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Cheap flights from Chicago to London Heathrow Airport from £266

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 23/2. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — LHR
16 Mar — 23 Mar1
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 81 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 14 February 2026.

Mon 4/519:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Tue 12/521:25
LHR
-
ORD
1 stop26h 50m
Icelandair
Deal found 10/2£390
Thu 30/419:25
ORD
-
LHR
1 stop18h 55m
Icelandair
Mon 4/521:25
LHR
-
ORD
1 stop26h 50m
Icelandair
Deal found 11/2£393
Mon 20/419:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Thu 30/413:05
LHR
-
ORD
1 stop11h 10m
Icelandair
Deal found 10/2£394
Sun 19/422:25
ORD
-
LHR
1 stop15h 55m
Icelandair
Thu 30/413:05
LHR
-
ORD
1 stop11h 10m
Icelandair
Deal found 10/2£395
Thu 16/419:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Mon 20/413:05
LHR
-
ORD
1 stop11h 10m
Icelandair
Deal found 10/2£396
Thu 23/419:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Tue 28/413:05
LHR
-
ORD
1 stop11h 10m
Icelandair
Deal found 11/2£396
Tue 7/419:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Tue 21/421:25
LHR
-
ORD
1 stop26h 50m
Icelandair
Deal found 11/2£397
Fri 17/419:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Mon 27/421:25
LHR
-
ORD
1 stop26h 50m
Icelandair
Deal found 10/2£398
Mon 9/319:30
ORD
-
LHR
1 stop10h 20m
Icelandair
Fri 24/421:25
LHR
-
ORD
1 stop26h 50m
Icelandair
Deal found 12/2£398
Thu 23/419:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Wed 29/421:25
LHR
-
ORD
1 stop26h 50m
Icelandair
Deal found 10/2£400
Wed 8/419:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Tue 14/421:25
LHR
-
ORD
1 stop26h 50m
Icelandair
Deal found 13/2£401
Sun 1/313:49
MDW
-
LHR
1 stop11h 16m
KLM
Tue 17/311:05
LHR
-
MDW
1 stop12h 35m
KLM
Deal found 10/2£464

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 14 February 2026.

Round-trip from

£390

One-way from

£266

Popular in

June

Cheapest in

January

Average price

£471

Good round-trip deal

£494 or less

Good one-way deal

£283 or less
Icelandair
  • Icelandair
  • 4/5-9/5
  • 2 total stops
  • 37h 20m total
  • Chicago to London
Search Deals
Scandinavian Airlines
  • Scandinavian Airlines
  • 23/2
  • 2 total stops
  • 17h 30m total
  • Chicago to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£122 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£24 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 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 14 February 2026.
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

Tue 3/3

17:50-07:55

Nonstop8h 05m

London Heathrow

Tue 10/3

06:50-13:10

1 stop11h 20m

£459

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 1/3

21:15-11:15

Nonstop8h 00m

London Heathrow

Tue 10/3

06:50-13:10

1 stop11h 20m

£460

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 10/3

22:05-11:15

Nonstop8h 10m

London Heathrow

Wed 18/3

06:50-13:10

1 stop11h 20m

£460

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 11/3

16:45-05:55

Nonstop8h 10m

London Heathrow

Mon 16/3

12:05-17:20

1 stop34h 15m

£461

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 22/4

17:55-07:40

Nonstop7h 45m

London Heathrow

Wed 29/4

07:30-17:50

1 stop16h 20m

£470

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 23/3

18:45-07:55

Nonstop8h 10m

London Heathrow

Tue 21/4

10:50-18:15

1 stop13h 25m

£470

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 11/3

18:45-07:55

Nonstop8h 10m

London Heathrow

Thu 23/4

06:55-18:15

1 stop17h 20m

£473

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 3/3

13:29-10:15

2 stops14h 46m

London Heathrow

Tue 10/3

06:30-17:22

2 stops15h 52m

£473

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 24/3

14:10-07:50

1 stop12h 40m

London Heathrow

Wed 1/4

08:40-14:30

1 stop11h 50m

£475

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 24/3

17:50-09:20

1 stop10h 30m

London Heathrow

Thu 2/4

06:30-14:15

1 stop13h 45m

£475

Flights are sorted by cheapest return flights first.

Deals found on 10/2

Showing 1-10 of 39 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 6 February 2026.

Booking 81 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, May is the cheapest month in which you can book a flight from Chicago to London Heathrow Airport (average of £287). Flying from Chicago to London Heathrow Airport in June is currently the most expensive (average of £652). 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 14 February 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 14 February 2026.

The most flights from CHI to LHR are scheduled on a Tuesday (45 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (41 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 40% 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 £374.

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 26% of weekly flights between Chicago and London have experienced delays in the past year, with the average delay time being 167 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 14 February 2026.
Get a feel of what it's like to fly with Iberia and 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.
Iberia
7.0
Good
3,115 reviews
Check prices

Food

6.4

Boarding

7.2

Crew

7.7

Comfort

6.8

Overall

7.0

Entertainment

6.6

Reviews

1 / 20
6.0
Good

Anonymous,Dec 2025

LHR - DFW

Transparency. There was a gate change that was not disclosed on my ticket that made the connection to Vegas hurried. Also, it’s a given that for international travel, luggage pickup is required at first port of entry in the US, but please don’t have international employees set the expectation that luggage does not have to be picked up until the final destination. If I followed her instructions, my luggage would have been sitting at my connection now.
Iberia
7.0
Good
3,115 reviews
Iberia
7.0
Good
3,115 reviews
Check prices

Food

6.4

Boarding

7.2

Crew

7.7

Comfort

6.8

Overall

7.0

Entertainment

6.6

Reviews

1 / 20
6.0
Good

Anonymous,Dec 2025

LHR - DFW

Transparency. There was a gate change that was not disclosed on my ticket that made the connection to Vegas hurried. Also, it’s a given that for international travel, luggage pickup is required at first port of entry in the US, but please don’t have international employees set the expectation that luggage does not have to be picked up until the final destination. If I followed her instructions, my luggage would have been sitting at my connection now.
British Airways
6.7
Okay
7,739 reviews
Iberia
7.0
Good
3,115 reviews
Check prices

Food

6.4

Boarding

7.2

Crew

7.7

Comfort

6.8

Overall

7.0

Entertainment

6.6

Reviews

1 / 20
6.0
Good

Anonymous,Dec 2025

LHR - DFW

Transparency. There was a gate change that was not disclosed on my ticket that made the connection to Vegas hurried. Also, it’s a given that for international travel, luggage pickup is required at first port of entry in the US, but please don’t have international employees set the expectation that luggage does not have to be picked up until the final destination. If I followed her instructions, my luggage would have been sitting at my connection now.

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 7h 45m. Fly via United Airlines, Finnair, or Virgin Atlantic 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 £353, was found to be the cheapest airline from Chicago to London Heathrow Airport.Alternate airlines flying return to your destination include American Airlines and Finnair. Lufthansa is priced at 37% 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 £162 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include Lufthansa from £272 and British Airways from £274 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 Aer Lingus (72%), American Airlines (67%) and Alaska 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 £410, our data shows the cheapest flight currently is £131. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay £362 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, May is the cheapest month in which you can book a flight from Chicago to London Heathrow Airport (average of £287). Flying from Chicago to London Heathrow Airport in June is currently the most expensive (average of £652). 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
Croydon
Luton
Wembley
Northampton
Gatwick
Slough
Hounslow
Ilford
Hayes
Brentford
Colchester
Watford
Guildford
Chelmsford
Eastbourne
Crawley
Kingston upon Thames
Ipswich
Swindon

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.

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 14 February 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£353Average£507FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
American AirlinesCheapest£380Average£604FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
FinnairCheapest£408Average£567FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£417Average£562FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£443Average£571FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£455Average£654FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IberiaCheapest£465Average£527FlexibilityNo 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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