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Cheap flights from Chicago to London Heathrow Airport from £281

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 13/3. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — LHR
16 Jan — 23 Jan1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Chicago to London Heathrow are usually found in October or January, booked 68 days in advance, depart on a Sunday or Thursday 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 17 December 2025.

Tue 30/1218:30ORD - LHR
1 stop10h 20mIcelandair
Sat 31/112:15LHR - ORD
1 stop11h 05mIcelandair
Deal found 16/12£418
Mon 29/1218:30ORD - LHR
1 stop19h 00mIcelandair
Mon 12/112:15LHR - ORD
1 stop35h 05mIcelandair
Deal found 16/12£426
Mon 29/1215:55ORD - LHR
2 stops22h 40mMultiple Airlines
Mon 12/120:05LHR - ORD
1 stop22h 40mMultiple Airlines
Deal found 16/12£464
Wed 31/1213:24ORD - LHR
1 stop11h 16mAustrian Airlines
Thu 8/112:05LHR - ORD
1 stop12h 32mAustrian Airlines
Deal found 14/12£472
Tue 30/1213:24ORD - LHR
1 stop11h 16mAustrian Airlines
Thu 8/112:05LHR - ORD
1 stop12h 32mAustrian Airlines
Deal found 13/12£475
Wed 31/1216:10ORD - LHR
1 stop18h 10mSWISS
Sun 11/120:05LHR - ORD
1 stop22h 40mSWISS
Deal found 16/12£477
Wed 31/1217:50ORD - LHR
Nonstop8h 05mUnited Airlines
Fri 9/107:25LHR - ORD
Nonstop9h 20mUnited Airlines
Deal found 16/12£478
Tue 30/1207:05ORD - LHR
1 stop18h 05mUnited Airlines
Fri 9/110:25LHR - ORD
Nonstop9h 20mUnited Airlines
Deal found 15/12£480
Wed 31/1211:48MDW - LHR
1 stop13h 17mDelta
Thu 8/111:05LHR - MDW
1 stop13h 27mDelta
Deal found 15/12£512
Tue 30/1218:08MDW - LHR
2 stops30h 42mDelta
Thu 8/116:50LHR - MDW
2 stops23h 37mDelta
Deal found 14/12£515
Wed 31/1209:29MDW - LHR
1 stop17h 16mDelta
Sun 11/108:55LHR - MDW
1 stop19h 12mDelta
Deal found 15/12£527
Wed 31/1209:29MDW - LHR
2 stops16h 21mDelta
Wed 7/109:40LHR - MDW
2 stops29h 12mDelta
Deal found 14/12£557

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 17 December 2025.

Round-trip from

£407

One-way from

£281

Popular in

June

Cheapest in

October

Average price

£662

Good round-trip deal

£564 or less

Good one-way deal

£297 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 15/3-18/3
  • 2 total stops
  • 30h 45m total
  • Chicago to London
Search Deals
JetBlue
  • JetBlue
  • 13/3
  • 1 total stop
  • 31h 33m total
  • Chicago to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£126 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£24 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
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 17 December 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

Mon 26/1

19:20-18:30

1 stop17h 10m

London Heathrow

Thu 29/1

10:20-16:55

1 stop12h 35m

£436

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 1/2

19:10-19:55

2 stops18h 45m

London Heathrow

Thu 5/2

10:20-16:45

1 stop12h 25m

£441

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 15/2

19:10-16:00

1 stop14h 50m

London Heathrow

Sat 14/3

06:40-17:45

1 stop16h 05m

£443

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 11/1

21:05-11:15

Nonstop8h 10m

London Heathrow

Wed 21/1

09:00-16:20

1 stop13h 20m

£463

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 14/1

17:50-07:55

Nonstop8h 05m

London Heathrow

Tue 20/1

09:00-16:20

1 stop13h 20m

£463

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 6/1

15:45-05:55

Nonstop8h 10m

London Heathrow

Mon 12/1

16:40-14:10

1 stop27h 30m

£471

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 6/1

15:45-05:55

Nonstop8h 10m

London Heathrow

Tue 13/1

08:30-15:20

1 stop12h 50m

£472

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 13/2

19:20-16:00

1 stop14h 40m

London Heathrow

Sat 14/3

10:20-17:45

1 stop12h 25m

£473

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 21/4

22:35-12:15

Nonstop7h 40m

London Heathrow

Wed 29/4

07:30-17:50

1 stop16h 20m

£474

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Sun 11/1

13:49-07:05

1 stop11h 16m

London Heathrow

Wed 21/1

06:30-17:55

2 stops17h 25m

£474

Flights are sorted by cheapest return flights first.

Deals found on 14/12

Showing 1-10 of 43 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 12 December 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, May is the cheapest month in which you can book a flight from Chicago to London Heathrow Airport (average of £298). Flying from Chicago to London Heathrow Airport in June is currently the most expensive (average of £678). 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 17 December 2025.

It’s typically best to fly out from Chicago to London Heathrow Airport in the afternoon. Doing so could potentially save you 35% on the flight price compared to flying in the evening, 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 17 December 2025.

The most flights from CHI to LHR are scheduled on a Monday (45 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (25 on average).

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 36% 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.

Copenhagen (CPH) is the most affordable one-stop option, with an average return flight price of £376.

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 1h 00m.

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 168 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 Thursday 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, United Airlines have had the lowest number of delays on this route, with just 23% 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 17 December 2025.
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
3,052 reviews
Check prices

Food

6.3

Crew

7.7

Boarding

7.1

Entertainment

6.6

Overall

7.0

Comfort

6.7

Reviews

1 / 20
6.0
Good

David,May 2025

JFK - MAD

Unfortunately carry on bag over head was full. I was seated 27J and had to place my carry on by seat 8 .. other then that it was a good flight
Iberia
7.0
Good
3,052 reviews
Iberia
7.0
Good
3,052 reviews
Check prices

Food

6.3

Crew

7.7

Boarding

7.1

Entertainment

6.6

Overall

7.0

Comfort

6.7

Reviews

1 / 20
6.0
Good

David,May 2025

JFK - MAD

Unfortunately carry on bag over head was full. I was seated 27J and had to place my carry on by seat 8 .. other then that it was a good flight
British Airways
6.7
Okay
7,582 reviews
Iberia
7.0
Good
3,052 reviews
Check prices

Food

6.3

Crew

7.7

Boarding

7.1

Entertainment

6.6

Overall

7.0

Comfort

6.7

Reviews

1 / 20
6.0
Good

David,May 2025

JFK - MAD

Unfortunately carry on bag over head was full. I was seated 27J and had to place my carry on by seat 8 .. other then that it was a good 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.

  • 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 10m. Fly via Scandinavian Airlines, United Airlines, or Delta 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 £359, 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 38% 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 £165 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include United Airlines from £259 and Lufthansa from £276 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 (65%), Finnair (65%) and Air Canada (64%).

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

    While on average a flight from Chicago to London Heathrow Airport is generally £461, our data shows the cheapest flight currently is £297. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay £322 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 £298). Flying from Chicago to London Heathrow Airport in June is currently the most expensive (average of £678). 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
Slough
Hounslow
Northampton
Luton
Gatwick
Wembley
Ilford
Brentford
Colchester
Hayes
Watford
Crawley
Swindon
Winchester
Bedford
Romford
Chichester
Eastbourne

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 17 December 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£359Average£518FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
American AirlinesCheapest£386Average£614FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
FinnairCheapest£415Average£577FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£424Average£592FlexibilityNo cancel feeOn-time70%
Search British Airways flights
IberiaCheapest£447Average£526FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Aer LingusCheapest£450Average£581FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£463Average£697FlexibilityNo cancel feeOn-time69%
Search United Airlines 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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