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Cheap flights from Chicago to London Heathrow Airport from £234

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 26/7. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — LHR
6 Aug — 13 Aug1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Chicago to London Heathrow are usually found in February or January, booked 33 days in advance, depart on a Monday or Sunday and return on a Thursday

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 7 July 2026.

Fri 9/1019:15
ORD
-
LHR
2 stops15h 10m
Scandinavian Airlines
Sun 18/1021:05
LHR
-
ORD
2 stops25h 05m
Scandinavian Airlines
Deal found 2/7£650
Tue 22/918:35
ORD
-
LHR
Nonstop8h 25m
United Airlines
Wed 30/906:50
LHR
-
ORD
1 stop11h 10m
United Airlines
Deal found 6/7£650
Sun 1/1113:28
MDW
-
LHR
2 stops15h 27m
Delta
Fri 6/1106:30
LHR
-
MDW
2 stops16h 09m
Delta
Deal found 6/7£650
Sun 30/819:15
ORD
-
LHR
1 stop14h 45m
Scandinavian Airlines
Tue 8/907:05
LHR
-
ORD
2 stops15h 05m
Scandinavian Airlines
Deal found 7/7£651
Sat 24/1016:25
MDW
-
LHR
1 stop33h 00m
Delta
Fri 30/1006:30
LHR
-
MDW
2 stops15h 09m
Delta
Deal found 6/7£651
Mon 12/1019:05
ORD
-
LHR
Nonstop8h 00m
British Airways
Fri 23/1015:15
LHR
-
ORD
Nonstop9h 00m
British Airways
Deal found 6/7£652
Sun 26/719:25
ORD
-
LHR
1 stop10h 30m
Icelandair
Wed 2/1220:35
LHR
-
ORD
1 stop26h 45m
Icelandair
Deal found 4/7£653
Tue 3/1109:29
MDW
-
LHR
2 stops15h 36m
Virgin Atlantic
Fri 13/1106:30
LHR
-
MDW
2 stops18h 07m
Virgin Atlantic
Deal found 6/7£653
Tue 8/919:15
ORD
-
LHR
2 stops15h 10m
Scandinavian Airlines
Sun 13/919:30
LHR
-
ORD
1 stop26h 40m
Scandinavian Airlines
Deal found 6/7£653
Mon 16/1113:00
MDW
-
LHR
2 stops14h 00m
Virgin Atlantic
Wed 25/1106:30
LHR
-
MDW
2 stops21h 40m
Virgin Atlantic
Deal found 6/7£653
Wed 19/810:30
ORD
-
LHR
2 stops16h 50m
Scandinavian Airlines
Mon 24/819:30
LHR
-
ORD
1 stop26h 40m
Scandinavian Airlines
Deal found 5/7£654
Wed 7/1013:00
MDW
-
LHR
2 stops15h 20m
Virgin Atlantic
Wed 14/1009:55
LHR
-
MDW
2 stops18h 30m
Virgin Atlantic
Deal found 3/7£654

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 7 July 2026.

Round-trip from

£650

One-way from

£234

Popular in

June

Cheapest in

February

Average price

£862

Good round-trip deal

£684 or less

Good one-way deal

£279 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 9/10-18/10
  • 4 total stops
  • 40h 15m total
  • Chicago to London
Search Deals
JetBlue
  • JetBlue
  • 26/7
  • 1 total stop
  • 21h 30m total
  • Chicago to London
Search Deals
Highest demand for flights based on searches. 26% potential increase in price (£173 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£29 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 7 July 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
Fastest return journey

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 16/11

21:50-12:00

Nonstop8h 10m

London Heathrow

Thu 19/11

07:40-10:45

Nonstop9h 05m

£658

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 27/9

16:25-06:45

Nonstop8h 20m

London Heathrow

Mon 5/10

17:50-12:00

1 stop24h 10m

£660

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 11/12

15:45-05:55

Nonstop8h 10m

London Heathrow

Thu 17/12

11:10-18:25

1 stop13h 15m

£674

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Wed 4/11

10:58-06:25

1 stop13h 27m

London Heathrow

Sat 14/11

08:40-18:37

2 stops15h 57m

£685

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mon 12/10

17:15-13:15

1 stop14h 00m

London Heathrow

Mon 19/10

06:30-16:39

2 stops16h 09m

£685

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 28/9

17:00-06:50

Nonstop7h 50m

London Heathrow

Sun 4/10

10:20-17:50

1 stop13h 30m

£690

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Fri 2/10

17:11-11:20

1 stop12h 09m

London Heathrow

Wed 14/10

06:30-16:39

2 stops16h 09m

£699

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Wed 16/9

13:19-10:40

2 stops15h 21m

London Heathrow

Wed 30/9

06:30-18:19

2 stops17h 49m

£710

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 22/8

18:05-12:45

1 stop12h 40m

London Heathrow

Sat 29/8

08:00-16:05

1 stop14h 05m

£712

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Wed 16/9

10:48-06:25

1 stop13h 37m

London Heathrow

Wed 23/9

12:25-18:19

1 stop11h 54m

£724

Flights are sorted by cheapest return flights first.

Deals found on 4/7

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

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

Currently, October is the cheapest month in which you can book a flight from Chicago to London Heathrow Airport (average of £82). Flying from Chicago to London Heathrow Airport in September is currently the most expensive (average of £1,298). 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 7 July 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 7 July 2026.

The most flights from CHI to LHR are scheduled on a Monday (58 on average). You will have fewer flight options on Wednesday, 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 67% 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 £382.

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 Reykjavik (KEF) have the shortest average one-way travel time for one-stop routes: 10h 20m.

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 24% of weekly flights between Chicago and London have experienced delays in the past year, with the average delay time being 170 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, British Airways have had the lowest number of delays on this route, with just 23% of flights being delayed.

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

Booking 83 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.

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 7 July 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
8,101 reviews
Check prices

Food

6.4

Crew

7.7

Comfort

6.8

Boarding

6.9

Overall

6.7

Entertainment

6.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

IAH - LHR

Airline was good the flight attendant were very helpful and kind. The problem I had is with cheap tickets, my ticket was not allowed one check in baggage this was new to me. I do a lot of traveling overseas and 1 check in baggage is always allowed. Also I bought insurance for my ticket it proved to be useless. I have called several times and spoke to your customer service, not one single person mentioned it to me that baggage was not allowed. All this additional expense was too much for me. I even asked one of your customer service representative I need to buy extra baggage should I buy it now and he told me when you receive check in information you can buy it @ that time never mentioned it to me that my ticket didn’t include baggage. It was very frustrating. I will never use cheap ticket again.
British Airways
6.7
Okay
8,101 reviews
British Airways
6.7
Okay
8,101 reviews
Check prices

Food

6.4

Crew

7.7

Comfort

6.8

Boarding

6.9

Overall

6.7

Entertainment

6.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

IAH - LHR

Airline was good the flight attendant were very helpful and kind. The problem I had is with cheap tickets, my ticket was not allowed one check in baggage this was new to me. I do a lot of traveling overseas and 1 check in baggage is always allowed. Also I bought insurance for my ticket it proved to be useless. I have called several times and spoke to your customer service, not one single person mentioned it to me that baggage was not allowed. All this additional expense was too much for me. I even asked one of your customer service representative I need to buy extra baggage should I buy it now and he told me when you receive check in information you can buy it @ that time never mentioned it to me that my ticket didn’t include baggage. It was very frustrating. I will never use cheap ticket again.

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 50m. Fly via United Airlines, Delta, or Finnair 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?

    Icelandair, at £366, 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. Icelandair is priced at 42% 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 £166 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include Lufthansa from £277 and British Airways from £286 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 SriLankan Airlines (74%), Gulf Air (69%) and Malaysia Airlines (69%).

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

    While on average a flight from Chicago to London Heathrow Airport is generally £586, our data shows the cheapest flight currently is £232. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay £445 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, October is the cheapest month in which you can book a flight from Chicago to London Heathrow Airport (average of £82). Flying from Chicago to London Heathrow Airport in September is currently the most expensive (average of £1,298). 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
Hounslow
Milton Keynes
Luton
Wembley
Gatwick
Slough
Croydon
Ilford
Hayes
Brentford
Colchester
Northampton
Watford
Kingston upon Thames
Eastbourne
Swindon
Poole
Southall
Aylesbury
Romford

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 7 July 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£366Average£490FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
American AirlinesCheapest£388Average£597FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
British AirwaysCheapest£415Average£562FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£461Average£783FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£511Average£699FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
IberiaCheapest£521Average£667FlexibilityNo cancel feeOn-time77%
Search Iberia flights
JetBlueCheapest£701Average£886FlexibilityNo cancel feeOn-time62%
Search JetBlue 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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