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$327+ 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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
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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 July 31, 2025.

Round-trip from

$574
(Booking.com)

One-way from

$327
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$885

Good round-trip deal

$749 or less

Good one-way deal

$714 or less
From United Kingdom to Illinois
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One-way flight from United Kingdom to Illinois
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Highest demand for flights based on searches. 14% potential increase in price ($120 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from United Kingdom to Illinois.
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Price to beat on a one-way flight from United Kingdom to Illinois.
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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 July 31, 2025.

This Air Canada deal was found by Cheapflights users on 7/30. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/116:50 amLHR - ORD
2 stops14h 05mAir Canada
Mon 9/156:01 pmORD - LHR
1 stop11h 49mAir Canada
Deal found 7/30$581
This Icelandair deal was found by Cheapflights users on 7/31. 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.
Sun 10/193:40 pmLGW - ORD
1 stop11h 35mIcelandair
Tue 10/287:30 pmORD - LGW
1 stop10h 25mIcelandair
Deal found 7/31$582
This ChecknFly deal was found by Cheapflights users on 7/30. 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 ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/99:15 amLHR - ORD
1 stop14h 21mFinnair
Mon 10/136:58 amORD - LHR
2 stops17h 22mFinnair
Deal found 7/30$582
This Mytrip deal was found by Cheapflights users on 7/30. 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.
Sat 9/136:35 amSTN - ORD
1 stop13h 25mMultiple Airlines
Sat 9/279:15 pmORD - STN
1 stop10h 25mMultiple Airlines
Deal found 7/30$582
This Icelandair deal was found by Cheapflights users on 7/30. 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.
Fri 9/191:05 pmLHR - ORD
1 stop11h 10mIcelandair
Tue 10/147:25 pmORD - LHR
1 stop10h 30mIcelandair
Deal found 7/30$583
This Kiwi.com deal was found by Cheapflights users on 7/31. 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.
Fri 9/511:30 amLTN - ORD
1 stop13h 30mMultiple Airlines
Fri 9/129:15 pmORD - LTN
1 stop10h 20mMultiple Airlines
Deal found 7/31$583
This TravelUp deal was found by Cheapflights users on 7/30. 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.
Fri 8/228:25 pmLHR - ORD
1 stop23h 35mMultiple Airlines
Sun 9/149:25 pmORD - LHR
Nonstop8h 20mMultiple Airlines
Deal found 7/30$584
This SWISS deal was found by Cheapflights users on 7/31. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/69:15 amLCY - ORD
1 stop13h 05mSWISS
Wed 11/126:50 pmORD - LCY
1 stop16h 15mSWISS
Deal found 7/31$585
This Mytrip deal was found by Cheapflights users on 7/30. 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.
Fri 8/292:00 pmLGW - ORD
2 stops26h 31mMultiple Airlines
Fri 9/56:44 pmORD - LGW
2 stops29h 36mMultiple Airlines
Deal found 7/30$586
This Kiwi.com deal was found by Cheapflights users on 7/29. 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 9/119:50 amLHR - ORD
1 stop11h 55mBritish Airways
Tue 9/169:15 pmORD - LHR
Nonstop7h 50mBritish Airways
Deal found 7/29$587
This TravelUp deal was found by Cheapflights users on 7/31. 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.
Thu 10/93:15 pmLHR - MDW
1 stop12h 59mVirgin Atlantic
Mon 10/131:08 pmMDW - LHR
1 stop13h 47mVirgin Atlantic
Deal found 7/31$587
This Lufthansa deal was found by Cheapflights users on 7/30. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/258:45 amLCY - ORD
1 stop12h 10mMultiple Airlines
Mon 9/297:05 pmORD - LCY
1 stop11h 25mMultiple Airlines
Deal found 7/30$592

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 July 31, 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

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 9/11

6:50 am-2:55 pm

2 stops14h 05m

Chicago O'Hare Intl

Mon 9/15

6:01 pm-11:50 am

1 stop11h 49m

$581

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sun 10/19

3:40 pm-9:15 pm

1 stop11h 35m

Chicago O'Hare Intl

Tue 11/18

6:30 pm-10:55 am

1 stop10h 25m

$582

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 10/9

9:15 am-5:36 pm

1 stop14h 21m

Chicago O'Hare Intl

Mon 10/13

6:58 am-6:20 am

2 stops17h 22m

$582

LondonChicago

STN - ORD

STNORD

London Stansted

Sat 9/13

6:35 am-2:00 pm

1 stop13h 25m

Chicago O'Hare Intl

Sat 9/27

9:15 pm-1:40 pm

1 stop10h 25m

$582

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 9/19

1:05 pm-6:15 pm

1 stop11h 10m

Chicago O'Hare Intl

Tue 10/14

7:25 pm-11:55 am

1 stop10h 30m

$583

LondonChicago

LTN - ORD

LTNORD

London Luton

Fri 9/5

11:30 am-7:00 pm

1 stop13h 30m

Chicago O'Hare Intl

Fri 9/12

9:15 pm-1:35 pm

1 stop10h 20m

$583

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 8/22

8:25 pm-2:00 pm

1 stop23h 35m

Chicago O'Hare Intl

Sun 9/14

9:25 pm-11:45 am

Nonstop8h 20m

$584

LondonChicago

LCY - ORD

LCYORD

London City

Thu 11/6

9:15 am-4:20 pm

1 stop13h 05m

Chicago O'Hare Intl

Wed 11/12

6:50 pm-5:05 pm

1 stop16h 15m

$585

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 9/11

9:50 am-3:45 pm

1 stop11h 55m

Chicago O'Hare Intl

Thu 9/18

9:15 pm-11:05 am

Nonstop7h 50m

$587

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Thu 10/9

3:15 pm-10:14 pm

1 stop12h 59m

Chicago Midway

Mon 10/13

1:08 pm-8:55 am

1 stop13h 47m

$587

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

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, August is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of $245). Flying from United Kingdom to Illinois in March is currently the most expensive (average of $321). 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 July 31, 2025.

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 July 31, 2025.

The most flights from GB0 to USIL are scheduled on a Monday (53 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (48 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 July 31, 2025.
Read reviews from past customers who have flown Delta, KLM, and Austrian Airlines from the United Kingdom to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Austrian Airlines
7.6
Good
823 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Finnair
7.6
Good
1,316 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Air France
7.5
Good
1,465 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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.

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

    $459 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 Icelandair, with prices starting from $529 and $565, 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, August is the cheapest month in which you can book a flight from United Kingdom to Illinois (average of $245). Flying from United Kingdom to Illinois in March is currently the most expensive (average of $321). 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.
Heathrow to John F Kennedy Intl flights
Heathrow to Newark flights
Charles de Gaulle to John F Kennedy Intl flights
Charles de Gaulle to Newark flights
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Stansted to John F Kennedy Intl flights
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Madrid to Newark 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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$390Average$626FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$462Average$569FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$485Average$840FlexibilityNo cancel feeOn-time69%
Aer LingusCheapest$504Average$864FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$552Average$793FlexibilityNo cancel feeOn-time70%
TAP AIR PORTUGALCheapest$558Average$789FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$582Average$793FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$583Average$792FlexibilityNo cancel feeOn-time71%
Austrian AirlinesCheapest$586Average$967FlexibilityNo cancel feeOn-time78%
FinnairCheapest$607Average$838FlexibilityNo cancel feeOn-time76%

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