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Cheap flights from London Heathrow Airport to Chicago from £340

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 4/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — CHI
28 Mar — 4 Apr1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London Heathrow to Chicago are usually found in September or February, booked 45 days in advance, depart on a Wednesday or Thursday and return on a Sunday

Cheap flight deals from Heathrow to Chicago

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Chicago
Explore the most affordable flight options available from Heathrow to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 February 2026.

Wed 15/408:00
LHR
-
ORD
1 stop14h 00m
TAP AIR PORTUGAL
Sat 25/418:05
ORD
-
LHR
1 stop12h 40m
TAP AIR PORTUGAL
Deal found 23/2£400
Thu 12/316:30
LHR
-
ORD
1 stop28h 55m
TAP AIR PORTUGAL
Sun 22/321:25
ORD
-
LHR
1 stop15h 05m
TAP AIR PORTUGAL
Deal found 23/2£401
Sat 18/406:00
LHR
-
ORD
1 stop13h 20m
Austrian Airlines
Sat 18/415:45
ORD
-
LHR
1 stop33h 40m
Austrian Airlines
Deal found 22/2£404
Fri 17/419:50
LHR
-
ORD
1 stop26h 15m
TAP AIR PORTUGAL
Sat 25/418:05
ORD
-
LHR
1 stop34h 15m
TAP AIR PORTUGAL
Deal found 24/2£405
Fri 17/419:50
LHR
-
ORD
1 stop26h 15m
TAP AIR PORTUGAL
Sun 26/418:00
ORD
-
LHR
1 stop22h 55m
TAP AIR PORTUGAL
Deal found 25/2£406
Fri 17/418:45
LHR
-
ORD
1 stop27h 20m
TAP AIR PORTUGAL
Fri 24/418:00
ORD
-
LHR
1 stop18h 50m
TAP AIR PORTUGAL
Deal found 25/2£407
Fri 17/406:40
LHR
-
ORD
1 stop15h 30m
Scandinavian Airlines
Mon 20/419:15
ORD
-
LHR
1 stop20h 25m
Scandinavian Airlines
Deal found 25/2£408
Fri 17/406:40
LHR
-
ORD
1 stop15h 30m
Scandinavian Airlines
Mon 27/419:15
ORD
-
LHR
2 stops15h 10m
Scandinavian Airlines
Deal found 25/2£410
Mon 13/407:05
LHR
-
ORD
2 stops15h 05m
Scandinavian Airlines
Mon 27/419:15
ORD
-
LHR
2 stops15h 10m
Scandinavian Airlines
Deal found 23/2£410
Wed 11/1108:55
LHR
-
MDW
1 stop18h 50m
Virgin Atlantic
Mon 30/1113:05
MDW
-
LHR
1 stop13h 55m
Virgin Atlantic
Deal found 22/2£519
Wed 16/913:25
LHR
-
MDW
1 stop14h 21m
Virgin Atlantic
Wed 23/910:35
MDW
-
LHR
1 stop14h 40m
Virgin Atlantic
Deal found 24/2£521
Mon 13/412:25
LHR
-
MDW
1 stop12h 11m
Air France
Mon 27/412:52
MDW
-
LHR
1 stop11h 33m
Air France
Deal found 23/2£529

Find flight deals from Heathrow to Chicago

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) 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 26 February 2026.

Round-trip from

£400

One-way from

£340

Popular in

July

Cheapest in

September

Average price

£454

Good round-trip deal

£514 or less

Good one-way deal

£419 or less
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 15/4-25/4
  • 2 total stops
  • 26h 40m total
  • London to Chicago
Search Deals
Lufthansa
  • Lufthansa
  • 4/5
  • 2 total stops
  • 16h 55m total
  • London to Chicago
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£41 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£7 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from London Heathrow to Chicago (CHI).
Search Deals
Price to beat on a one-way flight from London Heathrow to Chicago (CHI).
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow 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 858,174 searches. Data last updated 26 February 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Chicago that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 16/4

19:50-16:10

2 stops26h 20m

Chicago O'Hare Intl

Fri 24/4

19:15-16:00

1 stop14h 45m

£449

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 1/5

21:25-18:15

1 stop26h 50m

Chicago O'Hare Intl

Sun 10/5

19:25-11:55

1 stop10h 30m

£459

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 27/4

06:40-16:10

2 stops15h 30m

Chicago O'Hare Intl

Thu 30/4

11:08-16:00

2 stops22h 52m

£510

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 29/5

07:05-16:10

2 stops15h 05m

Chicago O'Hare Intl

Wed 26/8

19:15-16:25

2 stops15h 10m

£513

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 12/3

21:05-17:55

2 stops25h 50m

Chicago O'Hare Intl

Fri 20/3

20:20-18:30

2 stops17h 10m

£539

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 13/4

07:05-16:10

2 stops15h 05m

Chicago O'Hare Intl

Wed 22/4

19:15-16:25

2 stops15h 10m

£549

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Tue 24/3

06:30-17:22

2 stops15h 52m

Chicago Midway

Tue 31/3

10:45-06:45

2 stops14h 00m

£574

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 12/4

08:00-10:55

Nonstop8h 55m

Chicago O'Hare Intl

Thu 30/4

18:10-08:30

Nonstop8h 20m

£577

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 21/5

06:40-16:10

1 stop15h 30m

Chicago O'Hare Intl

Thu 23/7

19:15-19:55

2 stops18h 40m

£585

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 20/5

06:40-16:10

1 stop15h 30m

Chicago O'Hare Intl

Sun 31/5

19:15-18:50

2 stops17h 35m

£586

Flights are sorted by cheapest return flights first.

Deals found on 23/2

Showing 1-10 of 43 resultsSorted by cheapest first
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Best time to book a flight from Heathrow to Chicago

Have a flexible travel schedule? Discover the best time to fly to Chicago from Heathrow with our price prediction graph.
Estimated return 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 Heathrow Airport to Chicago

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

Use this chart to determine the optimal time to book a return flight from Heathrow to Chicago. Price data was last updated on 20 February 2026.

Booking 45 days in advance of your planned departure date is, on average, the best time to get cheap flights from London Heathrow Airport to Chicago. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to Chicago (average of £353). Flying from London Heathrow Airport to Chicago in July is currently the most expensive (average of £497). 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 LHR to CHI?

Find hourly flight availability from Heathrow 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 26 February 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London Heathrow Airport to Chicago as you normally would.

Weekly flight availability from London Heathrow Airport to Chicago

Explore weekly flight availability from Heathrow 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 26 February 2026.

The most flights from LHR to CHI are scheduled on a Wednesday (42 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (36 on average).

How much does it cost for a return flight from London Heathrow Airport to Chicago?

What’s the top stopover airport for flights from London Heathrow Airport to Chicago?

Share of one-stop return flights from London Heathrow Airport to Chicago chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Reykjavik (KEF) – chosen by Cheapflights users on 42% of one-stop itineraries from London Heathrow Airport to Chicago on Cheapflights.

What’s the cheapest stopover airport for flights from London Heathrow Airport to Chicago?

Average return fare for one-stop flights from London Heathrow Airport to Chicago, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Frankfurt am Main (FRA) is the most affordable one-stop option, with an average return flight price of £372.

What’s the fastest stopover option from London Heathrow Airport to Chicago?

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

Flights via Montreal (YUL) have the shortest average one-way travel time for one-stop routes: 11h 14m.

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to Chicago?

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

Flights via Helsinki (HEL) offer the fastest connection on this route, with an average stopover time of 1h 15m.

How often are flights from London to Chicago delayed?

About 11% of weekly flights between London and Chicago have experienced delays in the past year, with the average delay time being 170 minutes.

What is the most punctual flight time for London to Chicago flights?

Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Thursday tends to have the lowest number of delays on this route, whereas Friday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on London to Chicago flights?

Over the past year, United Airlines have had the lowest number of delays on this route, with just 5% of flights being delayed.

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 26 February 2026.
See what other customers who have flown with United Airlines, Aer Lingus, andIcelandair from London Heathrow Airport 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
9,348 reviews
Check prices

Food

6.6

Overall

7.4

Crew

8.1

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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
9,348 reviews
United Airlines
7.4
Good
9,348 reviews
Check prices

Food

6.6

Overall

7.4

Crew

8.1

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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
1,464 reviews
United Airlines
7.4
Good
9,348 reviews
Check prices

Food

6.6

Overall

7.4

Crew

8.1

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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
617 reviews
United Airlines
7.4
Good
9,348 reviews
Check prices

Food

6.6

Overall

7.4

Crew

8.1

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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.
Lufthansa
6.8
Okay
7,812 reviews
United Airlines
7.4
Good
9,348 reviews
Check prices

Food

6.6

Overall

7.4

Crew

8.1

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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
7,768 reviews
United Airlines
7.4
Good
9,348 reviews
Check prices

Food

6.6

Overall

7.4

Crew

8.1

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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 Heathrow 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 Heathrow Airport to Chicago?

    There are many flights that can get you from London Heathrow Airport to Chicago in 15h 52m. Fly via Scandinavian Airlines, Icelandair, or Virgin Atlantic to get the fastest option. London Heathrow Airport and Chicago are separated by a distance of 3942 mi. This flight may include one or multiple stops.

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

    Currently priced at £342, Virgin Atlantic will fly you from London Heathrow Airport to Chicago and back. In addition to Virgin Atlantic, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Icelandair and Aer Lingus - these airlines can fly you to your destination from £345 and £362, respectively. These flights start at 35% lower than the current average price 3 months from now.

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

    To fly one-way, consider booking your trip with JetBlue, which is currently one of the cheapest options available, starting at £308. Icelandair flights start at £323 while deals on Aer Lingus start at £379 one-way.

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

    Before booking your flight to Chicago from London Heathrow Airport, check out the most reliable airlines to get you to your destination on time: Air Canada (91%), United Airlines (91%), Brussels Airlines( 91%).

  • What are the cheapest flights from London Heathrow Airport to Chicago?

    Looking for the cheapest flight from London Heathrow Airport to Chicago? While on average our users pay £1,330, our data indicates the cheapest price to be £363. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £392.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Heathrow 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 Heathrow Airport to Chicago?

    Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to Chicago (average of £353). Flying from London Heathrow Airport to Chicago in July is currently the most expensive (average of £497). 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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Fly from Heathrow to Chicago on these airlines

Choose from the following airlines for your flight from Heathrow to Chicago. Flights are based on user searches made on Cheapflights and were last updated on 26 February 2026.
British Airways flights from London Heathrow to Chicago
Lufthansa flights from London Heathrow to Chicago
Finnair flights from London Heathrow to Chicago

Top 10 airlines flying from Heathrow to Chicago

Discover the top 10 airlines that operate flights from Heathrow 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 858,174 searches. Data last updated 26 February 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£342Average£526FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
IcelandairCheapest£345Average£460FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£362Average£627FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Scandinavian AirlinesCheapest£366Average£496FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£383Average£606FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Brussels AirlinesCheapest£383Average£538FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
LufthansaCheapest£391Average£574FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£398Average£570FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Austrian AirlinesCheapest£398Average£608FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
United AirlinesCheapest£408Average£554FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Heathrow to Chicago?

Cheapflights makes it easy to find Heathrow to Chicago flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Heathrow to Chicago?

Cheapflights helps you find that perfect flight to Chicago from Heathrow by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Heathrow to Chicago with no change fees?

Certainly. Search results for flights to Chicago from Heathrow shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Heathrow to Chicago become cheaper?

Yes, Cheapflights offers price alerts on Heathrow to Chicago flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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