17h 16m
Multiple Airlines
Deal found 1/27$534
This British Airways deal was found by Cheapflights users on 1/25. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/98:50 am
LHR
-
ORD
2 stops17h 14m
British Airways
Wed 4/294:16 pm
ORD
-
LHR
1 stop12h 19m
British Airways
Deal found 1/25$534
This FlightHub deal was found by Cheapflights users on 1/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/1811:55 am
LGW
-
ORD
1 stop11h 25m
Icelandair
Mon 3/26:30 pm
ORD
-
LGW
1 stop10h 25m
Icelandair
Deal found 1/27$535
This TravelUp deal was found by Cheapflights users on 1/27. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/188:05 pm
LHR
-
ORD
1 stop22h 40m
Multiple Airlines
Tue 2/243:45 pm
ORD
-
LHR
Nonstop8h 10m
Multiple Airlines
Deal found 1/27$535
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Mon 2/232:00 pm
LGW
-
ORD
1 stop31h 52m
Multiple Airlines
Sun 3/16:40 am
ORD
-
LGW
1 stop17h 20m
Multiple Airlines
Deal found 1/27$536

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 January 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$528
(Kiwi.com)

One-way from

$270
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$624

Good round-trip deal

$659 or less

Good one-way deal

$616 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. 14% potential increase in price ($119 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($17 potential savings vs. average RT 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

 
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 January 28, 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

LHR - ORD

LHRORD

London Heathrow

Thu 2/19

12:15 pm-5:20 pm

1 stop11h 05m

Chicago O'Hare Intl

Mon 2/23

6:30 pm-10:50 am

1 stop10h 20m

$528

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 2/9

8:50 am-8:04 pm

2 stops17h 14m

Chicago O'Hare Intl

Fri 5/1

5:00 pm-6:50 am

Nonstop7h 50m

$544

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 2/9

8:50 am-8:04 pm

2 stops17h 14m

Chicago O'Hare Intl

Mon 4/27

10:35 pm-12:15 pm

Nonstop7h 40m

$544

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 3/11

9:00 am-5:20 pm

1 stop13h 20m

Chicago O'Hare Intl

Wed 3/18

4:45 pm-5:55 am

Nonstop8h 10m

$548

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 3/4

12:10 pm-7:15 pm

1 stop13h 05m

Chicago O'Hare Intl

Tue 3/10

9:35 pm-10:25 am

Nonstop7h 50m

$548

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Mon 2/9

11:55 am-5:20 pm

1 stop11h 25m

Chicago O'Hare Intl

Tue 4/28

7:25 pm-2:40 pm

1 stop13h 15m

$549

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Mon 2/9

11:55 am-5:20 pm

1 stop11h 25m

Chicago O'Hare Intl

Sun 4/26

7:25 pm-2:40 pm

1 stop13h 15m

$549

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 3/13

9:05 am-3:00 pm

1 stop34h 55m

Chicago O'Hare Intl

Mon 3/16

10:05 pm-11:15 am

Nonstop8h 10m

$550

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 2/9

7:40 am-2:10 pm

1 stop12h 30m

Chicago O'Hare Intl

Thu 4/30

6:10 pm-8:30 am

Nonstop8h 20m

$553

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 2/10

7:40 am-2:10 pm

1 stop12h 30m

Chicago O'Hare Intl

Wed 3/4

9:15 pm-11:15 am

Nonstop8h 00m

$553

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

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, January is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of $91). Flying from United Kingdom to Illinois in July is currently the most expensive (average of $624). 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 January 28, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from United Kingdom to Illinois as you normally would.

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 January 28, 2026.

The most flights from GB0 to USIL are scheduled on a Wednesday (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 January 28, 2026.
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
9,212 reviews

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

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
9,212 reviews
United Airlines
7.4
Good
9,212 reviews

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

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.
American Airlines
7.2
Good
11,201 reviews
United Airlines
7.4
Good
9,212 reviews

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

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
1,442 reviews
United Airlines
7.4
Good
9,212 reviews

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

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
603 reviews
United Airlines
7.4
Good
9,212 reviews

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

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
7,704 reviews
United Airlines
7.4
Good
9,212 reviews

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

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 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 11h 05m. 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?

    $288 is the cheapest one-way deal found within the past few days, from Scandinavian Airlines. You may also be able to find cheap deals on Finnair and TAP AIR PORTUGAL, with prices starting from $351 and $381, 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, January is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of $91). Flying from United Kingdom to Illinois in July is currently the most expensive (average of $624). 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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Berlin to Newark flights
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Heathrow to Los Angeles flights
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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 January 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest$446Average$821FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$453Average$544FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$468Average$581FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$485Average$775FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$530Average$897FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$531Average$762FlexibilityNo cancel feeOn-time70%
TAP AIR PORTUGALCheapest$558Average$789FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$558Average$778FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$572Average$776FlexibilityNo cancel feeOn-time71%
FinnairCheapest$576Average$750FlexibilityNo cancel feeOn-time76%

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