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Cheap flights from London Heathrow Airport to Chicago from £345

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 26/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — CHI
13 Mar — 20 Mar1
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 Tuesday 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 11 February 2026.

Wed 18/312:15
LHR
-
ORD
1 stop11h 05m
Icelandair
Mon 30/319:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Deal found 9/2£389
Fri 6/307:05
LHR
-
ORD
2 stops15h 50m
Scandinavian Airlines
Wed 11/320:20
ORD
-
LHR
1 stop16h 20m
Scandinavian Airlines
Deal found 8/2£391
Thu 12/307:05
LHR
-
ORD
2 stops15h 40m
Scandinavian Airlines
Thu 19/320:20
ORD
-
LHR
1 stop14h 40m
Scandinavian Airlines
Deal found 8/2£391
Sun 22/212:15
LHR
-
ORD
1 stop11h 05m
Icelandair
Sun 8/319:30
ORD
-
LHR
1 stop10h 20m
Icelandair
Deal found 8/2£392
Tue 17/312:15
LHR
-
ORD
1 stop11h 05m
Icelandair
Sun 29/319:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Deal found 8/2£393
Thu 19/212:15
LHR
-
ORD
1 stop11h 05m
Icelandair
Tue 24/218:30
ORD
-
LHR
1 stop19h 00m
Icelandair
Deal found 10/2£394
Wed 18/206:40
LHR
-
ORD
1 stop16h 05m
Scandinavian Airlines
Mon 9/320:20
ORD
-
LHR
1 stop14h 40m
Scandinavian Airlines
Deal found 8/2£395
Wed 4/320:35
LHR
-
ORD
1 stop26h 45m
Icelandair
Mon 9/319:30
ORD
-
LHR
1 stop19h 00m
Icelandair
Deal found 8/2£396
Mon 9/310:20
LHR
-
ORD
1 stop12h 25m
Scandinavian Airlines
Mon 20/419:15
ORD
-
LHR
1 stop14h 45m
Scandinavian Airlines
Deal found 8/2£397
Mon 2/306:40
LHR
-
ORD
1 stop16h 05m
Scandinavian Airlines
Wed 11/320:20
ORD
-
LHR
1 stop14h 40m
Scandinavian Airlines
Deal found 8/2£397
Wed 11/312:15
LHR
-
ORD
1 stop11h 05m
Icelandair
Tue 17/319:30
ORD
-
LHR
1 stop10h 20m
Icelandair
Deal found 8/2£398
Mon 23/211:05
LHR
-
MDW
1 stop13h 35m
Delta
Mon 9/310:45
MDW
-
LHR
1 stop16h 05m
Delta
Deal found 8/2£422

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 11 February 2026.

Round-trip from

£389

One-way from

£345

Popular in

July

Cheapest in

September

Average price

£441

Good round-trip deal

£487 or less

Good one-way deal

£416 or less
Icelandair
  • Icelandair
  • 18/3-30/3
  • 2 total stops
  • 21h 35m total
  • London to Chicago
Search Deals
Lufthansa
  • Lufthansa
  • 26/4
  • 2 total stops
  • 22h 30m 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 (£8 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 11 February 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Chicago that are best for you.

Fly from

Heathrow

Fly to

Chicago

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 28/2

18:00-17:48

1 stop29h 48m

Chicago O'Hare Intl

Mon 2/3

15:45-05:55

Nonstop8h 10m

£446

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 26/2

06:40-16:45

1 stop16h 05m

Chicago O'Hare Intl

Sun 1/3

19:20-16:25

2 stops15h 05m

£452

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 4/3

06:40-16:45

1 stop16h 05m

Chicago O'Hare Intl

Tue 10/3

13:37-09:20

2 stops14h 43m

£462

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 16/3

07:05-17:45

2 stops15h 40m

Chicago O'Hare Intl

Mon 23/3

20:20-18:50

2 stops17h 30m

£470

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 26/2

17:30-16:45

2 stops29h 15m

Chicago O'Hare Intl

Wed 11/3

20:20-16:00

1 stop14h 40m

£478

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 11/3

09:00-17:20

1 stop13h 20m

Chicago O'Hare Intl

Wed 18/3

12:03-06:20

1 stop13h 17m

£488

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 16/4

13:05-18:15

1 stop11h 10m

Chicago O'Hare Intl

Tue 16/6

22:25-20:20

1 stop15h 55m

£495

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 16/4

19:50-16:10

2 stops26h 20m

Chicago O'Hare Intl

Tue 16/6

10:10-09:20

2 stops17h 10m

£508

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 1/5

06:40-16:10

1 stop15h 30m

Chicago O'Hare Intl

Mon 4/5

11:08-09:35

2 stops16h 27m

£508

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Wed 18/3

06:30-17:22

2 stops15h 52m

Chicago Midway

Thu 1/10

13:00-10:20

2 stops15h 20m

£522

Flights are sorted by cheapest return flights first.

Deals found on 10/2

Showing 1-10 of 44 results
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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 6 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 £348). Flying from London Heathrow Airport to Chicago in July is currently the most expensive (average of £492). 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 11 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 11 February 2026.

The most flights from LHR to CHI are scheduled on a Wednesday (42 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (31 on average).

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 39% 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 £368.

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 11 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
9,274 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Crew

8.1

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
9,274 reviews
United Airlines
7.4
Good
9,274 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Crew

8.1

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
1,447 reviews
United Airlines
7.4
Good
9,274 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Crew

8.1

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
611 reviews
United Airlines
7.4
Good
9,274 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Crew

8.1

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.
Lufthansa
6.8
Okay
7,777 reviews
United Airlines
7.4
Good
9,274 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Crew

8.1

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
7,728 reviews
United Airlines
7.4
Good
9,274 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Crew

8.1

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 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 United Airlines, Scandinavian Airlines, 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 £332, Icelandair will fly you from London Heathrow Airport to Chicago and back. In addition to Icelandair, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Virgin Atlantic and Scandinavian Airlines - these airlines can fly you to your destination from £339 and £353, respectively. These flights start at 36% 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 £305. TAP AIR PORTUGAL flights start at £330 while deals on Aer Lingus start at £375 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: SWISS (90%), Air Canada (89%), Austrian Airlines( 89%).

  • 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 £1,255, our data indicates the cheapest price to be £363. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around £385.

  • 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 £348). Flying from London Heathrow Airport to Chicago in July is currently the most expensive (average of £492). 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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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 11 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 11 February 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£332Average£458FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£339Average£522FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Scandinavian AirlinesCheapest£353Average£476FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Aer LingusCheapest£358Average£620FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
TAP AIR PORTUGALCheapest£376Average£593FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Brussels AirlinesCheapest£379Average£533FlexibilityNo cancel feeOn-timeN/A
Search Brussels Airlines flights
LufthansaCheapest£387Average£567FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Austrian AirlinesCheapest£394Average£601FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
British AirwaysCheapest£395Average£571FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£402Average£541FlexibilityNo 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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