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Illinois

$559+ Cheap flights from London (LON) 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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ORD
Aug 18 — Aug 251
Mon 8/18
Mon 8/25
1 adult, Economy
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Cheap flight deals from London to Illinois

Keep the following information in mind while searching for London to Illinois flight deals. Data was last updated August 13, 2025.

Round-trip from

$572
(Icelandair)

One-way from

$559
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$843

Good round-trip deal

$717 or less

Good one-way deal

$664 or less
From London (LON) to Illinois
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One-way flight from London (LON) to Illinois
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Highest demand for flights based on searches. 13% potential increase in price ($113 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($16 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from London (LON) to Illinois.
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Price to beat on a one-way flight from London (LON) to Illinois.
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Find flight deals from London to Illinois

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 August 13, 2025.

This Icelandair deal was found by Cheapflights users on 8/12. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/211:00 pmLGW - ORD
1 stop11h 15mIcelandair
Thu 10/27:25 pmORD - LGW
1 stop13h 15mIcelandair
Deal found 8/12$572
This American Airlines deal was found by Cheapflights users on 8/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/318:10 amLHR - ORD
1 stop13h 35mAmerican Airlines
Sun 9/281:59 pmORD - LHR
1 stop10h 21mAmerican Airlines
Deal found 8/12$572
This Icelandair deal was found by Cheapflights users on 8/11. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/301:00 pmLGW - ORD
1 stop11h 15mIcelandair
Fri 10/310:15 pmORD - LGW
1 stop10h 25mIcelandair
Deal found 8/11$573
This United Airlines deal was found by Cheapflights users on 8/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/218:30 amLHR - ORD
1 stop12h 25mUnited Airlines
Sat 9/1310:35 amORD - LHR
1 stop13h 20mUnited Airlines
Deal found 8/12$573
This Mytrip deal was found by Cheapflights users on 8/11. 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.
Thu 9/2510:55 pmSTN - ORD
2 stops28h 20mMultiple Airlines
Thu 10/27:25 pmORD - STN
2 stops21h 00mMultiple Airlines
Deal found 8/11$573
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/272:00 pmLGW - MDW
1 stop25h 18mMultiple Airlines
Sat 10/410:51 amMDW - LGW
1 stop17h 09mMultiple Airlines
Deal found 8/13$574
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/62:00 pmLGW - ORD
1 stop33h 27mMultiple Airlines
Wed 10/1511:13 amORD - LGW
1 stop13h 07mMultiple Airlines
Deal found 8/13$574
This Cheapflightsfares deal was found by Cheapflights users on 8/11. 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.
Fri 11/2111:00 amLHR - ORD
Nonstop8h 50mBritish Airways
Sat 11/298:45 pmORD - LHR
Nonstop7h 40mBritish Airways
Deal found 8/11$574
This Mytrip deal was found by Cheapflights users on 8/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/288:45 amLTN - ORD
2 stops18h 30mMultiple Airlines
Sun 8/317:25 pmORD - LTN
2 stops14h 15mMultiple Airlines
Deal found 8/12$574
This Mytrip deal was found by Cheapflights users on 8/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/36:40 amSTN - ORD
1 stop18h 20mMultiple Airlines
Sun 10/53:45 pmORD - STN
1 stop10h 05mMultiple Airlines
Deal found 8/12$574
This Justfly.com deal was found by Cheapflights users on 8/13. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/213:40 pmLGW - ORD
1 stop11h 35mIcelandair
Sat 9/67:25 pmORD - LGW
1 stop10h 20mIcelandair
Deal found 8/13$575
This Austrian Airlines deal was found by Cheapflights users on 8/12. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/96:00 amLHR - ORD
1 stop13h 20mAustrian Airlines
Sun 10/1212:55 pmORD - LHR
1 stop12h 00mAustrian Airlines
Deal found 8/12$575

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated August 13, 2025.
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 8/23

1:00 pm-6:15 pm

1 stop11h 15m

Chicago O'Hare Intl

Thu 10/2

7:25 pm-2:40 pm

1 stop13h 15m

$572

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 9/10

2:00 pm-10:52 am

2 stops26h 52m

Chicago O'Hare Intl

Wed 9/17

6:30 am-10:00 am

1 stop21h 30m

$572

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sat 8/30

1:00 pm-9:15 pm

1 stop14h 15m

Chicago O'Hare Intl

Tue 9/30

7:25 pm-2:40 pm

1 stop13h 15m

$572

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 9/25

10:00 am-9:18 am

1 stop29h 18m

Chicago O'Hare Intl

Sat 10/18

11:12 am-6:20 am

1 stop13h 08m

$572

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Tue 12/16

11:55 am-5:20 pm

1 stop11h 25m

Chicago O'Hare Intl

Mon 12/22

6:30 pm-10:55 am

1 stop10h 25m

$572

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 9/3

1:05 pm-9:15 pm

1 stop14h 10m

Chicago O'Hare Intl

Thu 10/2

7:25 pm-8:20 pm

1 stop18h 55m

$572

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sat 9/27

10:00 am-9:18 am

1 stop29h 18m

Chicago O'Hare Intl

Sat 10/4

6:30 am-10:00 am

1 stop21h 30m

$573

LondonChicago

STN - ORD

STNORD

London Stansted

Thu 9/25

10:55 pm-9:15 pm

2 stops28h 20m

Chicago O'Hare Intl

Thu 10/2

7:25 pm-10:25 pm

2 stops21h 00m

$573

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sat 8/30

1:00 pm-6:15 pm

1 stop11h 15m

Chicago O'Hare Intl

Fri 10/3

10:15 pm-2:40 pm

1 stop10h 25m

$573

LondonChicago

LGW - MDW

LGWMDW

London Gatwick

Sat 9/27

2:00 pm-9:18 am

1 stop25h 18m

Chicago Midway

Sat 10/4

10:51 am-10:00 am

1 stop17h 09m

$574

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/11

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 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 London to Illinois

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

Currently, August is the cheapest month in which you can book a flight from London to Illinois (average of $245). Flying from London 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 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 August 13, 2025.

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 August 13, 2025.

The most flights from LON to USIL are scheduled on a Monday (53 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (47 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 August 13, 2025.
See what other customers who have flown with United Airlines, American Airlines, and Icelandair from London to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,920 reviews

Comfort

7.3

Food

6.6

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
United Airlines
7.4
Good
8,920 reviews
United Airlines
7.4
Good
8,920 reviews

Comfort

7.3

Food

6.6

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,920 reviews

Comfort

7.3

Food

6.6

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
Icelandair
7.0
Good
526 reviews
United Airlines
7.4
Good
8,920 reviews

Comfort

7.3

Food

6.6

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
Lufthansa
6.8
Okay
7,317 reviews
United Airlines
7.4
Good
8,920 reviews

Comfort

7.3

Food

6.6

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
British Airways
6.7
Okay
7,265 reviews
United Airlines
7.4
Good
8,920 reviews

Comfort

7.3

Food

6.6

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

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.

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

    The most popular route from London to Illinois is London Heathrow - Chicago O'Hare Intl. You may also consider London Gatwick - Chicago O'Hare Intl or London Heathrow - Chicago Midway.

  • What are the most reliable airlines from London to Illinois?

    Consider SWISS (77%), Air Canada (77%) or Austrian Airlines (77%) when booking your flight. These represent the most reliable airlines when flying from London to Illinois.

  • What are the cheapest flights from London to Illinois?

    The cheapest flight price from London to Illinois is $574. On average you can expect to pay $1,379. The most popular route, (London Heathrow - Chicago O'Hare Intl), can usually be booked for $472.

  • 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 vacation 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, August is the cheapest month in which you can book a flight from London to Illinois (average of $245). Flying from London 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

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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 2,558,603 searches. Data last updated August 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$390Average$561FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$462Average$568FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$485Average$748FlexibilityNo cancel feeOn-time69%
Aer LingusCheapest$493Average$693FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$552Average$778FlexibilityNo cancel feeOn-time70%
TAP AIR PORTUGALCheapest$558Average$789FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$582Average$793FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$583Average$796FlexibilityNo cancel feeOn-time71%
Austrian AirlinesCheapest$586Average$987FlexibilityNo cancel feeOn-time78%
FinnairCheapest$607Average$809FlexibilityNo cancel feeOn-time76%

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