Cheap flights from Chicago to London Heathrow Airport from £239
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/2. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — LHR
4 Dec — 11 Dec1
Return
1 adult
Economy
Return
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 Monday or Wednesday and return on a Wednesday
Cheap flight deals from Chicago to Heathrow
Enter your travel dates to find the best prices.
Cheapest
Best
Direct
Last-minute
One-way
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 4 November 2026.
Tue 17/1118:30 -
3 stops33h 05m
Tue 24/1106:40 -
2 stops16h 40m
Deal found 3/11£513
Wed 18/1121:50 -
Nonstop7h 45m
Mon 30/1111:00 -
Nonstop8h 45m
Deal found 3/11£520
Thu 3/1218:30 -
3 stops33h 05m
Wed 9/1206:40 -
2 stops16h 40m
Deal found 2/11£526
Sun 22/1119:10 -
2 stops32h 25m
Wed 25/1106:40 -
1 stop16h 05m
Deal found 31/10£526
Sat 28/1119:10 -
2 stops56h 25m
Wed 2/1206:40 -
1 stop16h 05m
Deal found 3/11£527
Fri 4/1218:30 -
2 stops15h 55m
Tue 8/1206:40 -
2 stops16h 40m
Deal found 2/11£532
Tue 1/1218:30 -
2 stops16h 30m
Fri 11/1206:40 -
2 stops16h 40m
Deal found 3/11£534
Wed 2/1218:30 -
1 stop10h 20m
Tue 8/1212:15 -
1 stop35h 05m
Deal found 4/11£539
Sat 12/1219:10 -
2 stops39h 50m
Tue 15/1210:20 -
1 stop12h 25m
Deal found 3/11£540
Wed 9/1218:30 -
3 stops33h 05m
Wed 16/1206:40 -
2 stops16h 40m
Deal found 2/11£541
Tue 17/1118:30 -
1 stop19h 00m
Thu 3/1206:40 -
2 stops16h 40m
Deal found 31/10£544
Best flights from Chicago to Heathrow
Discover carefully curated flight deals from Chicago to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 4 November 2026.
Sat 10/419:15 -
2 stops15h 10m
Sat 17/406:40 -
2 stops15h 30m
Deal found 2/11£582
Fri 12/216:20 -
1 stop34h 00m
Mon 15/207:50 -
Nonstop9h 05m
Deal found 30/10£663
Wed 3/318:50 -
2 stops15h 50m
Sun 7/318:40 -
1 stop27h 35m
Deal found 3/11£717
Thu 3/1217:45 -
Nonstop8h 10m
Sun 6/1218:40 -
1 stop27h 35m
Deal found 2/11£751
Wed 3/309:10 -
2 stops20h 15m
Thu 11/319:55 -
1 stop25h 35m
Deal found 3/11£851
Wed 24/207:00 -
2 stops27h 00m
Thu 4/310:20 -
1 stop12h 25m
Deal found 31/10£612
Wed 27/107:00 -
2 stops27h 00m
Sun 31/121:05 -
2 stops25h 40m
Deal found 30/10£627
Sun 6/1215:45 -
Nonstop8h 10m
Mon 14/1209:00 -
1 stop13h 15m
Deal found 1/11£713
Fri 11/1219:10 -
2 stops41h 40m
Mon 18/110:20 -
1 stop12h 25m
Deal found 3/11£637
Sun 13/1213:55 -
1 stop11h 15m
Sun 20/1213:35 -
Nonstop9h 20m
Deal found 31/10£775
Sat 12/1221:50 -
Nonstop8h 10m
Wed 6/117:30 -
1 stop23h 35m
Deal found 3/11£778
Mon 29/310:30 -
2 stops23h 30m
Sat 3/406:40 -
2 stops32h 53m
Deal found 30/10£780
Direct flights from Chicago to Heathrow
Explore direct flight options from Chicago to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 4 November 2026.
Wed 18/1121:50 -
Nonstop7h 45m
Mon 30/1111:00 -
Nonstop8h 45m
Deal found 3/11£520
Tue 30/322:00 -
Nonstop8h 00m
Wed 21/411:10 -
Nonstop8h 40m
Deal found 30/10£542
Mon 29/322:00 -
Nonstop8h 00m
Thu 22/413:30 -
Nonstop8h 55m
Deal found 30/10£543
Tue 30/319:25 -
Nonstop8h 10m
Thu 22/416:05 -
Nonstop8h 54m
Deal found 3/11£549
Sun 28/319:25 -
Nonstop8h 10m
Tue 20/411:10 -
Nonstop8h 40m
Deal found 31/10£550
Mon 29/317:00 -
Nonstop7h 50m
Tue 20/411:10 -
Nonstop8h 40m
Deal found 2/11£551
Sun 28/317:00 -
Nonstop7h 50m
Thu 22/413:30 -
Nonstop8h 55m
Deal found 2/11£552
Tue 30/319:25 -
Nonstop8h 10m
Tue 20/413:30 -
Nonstop8h 55m
Deal found 30/10£554
Mon 29/322:00 -
Nonstop8h 00m
Sun 18/411:10 -
Nonstop8h 40m
Deal found 2/11£561
Tue 30/322:00 -
Nonstop8h 00m
Mon 19/416:05 -
Nonstop8h 54m
Deal found 2/11£561
Last-minute flights from Chicago to Heathrow
Discover last-minute flight deals from Chicago to Heathrow. Data last updated 4 November 2026 and is based on user searches.
Mon 9/1118:30 -
1 stop19h 00m
Mon 16/1120:35 -
1 stop26h 45m
Deal found 31/10£564
Mon 9/1118:30 -
1 stop19h 00m
Wed 18/1112:15 -
1 stop11h 05m
Deal found 31/10£572
Tue 10/1118:30 -
1 stop19h 00m
Tue 17/1106:40 -
2 stops16h 40m
Deal found 31/10£552
Tue 10/1118:30 -
1 stop10h 20m
Tue 17/1112:15 -
1 stop11h 05m
Deal found 30/10£558
Tue 10/1118:30 -
1 stop19h 00m
Wed 18/1112:15 -
1 stop11h 05m
Deal found 1/11£559
Wed 11/1119:10 -
1 stop14h 50m
Wed 18/1110:20 -
1 stop12h 25m
Deal found 30/10£562
Wed 11/1119:10 -
1 stop14h 50m
Sun 22/1106:40 -
1 stop16h 05m
Deal found 31/10£571
Thu 12/1119:10 -
1 stop16h 30m
Wed 18/1107:05 -
2 stops15h 40m
Deal found 30/10£573
Thu 12/1119:10 -
1 stop16h 30m
Fri 15/106:40 -
1 stop16h 05m
Deal found 2/11£574
One-way flights from Chicago to Heathrow
Search for one-way flight options from Chicago to Heathrow. Find affordable one-way fares based on user searches. Data last updated 4 November 2026.
Tue 2/219:20 -
Nonstop7h 55m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 3/11£239
Mon 16/1118:30 -
2 stops16h 30m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 1/11£239
Mon 15/217:10 -
Nonstop7h 45m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 3/11£240
Mon 1/219:20 -
Nonstop7h 55m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 3/11£241
Thu 18/314:30 -
1 stop11h 25m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 3/11£242
Sun 22/1118:30 -
1 stop10h 20m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 1/11£242
Fri 13/1120:10 -
1 stop19h 25m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£243
Sun 2/517:00 -
Nonstop7h 50m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 1/11£244
Mon 30/1118:30 -
2 stops20h 50m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 2/11£245
Sat 1/508:50 -
1 stop15h 40m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 3/11£245
Tue 2/215:45 -
Nonstop8h 10m
Wed 31/1200:00 -
Nonstop0h 00m
Deal found 1/11£246
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 4 November 2026.
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 7,457,451 searches. Data last updated 4 November 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 Chicago O'Hare Intl - LHR London Heathrow
ORDLHR
Chicago O'Hare Intl
Mon 15/3
14:00-09:10
2 stops14h 10m
London Heathrow
Wed 31/12
00:00-17:00
Nonstop0h 00m
£249
ChicagoLondon
ORD Chicago O'Hare Intl - LHR London Heathrow
ORDLHR
Chicago O'Hare Intl
Mon 16/11
13:00-21:35
2 stops26h 35m
London Heathrow
Wed 31/12
00:00-17:00
Nonstop0h 00m
£380
Fastest return journey
ChicagoLondon
ORD Chicago O'Hare Intl - LHR London Heathrow
ORDLHR
Chicago O'Hare Intl
Fri 19/3
16:45-05:55
Nonstop8h 10m
London Heathrow
Wed 31/12
00:00-17:00
Nonstop0h 00m
£406
ChicagoLondon
ORD Chicago O'Hare Intl - LHR London Heathrow
ORDLHR
Chicago O'Hare Intl
Sun 3/1
06:25-07:20
2 stops18h 55m
London Heathrow
Wed 31/12
00:00-17:00
Nonstop0h 00m
£420
ChicagoLondon
ORD Chicago O'Hare Intl - LHR London Heathrow
ORDLHR
Chicago O'Hare Intl
Wed 6/1
12:00-09:55
2 stops15h 55m
London Heathrow
Wed 31/12
00:00-17:00
Nonstop0h 00m
£420
ChicagoLondon
ORD Chicago O'Hare Intl - LHR London Heathrow
ORDLHR
Chicago O'Hare Intl
Thu 3/12
17:46-11:25
2 stops35h 39m
London Heathrow
Wed 31/12
00:00-17:00
Nonstop0h 00m
£433
ChicagoLondon
ORD Chicago O'Hare Intl - LHR London Heathrow
ORDLHR
Chicago O'Hare Intl
Thu 7/1
08:55-06:20
1 stop15h 25m
London Heathrow
Wed 31/12
00:00-17:00
Nonstop0h 00m
£457
ChicagoLondon
ORD Chicago O'Hare Intl - LHR London Heathrow
ORDLHR
Chicago O'Hare Intl
Sat 2/1
06:29-07:05
1 stop18h 36m
London Heathrow
Wed 31/12
00:00-17:00
Nonstop0h 00m
£457
ChicagoLondon
ORD Chicago O'Hare Intl - LHR London Heathrow
ORDLHR
Chicago O'Hare Intl
Fri 2/4
11:00-17:45
3 stops24h 45m
London Heathrow
Wed 31/12
00:00-17:00
Nonstop0h 00m
£460
ChicagoLondon
ORD Chicago O'Hare Intl - LHR London Heathrow
ORDLHR
Chicago O'Hare Intl
Sat 20/3
19:29-21:35
3 stops21h 06m
London Heathrow
Wed 31/12
00:00-17:00
Nonstop0h 00m
£532
Flights are sorted by cheapest return flights first.
Deals found on 3/11
Showing 1-10 of 22 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.
CHI-LHR
ORD-LHR
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
CHI-LHR
ORD-LHR
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 £467). Flying from Chicago to London Heathrow Airport in June is currently the most expensive (average of £1,035). 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 4 November 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 4 November 2026.
The most flights from CHI to LHR are scheduled on a Monday (42 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (39 on average).
How much does it cost for a return flight from Chicago to London Heathrow Airport?
Airfare is typical for this route at the moment.
Chicago to London Heathrow Airport flights typically cost between £508 and £730 in April.The cheapest return price found within the last 5 days was £512 on Scandinavian Airlines (14 Apr–29 Apr).
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 57% 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 £569.
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 21m.
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 56m.
How often are flights from Chicago to London delayed?
About 23% of weekly flights between Chicago and London have experienced delays in the past year, with the average delay time being 161 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 22% of flights being delayed.
How far ahead should I book a flight from Chicago to London Heathrow Airport?
Booking 65 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 4 November 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.
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.
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 15h 10m. Fly via Scandinavian Airlines 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?
Icelandair, at £365, was found to be the cheapest airline from Chicago to London Heathrow Airport.Alternate airlines flying return to your destination include British Airways and Aer Lingus. Icelandair is priced at 45% 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 £287 on Iberia. Other airlines that offer cheap prices include Lufthansa from £292 and British Airways from £297 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 (88%), Air Canada (84%) and Austrian Airlines (84%).
What are the cheapest flights from Chicago to London Heathrow Airport?
While on average a flight from Chicago to London Heathrow Airport is generally £596, our data shows the cheapest flight currently is £230. 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 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 £467). Flying from Chicago to London Heathrow Airport in June is currently the most expensive (average of £1,035). 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.
Explore flights to Heathrow departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 4 November 2026.
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 7,457,451 searches. Data last updated 4 November 2026.
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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