HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Chicago

$536+ Cheap flights from London (LON) to Chicago (CHI)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/20. Fares are subject to change and may not be available on all flights or dates of travel.
LON — CHI
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from London to Chicago with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from London to Chicago are usually found in February or March, booked 55 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap flight deals from London to Chicago

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Chicago (CHI). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 11, 2025.

Round-trip from

$536
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$625

Good round-trip deal

$756 or less

Good one-way deal

$651 or less
From London (LON) to Chicago (CHI)
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($114 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 September 2025
Search Deals
Price to beat on a round-trip flight from London (LON) to Chicago (CHI).
Search Deals
Price to beat on a one-way flight from London (LON) to Chicago (CHI).
Search Deals

Find flight deals from London to Chicago

Cheapest flights from London to Chicago
Explore the most affordable flight options available from London to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/10. 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 9/2010:00 amLGW - ORD
1 stop29h 18mMultiple Airlines
Tue 10/146:00 amORD - LGW
1 stop22h 00mMultiple Airlines
Deal found 9/10$536
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Tue 9/166:50 amLHR - ORD
1 stop11h 15mMultiple Airlines
Mon 9/227:05 pmORD - LHR
1 stop15h 20mMultiple Airlines
Deal found 9/10$536
This Mytrip deal was found by Cheapflights users on 9/10. 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 10/296:50 amLTN - ORD
2 stops19h 15mMultiple Airlines
Sun 11/27:20 pmORD - LTN
2 stops20h 40mMultiple Airlines
Deal found 9/10$536
This Norse deal was found by Cheapflights users on 9/11. 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 Norse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/22:00 pmLGW - ORD
1 stop32h 12mMultiple Airlines
Thu 10/96:00 amORD - LGW
1 stop22h 00mMultiple Airlines
Deal found 9/11$537
This Kiwi.com deal was found by Cheapflights users on 9/11. 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.
Tue 9/166:50 amLHR - ORD
1 stop11h 15mMultiple Airlines
Mon 9/299:25 pmORD - LHR
Nonstop8h 20mMultiple Airlines
Deal found 9/11$537
This Kiwi.com deal was found by Cheapflights users on 9/11. 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.
Sat 12/62:00 pmLGW - MDW
1 stop29h 10mMultiple Airlines
Tue 1/137:44 amMDW - LGW
1 stop16h 16mMultiple Airlines
Deal found 9/11$538
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 9/2010:00 amLGW - ORD
1 stop29h 18mMultiple Airlines
Sat 9/275:40 pmORD - LGW
2 stops30h 40mMultiple Airlines
Deal found 9/10$538
This United Airlines deal was found by Cheapflights users on 9/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/207:45 amLHR - ORD
2 stops15h 20mUnited Airlines
Wed 9/249:50 pmORD - LHR
Nonstop7h 55mUnited Airlines
Deal found 9/11$538
This Kiwi.com deal was found by Cheapflights users on 9/11. 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 10/22:00 pmLGW - MDW
1 stop24h 53mMultiple Airlines
Mon 10/68:19 amMDW - LGW
1 stop19h 41mMultiple Airlines
Deal found 9/11$539
This Gotogate deal was found by Cheapflights users on 9/9. 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 9/169:25 amLCY - ORD
1 stop12h 30mSWISS
Mon 9/297:05 pmORD - LCY
1 stop11h 25mSWISS
Deal found 9/9$539
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Sat 9/207:45 amLHR - ORD
2 stops15h 20mUnited Airlines
Sat 9/274:05 pmORD - LHR
1 stop11h 15mUnited Airlines
Deal found 9/10$539
This Austrian Airlines deal was found by Cheapflights users on 9/10. 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 10/26:00 amLHR - ORD
1 stop13h 20mAustrian Airlines
Fri 10/104:20 pmORD - LHR
1 stop34h 25mAustrian Airlines
Deal found 9/10$540

Cheapflights Fare Finder

 
Customize your flight search to find flights from London to Chicago 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 September 11, 2025.
Use the filters below to find and compare flights from London to Chicago that are best for you.

Fly from

London

Fly to

Chicago

Route

Depart

Return

Price

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 1/22

4:00 pm-3:15 pm

1 stop29h 15m

Chicago O'Hare Intl

Sun 1/25

8:25 pm-3:45 pm

1 stop13h 20m

$537

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 10/7

6:50 am-3:04 pm

2 stops14h 14m

Chicago O'Hare Intl

Tue 10/14

10:40 am-6:30 am

1 stop13h 50m

$539

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 10/9

8:40 am-3:55 pm

1 stop13h 15m

Chicago O'Hare Intl

Mon 10/13

5:01 am-9:40 am

1 stop22h 39m

$539

LondonChicago

LTN - ORD

LTNORD

London Luton

Thu 10/30

9:00 am-6:20 pm

2 stops14h 20m

Chicago O'Hare Intl

Sun 11/2

6:30 pm-10:00 pm

2 stops21h 30m

$541

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 10/9

9:15 am-4:05 pm

1 stop12h 50m

Chicago O'Hare Intl

Wed 10/15

8:40 pm-10:30 am

Nonstop7h 50m

$548

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 10/30

7:05 am-6:45 pm

2 stops16h 40m

Chicago O'Hare Intl

Sun 11/2

7:20 pm-6:50 pm

2 stops17h 30m

$549

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 10/9

9:40 am-6:10 pm

1 stop14h 30m

Chicago O'Hare Intl

Wed 10/15

7:05 am-6:45 am

1 stop17h 40m

$549

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 10/9

9:15 am-5:36 pm

1 stop14h 21m

Chicago O'Hare Intl

Tue 10/14

3:10 pm-7:50 am

1 stop10h 40m

$550

LondonChicago

LGW - MDW

LGWMDW

London Gatwick

Thu 10/2

2:00 pm-7:11 am

2 stops23h 11m

Chicago Midway

Sun 10/5

10:13 am-10:10 am

1 stop17h 57m

$552

LondonChicago

LCY - ORD

LCYORD

London City

Sat 12/6

8:40 am-4:20 pm

1 stop13h 40m

Chicago O'Hare Intl

Sun 12/7

4:10 pm-6:40 pm

1 stop20h 30m

$553

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/8

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from London to Chicago

Have a flexible travel schedule? Discover the best time to fly to Chicago 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 Chicago

How far ahead should I book a flight from London to Chicago?

Use this chart to determine the optimal time to book a round-trip flight from London to Chicago. Price data was last updated on August 29, 2025.

The best time to book flights from London to Chicago is 55 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

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

Find hourly flight availability from London to Chicago. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 31% on flights from London to Chicago by exploring options for tickets in the evening.

Weekly flight availability from London to Chicago

Explore weekly flight availability from London to Chicago. 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 September 11, 2025.

The most flights from LON to CHI are scheduled on a Thursday (53 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (46 on average).

What’s the top layover airport for flights from London to Chicago?

Share of 1-stop round-trip flights from London to Chicago chosen by Cheapflights users in the past 12 months, using the same layover each way.

Reykjavik (KEF) – chosen by Cheapflights users on 56% of 1-stop itineraries from London to Chicago on Cheapflights.

What’s the cheapest layover airport for flights from London to Chicago?

Average round-trip fare for 1-stop flights from London to Chicago, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Lisbon (LIS) is the most affordable 1-stop option, with an average round-trip price of $478.

What’s the fastest layover option from London to Chicago?

Shortest average travel time for 1-stop one-way flights from London to Chicago, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Reykjavik (KEF) have the shortest average one-way travel time for 1-stop routes: 11h 10m.

Which airport typically offers the quickest layover for flights from London to Chicago?

Average layover duration for 1-stop one-way flights from London to Chicago, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average layover time of 1h 05m.

Reviews of airlines servicing Chicago

Get insights into the airlines that provide service to Chicago. 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 Chicago. Reviews last updated September 11, 2025.
See what other customers who have flown with United Airlines, American Airlines, and Icelandair from London to Chicago have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,937 reviews

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.6

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
8,937 reviews
United Airlines
7.4
Good
8,937 reviews

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.6

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
8,937 reviews

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.6

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
546 reviews
United Airlines
7.4
Good
8,937 reviews

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.6

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!
Iberia
7.0
Good
2,929 reviews
United Airlines
7.4
Good
8,937 reviews

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.6

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
7,361 reviews
United Airlines
7.4
Good
8,937 reviews

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.6

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 Chicago. 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 London to Chicago?

    For as low as $539, TAP AIR PORTUGAL can have you in Chicago from London in 13h 15m. The distance from London to Chicago is about 3939 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from London to Chicago round-trip?

    Currently priced at $390, Icelandair will fly you from London to Chicago and back. In addition to Icelandair, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Aer Lingus and Scandinavian Airlines - these airlines can fly you to your destination from $453 and $462, respectively. Icelandair is currently priced 43% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from London to Chicago one-way?

    $554 is the cheapest one-way deal found within the past few days, from British Airways. You may also be able to find cheap deals on Lufthansa and Austrian Airlines, with prices starting from $554 and $554, respectively.

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

    While some choose either London Heathrow - Chicago Midway or London Gatwick - Chicago O'Hare Intl, London Heathrow - Chicago O'Hare Intl is the most popular route from London to Chicago.

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

    Before booking your flight to Chicago from London, check out the most reliable airlines to get you to your destination on time: Air Canada (75%), Austrian Airlines (75%), United Airlines( 75%).

  • What are the cheapest flights from London to Chicago?

    While on average a flight from London to Chicago is generally $1,476, our data shows the cheapest flight currently is $593. When looking at the most popular route, (London Heathrow - Chicago O'Hare Intl), you can expect to pay $435 for that flight.

  • Can I find deals for flights from London to Chicago that include hotel bookings?

    Yes. In addition to deals on London to Chicago flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from London to Chicago?

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

  • Can I find deals for business class flights from London to Chicago?

    Yes. Cheapflights offers flight deals from London to Chicago 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 Chicago?

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

Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Merrillville
Lansing
Hammond
Benton Harbor
Porter
Chesterton

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for London to Chicago

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to O'Hare Intl flights
Heathrow to Midway flights
Gatwick to O'Hare Intl flights
London City to O'Hare Intl flights
Stansted to O'Hare Intl flights
Luton to O'Hare Intl flights
Edinburgh to O'Hare Intl flights
Manchester to O'Hare Intl flights
Heathrow to St. Louis flights
Gatwick to St. Louis flights
Birmingham to O'Hare Intl flights
Birmingham to Midway flights
Newcastle upon Tyne to O'Hare Intl flights
Birmingham to St. Louis flights
Manchester to St. Louis flights
Leeds to O'Hare Intl flights
Newcastle upon Tyne to St. Louis flights
Southampton to O'Hare Intl flights
Norwich to O'Hare Intl flights
Bristol to O'Hare Intl flights
Edinburgh to St. Louis flights
Liverpool to O'Hare Intl flights
Exeter to O'Hare Intl flights
Leeds to St. Louis flights
Gatwick to Evansville flights

Top 10 airlines flying from London to Chicago

Discover the top 10 airlines that operate flights from London to Chicago. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$390Average$561FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$453Average$683FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$462Average$537FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$485Average$746FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$553Average$769FlexibilityNo cancel feeOn-time70%
TAP AIR PORTUGALCheapest$558Average$789FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$582Average$793FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$582Average$809FlexibilityNo cancel feeOn-time71%
Austrian AirlinesCheapest$586Average$967FlexibilityNo cancel feeOn-time78%
FinnairCheapest$607Average$809FlexibilityNo cancel feeOn-time76%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.