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Cheap flights from Chicago to London Heathrow Airport from £297

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 10/8. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — LHR
27 May — 3 Jun1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Chicago to London Heathrow are usually found in January or February, booked 33 days in advance, depart on a Sunday or Monday and return on a Wednesday

Cheap flight deals from Chicago to Heathrow

Enter your travel dates to find the best prices.

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 27 April 2026.

Wed 2/1218:30
ORD
-
LHR
1 stop19h 00m
Icelandair
Sun 6/1212:15
LHR
-
ORD
1 stop11h 05m
Icelandair
Deal found 22/4£532
Tue 8/1218:30
ORD
-
LHR
1 stop10h 20m
Icelandair
Wed 16/1220:35
LHR
-
ORD
1 stop26h 45m
Icelandair
Deal found 23/4£533
Sun 1/1118:30
ORD
-
LHR
1 stop10h 20m
Icelandair
Sat 7/1120:35
LHR
-
ORD
1 stop26h 45m
Icelandair
Deal found 22/4£534
Mon 2/1118:30
ORD
-
LHR
1 stop10h 20m
Icelandair
Thu 12/1120:35
LHR
-
ORD
1 stop26h 45m
Icelandair
Deal found 23/4£535
Sun 1/1118:30
ORD
-
LHR
1 stop10h 20m
Icelandair
Fri 6/1112:15
LHR
-
ORD
1 stop11h 05m
Icelandair
Deal found 22/4£536
Mon 2/1118:30
ORD
-
LHR
1 stop10h 20m
Icelandair
Sat 7/1120:35
LHR
-
ORD
1 stop26h 45m
Icelandair
Deal found 22/4£537
Fri 8/519:25
ORD
-
LHR
1 stop18h 55m
Icelandair
Tue 19/513:05
LHR
-
ORD
1 stop11h 10m
Icelandair
Deal found 24/4£540
Tue 20/1019:15
ORD
-
LHR
2 stops31h 40m
Scandinavian Airlines
Fri 23/1006:40
LHR
-
ORD
1 stop15h 30m
Scandinavian Airlines
Deal found 22/4£541
Mon 2/1119:20
ORD
-
LHR
1 stop14h 40m
Scandinavian Airlines
Thu 12/1107:05
LHR
-
ORD
2 stops15h 40m
Scandinavian Airlines
Deal found 23/4£543
Fri 8/519:25
ORD
-
LHR
1 stop18h 55m
Icelandair
Sat 16/521:25
LHR
-
ORD
1 stop30h 00m
Icelandair
Deal found 24/4£545
Wed 28/1020:20
ORD
-
LHR
1 stop16h 20m
Scandinavian Airlines
Tue 3/1110:20
LHR
-
ORD
1 stop12h 25m
Scandinavian Airlines
Deal found 23/4£546
Sun 3/522:25
ORD
-
LHR
1 stop31h 30m
Icelandair
Tue 19/513:05
LHR
-
ORD
1 stop11h 10m
Icelandair
Deal found 24/4£548

Find 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 27 April 2026.

Round-trip from

£540

One-way from

£297

Popular in

June

Cheapest in

January

Average price

£560

Good round-trip deal

£680 or less

Good one-way deal

£396 or less
Icelandair
  • Icelandair
  • 8/5-19/5
  • 2 total stops
  • 30h 05m total
  • Chicago to London
Search Deals
Icelandair
  • Icelandair
  • 10/8
  • 1 total stop
  • 18h 55m total
  • Chicago to London
Search Deals
Highest demand for flights based on searches. 23% potential increase in price (£134 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£25 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
Search Deals
Price to beat on a round-trip flight from Chicago (CHI) to London Heathrow.
Search Deals
Price to beat on a one-way flight from Chicago (CHI) to London Heathrow.
Search Deals

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 27 April 2026.
Use the filters below to find and compare flights from Chicago to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 23/8

19:15-18:30

1 stop17h 15m

London Heathrow

Wed 2/9

06:40-22:06

2 stops21h 26m

£629

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mon 17/8

13:05-06:25

1 stop11h 20m

London Heathrow

Fri 28/8

08:40-18:05

2 stops15h 25m

£645

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 12/5

21:40-11:55

Nonstop8h 15m

London Heathrow

Wed 17/6

07:25-14:00

1 stop12h 35m

£657

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mon 21/9

13:05-06:25

1 stop11h 20m

London Heathrow

Wed 30/9

10:45-18:31

1 stop13h 46m

£666

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 10/9

21:15-11:15

Nonstop8h 00m

London Heathrow

Tue 15/9

07:30-17:50

1 stop16h 20m

£671

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 7/9

10:40-07:15

1 stop14h 35m

London Heathrow

Sat 19/9

06:30-17:41

2 stops17h 11m

£682

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Sun 17/5

09:22-07:10

1 stop15h 48m

London Heathrow

Fri 29/5

08:40-18:33

2 stops15h 53m

£690
Fastest return journey

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 10/9

16:25-06:45

Nonstop8h 20m

London Heathrow

Thu 17/9

14:10-17:25

Nonstop9h 15m

£693

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 15/10

07:00-09:20

2 stops20h 20m

London Heathrow

Sat 24/10

15:35-17:45

2 stops32h 10m

£713

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Sun 16/8

13:05-06:25

1 stop11h 20m

London Heathrow

Wed 26/8

12:25-18:05

1 stop11h 40m

£718

Flights are sorted by cheapest return flights first.

Deals found on 24/4

Showing 1-10 of 44 resultsSorted by cheapest first
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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?

Booking 32 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 £148). Flying from Chicago to London Heathrow Airport in June is currently the most expensive (average of £1,264). 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 27 April 2026.

When flying from Chicago to London Heathrow Airport, 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 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 27 April 2026.

The most flights from CHI to LHR are scheduled on a Monday (58 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (56 on average).

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

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

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

Dublin (DUB) – chosen by Cheapflights users on 47% of one-stop itineraries from Chicago to London Heathrow Airport on Cheapflights.

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

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

Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £377.

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

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

Flights via Dublin (DUB) have the shortest average one-way travel time for one-stop routes: 10h 10m.

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

Average stopover duration for one-stop one-way flights from Chicago to London Heathrow Airport, 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 stopover time of 0h 55m.

How often are flights from Chicago to London delayed?

About 25% of weekly flights between Chicago and London have experienced delays in the past year, with the average delay time being 171 minutes.

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

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

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

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

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

Over the past year, American Airlines have had the lowest number of delays on this route, with just 25% of flights being delayed.

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 27 April 2026.
Get a feel of what it's like to fly with British Airways 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.
British Airways
6.7
Okay
7,928 reviews
Check prices

Comfort

6.8

Overall

6.7

Boarding

6.9

Food

6.4

Crew

7.7

Entertainment

6.4

Reviews

1 / 20
10.0
Excellent

Viorica,Mar 2026

PHX - LHR

The food lately is just from poor to very poor. I bealeave that you can serve less quantities for more quality food. Exemple : at breakfast : omlete and vegetarian omlete ....I beleave with less work less personel could be provide some hummus and carrots and some boiled egss plus whatever snacks or drinks you wish....... Thank you in advance
British Airways
6.7
Okay
7,928 reviews
British Airways
6.7
Okay
7,928 reviews
Check prices

Comfort

6.8

Overall

6.7

Boarding

6.9

Food

6.4

Crew

7.7

Entertainment

6.4

Reviews

1 / 20
10.0
Excellent

Viorica,Mar 2026

PHX - LHR

The food lately is just from poor to very poor. I bealeave that you can serve less quantities for more quality food. Exemple : at breakfast : omlete and vegetarian omlete ....I beleave with less work less personel could be provide some hummus and carrots and some boiled egss plus whatever snacks or drinks you wish....... Thank you in advance

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.

  • How long is the flight from Chicago to London Heathrow Airport?

    There are many flights that can get you from Chicago to London Heathrow Airport in 8h 15m. Fly via Scandinavian Airlines, Delta, or United Airlines to get the fastest option. The distance from Chicago to London Heathrow Airport is about 3939 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    Lufthansa, at £355, was found to be the cheapest airline from Chicago to London Heathrow Airport.Alternate airlines flying return to your destination include American Airlines and British Airways. Lufthansa is priced at 39% 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 £163 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include Lufthansa from £273 and British Airways from £282 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 Air Canada (89%), Austrian Airlines (89%) and United Airlines (89%).

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

    While on average a flight from Chicago to London Heathrow Airport is generally £989, our data shows the cheapest flight currently is £375. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay £534 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 £148). Flying from Chicago to London Heathrow Airport in June is currently the most expensive (average of £1,264). 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 London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Wembley
Croydon
Northampton
Hounslow
Luton
Gatwick
Ilford
Slough
Hayes
Brentford
Colchester
Romford
Watford
Kingston upon Thames
Eastbourne
Swindon
Ipswich
Southend-on-Sea
Guildford

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from Chicago to Heathrow

Discover the top 6 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 27 April 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£355Average£510FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
American AirlinesCheapest£382Average£589FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
British AirwaysCheapest£419Average£627FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£455Average£600FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£458Average£658FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IberiaCheapest£514Average£621FlexibilityNo cancel feeOn-time77%
Search Iberia 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 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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