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Cheap flights from Chicago to London Heathrow Airport from £182

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 30/1. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — LHR
3 Dec — 10 Dec1
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 29 days in advance, depart on a Sunday or Thursday and return on a Wednesday

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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 3 November 2025.

Fri 14/1118:30ORD - LHR
1 stop10h 20mIcelandair
Wed 19/1120:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 1/11£407
Sun 7/1219:20ORD - LHR
2 stops15h 05mScandinavian Airlines
Fri 12/1206:40LHR - ORD
1 stop16h 05mScandinavian Airlines
Deal found 1/11£408
Fri 5/1207:10ORD - LHR
2 stops26h 50mScandinavian Airlines
Tue 9/1219:50LHR - ORD
2 stops26h 55mScandinavian Airlines
Deal found 2/11£410
Sat 15/1118:30ORD - LHR
1 stop10h 20mIcelandair
Sat 22/1120:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 2/11£411
Sat 15/1118:30ORD - LHR
1 stop10h 20mIcelandair
Tue 25/1112:15LHR - ORD
1 stop11h 05mIcelandair
Deal found 2/11£412
Tue 18/1110:35ORD - LHR
2 stops25h 05mScandinavian Airlines
Tue 2/1219:50LHR - ORD
2 stops26h 55mScandinavian Airlines
Deal found 1/11£413
Sat 15/1118:30ORD - LHR
1 stop19h 00mIcelandair
Sun 23/1120:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 2/11£414
Sun 9/1110:35ORD - LHR
1 stop14h 15mVirgin Atlantic
Tue 18/1108:55LHR - ORD
1 stop12h 15mVirgin Atlantic
Deal found 1/11£414
Fri 28/1119:20ORD - LHR
1 stop14h 40mScandinavian Airlines
Sat 6/1206:40LHR - ORD
2 stops16h 05mScandinavian Airlines
Deal found 2/11£415
Sat 22/1119:20ORD - LHR
2 stops17h 30mScandinavian Airlines
Wed 26/1110:35LHR - ORD
2 stops36h 10mScandinavian Airlines
Deal found 2/11£416
Mon 1/1219:20ORD - LHR
2 stops20h 00mScandinavian Airlines
Sat 6/1217:30LHR - ORD
2 stops29h 15mScandinavian Airlines
Deal found 1/11£417
Sun 9/1119:40ORD - LHR
1 stop9h 45mAer Lingus
Tue 18/1108:50LHR - ORD
1 stop11h 10mAer Lingus
Deal found 1/11£417

Cheap 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 3 November 2025.

Round-trip from

£407

One-way from

£182

Popular in

June

Cheapest in

January

Average price

£521

Good round-trip deal

£497 or less

Good one-way deal

£303 or less
Icelandair
  • Icelandair
  • 14/11-19/11
  • 2 total stops
  • 37h 05m total
  • Chicago to London
Search Deals
WestJet
  • WestJet
  • 30/1
  • 1 total stop
  • 16h 30m total
  • Chicago to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£129 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 November 2025
Search Deals
Price to beat on a round-trip flight from Chicago (CHI) to London Heathrow.
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Price to beat on a one-way flight from Chicago (CHI) to London Heathrow.
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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 3 November 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

Tue 28/4

07:00-09:20

2 stops20h 20m

London Heathrow

Mon 4/5

06:40-16:10

1 stop15h 30m

£422

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 19/11

15:50-11:25

1 stop13h 35m

London Heathrow

Wed 3/12

09:00-15:10

1 stop12h 10m

£441

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 18/11

17:10-06:55

Nonstop7h 45m

London Heathrow

Wed 3/12

11:00-13:50

Nonstop8h 50m

£442

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 17/11

21:45-11:35

Nonstop7h 50m

London Heathrow

Wed 3/12

11:00-13:50

Nonstop8h 50m

£442

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 28/12

19:20-09:35

2 stops56h 15m

London Heathrow

Sat 7/2

10:20-16:45

1 stop12h 25m

£445

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Wed 12/11

10:47-06:25

1 stop13h 38m

London Heathrow

Tue 18/11

06:20-18:08

2 stops17h 48m

£449

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 17/11

13:04-06:25

1 stop11h 21m

London Heathrow

Thu 27/11

10:45-18:52

1 stop14h 07m

£454

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 18/11

13:47-07:05

1 stop11h 18m

London Heathrow

Tue 2/12

11:05-18:18

1 stop13h 13m

£454

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 18/11

13:47-07:05

1 stop11h 18m

London Heathrow

Fri 28/11

11:05-18:18

1 stop13h 13m

£454

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mon 17/11

13:47-07:05

1 stop11h 18m

London Heathrow

Wed 3/12

11:05-18:18

1 stop13h 13m

£454

Flights are sorted by cheapest return flights first.

Deals found on 2/11

Showing 1-10 of 45 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 31 October 2025.

Booking 29 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 £303). Flying from Chicago to London Heathrow Airport in June is currently the most expensive (average of £685). 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 3 November 2025.

It’s typically best to fly out from Chicago to London Heathrow Airport in the afternoon. Doing so could potentially save you 34% 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 3 November 2025.

The most flights from CHI to LHR are scheduled on a Sunday (45 on average). You will have fewer flight options on Monday, 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?

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 33% 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 £383.

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 Helsinki (HEL) offer the fastest connection on this route, with an average stopover time of 1h 28m.

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 3 November 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
3,005 reviews
Check prices

Entertainment

6.6

Boarding

7.1

Comfort

6.7

Overall

7.0

Food

6.3

Crew

7.7

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
3,005 reviews
Iberia
7.0
Good
3,005 reviews
Check prices

Entertainment

6.6

Boarding

7.1

Comfort

6.7

Overall

7.0

Food

6.3

Crew

7.7

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
7,494 reviews
Iberia
7.0
Good
3,005 reviews
Check prices

Entertainment

6.6

Boarding

7.1

Comfort

6.7

Overall

7.0

Food

6.3

Crew

7.7

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 7h 45m. Fly via Scandinavian Airlines, Delta, or British Airways 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 £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 Finnair. Lufthansa is priced at 39% lower than the current average price of a flight leaving 3 months from now.

  • 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 Gulf Air (75%), Malaysia Airlines (72%) and Air Canada (70%).

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

    While on average a flight from Chicago to London Heathrow Airport is generally £852, our data shows the cheapest flight currently is £287. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay £326 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 £303). Flying from Chicago to London Heathrow Airport in June is currently the most expensive (average of £685). 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
Gatwick
Hounslow
Northampton
Luton
Ilford
Wembley
Deal
Hayes
Colchester
Watford
Winchester
Chichester
Swindon
Crawley
Romford
Brentford
Ipswich

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 3 November 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£366Average£534FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
American AirlinesCheapest£394Average£642FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
FinnairCheapest£423Average£688FlexibilityNo cancel feeOn-time76%
Search Finnair flights
IberiaCheapest£456Average£540FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£460Average£585FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£472Average£710FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£503Average£618FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus 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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