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Cheap flights from Chicago to London Heathrow Airport from £254

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 17/9. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — LHR
16 7월 — 23 7월1
1 adult

Cheapflights Tip: The best prices from Chicago to London Heathrow are usually found in November or April, booked 68 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Chicago to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) to Heathrow (LHR). 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 7월 2025.

Round-trip from

£457

One-way from

£254

Popular in

June

Cheapest in

November

Average price

£717

Good round-trip deal

£577 or less

Good one-way deal

£317 or less
British Airways
  • British Airways
  • 12/10-22/10
  • Nonstop
  • 16h 30m total
  • Chicago to London
Icelandair
  • Icelandair
  • 17/9
  • 1 total stop
  • 18h 55m total
  • Chicago to London
Highest demand for flights based on searches. 21% potential increase in price (£120 potential increase over avg. return price).
Cheapest flight prices on average. 5% potential price decrease (£23 potential savings vs. average return price).
Average for round-trip flights in July 2025
Price to beat on a round-trip flight from Chicago (CHI) to London Heathrow.
Price to beat on a one-way flight from Chicago (CHI) to London Heathrow.

Find flight deals from Chicago to Heathrow

Cheapest flights from Chicago to Heathrow
Explore the most affordable flight options available from Chicago to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 7월 2025.

일 12/1016:55ORD - LHR
Nonstop7h 55mBritish Airways
수 22/1012:15LHR - ORD
Nonstop8h 35mBritish Airways
Deal found 11/7£457
일 20/719:25ORD - LHR
1 stop10h 30mIcelandair
수 17/913:05LHR - ORD
1 stop11h 10mIcelandair
Deal found 10/7£459
토 16/818:05ORD - LHR
Nonstop8h 15mUnited Airlines
월 25/811:05LHR - ORD
Nonstop9h 05mUnited Airlines
Deal found 10/7£460
토 23/819:17MDW - LHR
1 stop11h 53mKLM
토 30/811:45LHR - MDW
1 stop12h 52mKLM
Deal found 8/7£464
금 22/807:00ORD - LHR
1 stop17h 45mDelta
일 31/806:15LHR - ORD
2 stops16h 30mDelta
Deal found 10/7£465
토 23/816:25MDW - LHR
1 stop15h 05mDelta
토 30/806:15LHR - MDW
2 stops18h 22mDelta
Deal found 8/7£465
금 22/812:43MDW - LHR
1 stop18h 47mVirgin Atlantic
일 31/806:30LHR - MDW
2 stops18h 07mVirgin Atlantic
Deal found 10/7£466
목 18/922:35ORD - LHR
Nonstop7h 40mIberia
토 27/910:05LHR - ORD
1 stop16h 38mIberia
Deal found 8/7£468
수 6/812:43MDW - LHR
1 stop12h 32mAir France
월 11/809:20LHR - MDW
1 stop18h 24mAir France
Deal found 11/7£468
수 1/1012:00ORD - LHR
2 stops12h 30mMultiple Airlines
수 8/1006:50LHR - ORD
2 stops14h 05mMultiple Airlines
Deal found 9/7£472
화 29/714:20ORD - LHR
1 stop15h 05mSWISS
월 8/920:05LHR - ORD
1 stop25h 50mSWISS
Deal found 10/7£474
월 21/708:40ORD - LHR
2 stops15h 50mAir Canada
수 17/912:40LHR - ORD
1 stop12h 14mAir Canada
Deal found 10/7£476

Cheapflights Fare Finder

Customise your flight search to find flights from Chicago to Heathrow 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 7월 2025.
Use the filters below to find and compare flights from Chicago to London Heathrow Airport that are best for you.

Fly from

Chicago

Fly to

Heathrow

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

일 12/10

16:55-06:50

Nonstop7h 55m

London Heathrow

수 22/10

12:15-14:50

Nonstop8h 35m

£457

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

월 21/7

19:25-11:55

1 stop10h 30m

London Heathrow

수 17/9

13:05-18:15

1 stop11h 10m

£459

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

토 16/8

18:05-08:20

Nonstop8h 15m

London Heathrow

토 23/8

14:10-17:20

Nonstop9h 10m

£460

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

토 23/8

19:17-13:10

1 stop11h 53m

London Heathrow

토 30/8

11:45-18:37

1 stop12h 52m

£464

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

금 22/8

07:00-06:45

1 stop17h 45m

London Heathrow

일 31/8

06:15-16:45

2 stops16h 30m

£465

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

토 23/8

10:31-07:15

1 stop14h 44m

London Heathrow

토 30/8

06:15-18:37

2 stops18h 22m

£465

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

목 18/9

19:15-16:25

2 stops15h 10m

London Heathrow

토 27/9

10:35-16:10

2 stops35h 35m

£468

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

수 6/8

12:43-07:15

1 stop12h 32m

London Heathrow

월 11/8

09:20-21:44

1 stop18h 24m

£468

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

수 1/10

17:40-07:20

Nonstop7h 40m

London Heathrow

수 8/10

12:15-14:50

Nonstop8h 35m

£469

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

토 23/8

13:08-10:30

2 stops15h 22m

London Heathrow

토 30/8

06:30-18:37

2 stops18h 07m

£469

Flights are sorted by cheapest return flights first.

Deals found on 11/7

Showing 1-10 of 28 results
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Best time to book a flight from Chicago to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Chicago 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 Chicago to London Heathrow Airport

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

Use this chart to determine the optimal time to book a return flight from Chicago to Heathrow. Price data was last updated on 27 June 2025.

Booking 68 days in advance of your planned departure date is, on average, the best time to get cheap flights from Chicago to London Heathrow Airport. 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 Chicago to London Heathrow Airport?

Currently, January is the cheapest month in which you can book a flight from Chicago to London Heathrow Airport (average of £112). Flying from Chicago to London Heathrow Airport in August is currently the most expensive (average of £164). 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 CHI to LHR?

Find hourly flight availability from Chicago to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 11 7월 2025.

It’s typically best to fly out from Chicago to London Heathrow Airport at midday. Doing so could potentially save you 14% on the flight price compared to flying in the morning, which is usually more expensive.

Weekly flight availability from Chicago to London Heathrow Airport

Explore weekly flight availability from Chicago to Heathrow. 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 7월 2025.

The most flights from CHI to LHR are scheduled on a Monday (57 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (52 on average).

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

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated 11 7월 2025.
Get a feel of what it's like to fly with Delta, KLM, andAustrian Airlines from Chicago to London Heathrow Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Crew

8.5

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very Good

Crew

8.5

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Crew

8.5

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Crew

8.5

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Crew

8.5

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Crew

8.5

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Chicago to Heathrow. 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 flying from Chicago to London Heathrow Airport round-trip?

    British Airways, at £457, was found to be the cheapest airline from Chicago to London Heathrow Airport.Alternate airlines flying return to your destination include Icelandair and United Airlines. British Airways is priced at 22% lower than the current average price of a flight leaving 3 months from now.

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

    One-way options have recently been found by users for as low as £254 on Icelandair. Other airlines that offer cheap prices include JetBlue from £260 and Air Canada from £269 one-way.

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

    The top 3 most reliable airlines when flying from Chicago to London Heathrow Airport are Royal Jordanian (70%), Air Canada (67%) and Austrian Airlines (67%).

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

    While on average a flight from Chicago to London Heathrow Airport is generally £1,672, our data shows the cheapest flight currently is £286. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay £314 for that flight.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Chicago to London Heathrow Airport (average of £112). Flying from Chicago to London Heathrow Airport in August is currently the most expensive (average of £164). 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

Travelling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Hounslow
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Watford
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Maidstone

Browse thousands of different options on Cheapflights for your next trip

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Top 7 airlines flying from Chicago to Heathrow

Discover the top 7 airlines that operate flights from Chicago to Heathrow. 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 7월 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£406Average£573FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
FinnairCheapest£409Average£594FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IberiaCheapest£441Average£563FlexibilityNo cancel feeOn-time77%
Search Iberia flights
United AirlinesCheapest£457Average£693FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£459Average£637FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest£479Average£797FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
American AirlinesCheapest£507Average£752FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

Fly with Cheapflights

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Heathrow from Chicago today with Cheapflights!

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Chicago to Heathrow for you. Better yet — we are completely free to use.

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

Certainly. Search results for flights to Heathrow from Chicago 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 Chicago to Heathrow become cheaper?

Yes! Start tracking prices for Chicago to Heathrow flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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