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Heathrow

$378+ Cheap flights from Chicago (CHI) to Heathrow (LHR)

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 8/10. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — LHR
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to London Heathrow are usually found in November or April, booked 68 days in advance, depart on a Wednesday or Tuesday and return on a Friday

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 June 12, 2025.

Round-trip from

$671
(Kiwi.com)

One-way from

$378
(Mytrip)

Popular in

June

Cheapest in

November

Average price

$1,253

Good round-trip deal

$667 or less

Good one-way deal

$496 or less
From Chicago (CHI) to London Heathrow
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One-way flight from Chicago (CHI) to London Heathrow
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Highest demand for flights based on searches. 22% potential increase in price ($230 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($41 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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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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Find flight deals from Chicago to Heathrow

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 June 12, 2025.

This Booking.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/157:15 pmORD - LHR
1 stop12h 20mScandinavian Airlines
Tue 9/29:05 pmLHR - ORD
2 stops49h 05mScandinavian Airlines
Deal found 6/12$669
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/227:25 pmORD - LHR
1 stop10h 30mIcelandair
Thu 8/281:05 pmLHR - ORD
1 stop11h 10mIcelandair
Deal found 6/10$671
This Cheapflightsfares deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/43:14 pmORD - LHR
1 stop10h 36mIberia
Wed 8/139:15 amLHR - ORD
Nonstop8h 40mIberia
Deal found 6/12$672
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/209:50 pmORD - LHR
1 stop27h 50mUnited Airlines
Tue 7/295:40 pmLHR - ORD
1 stop31h 49mUnited Airlines
Deal found 6/10$673
This Trip.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2212:43 pmMDW - LHR
1 stop12h 32mVirgin Atlantic
Tue 7/2911:45 amLHR - MDW
1 stop12h 55mVirgin Atlantic
Deal found 6/10$674
This SWISS deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/27:05 pmORD - LHR
2 stops20h 20mSWISS
Fri 11/148:55 amLHR - ORD
1 stop13h 20mSWISS
Deal found 6/12$677
This Air Canada deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/610:40 amORD - LHR
1 stop13h 50mAir Canada
Thu 8/145:40 pmLHR - ORD
2 stops27h 15mAir Canada
Deal found 6/11$681
This KLM deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/227:21 pmMDW - LHR
1 stop11h 49mKLM
Tue 7/2911:45 amLHR - MDW
1 stop12h 55mKLM
Deal found 6/10$681
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/276:47 pmMDW - LHR
1 stop12h 43mDelta
Tue 8/59:20 amLHR - MDW
1 stop12h 50mDelta
Deal found 6/12$682
This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/211:26 pmORD - LHR
1 stop11h 49mDelta
Thu 7/319:40 amLHR - ORD
1 stop14h 31mDelta
Deal found 6/10$689
This Air France deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/41:30 pmORD - LHR
1 stop11h 15mMultiple Airlines
Wed 9/109:00 amLHR - ORD
1 stop12h 00mMultiple Airlines
Deal found 6/12$690
This Cheapflightsfares deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/49:15 pmORD - LHR
Nonstop7h 50mBritish Airways
Wed 9/1011:05 amLHR - ORD
Nonstop8h 45mBritish Airways
Deal found 6/12$691

Cheapflights Fare Finder

Customize 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 2,558,603 searches. Data last updated June 12, 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

Fri 8/15

7:15 pm-1:35 pm

1 stop12h 20m

London Heathrow

Tue 9/2

9:05 pm-4:10 pm

2 stops49h 05m

$669

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 8/22

7:25 pm-11:55 am

1 stop10h 30m

London Heathrow

Thu 8/28

1:05 pm-6:15 pm

1 stop11h 10m

$671

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 8/4

3:14 pm-7:50 am

1 stop10h 36m

London Heathrow

Wed 8/13

9:15 am-11:55 am

Nonstop8h 40m

$672

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 7/20

9:50 pm-7:40 am

1 stop27h 50m

London Heathrow

Tue 7/29

5:40 pm-7:29 pm

1 stop31h 49m

$673

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 7/22

12:43 pm-7:15 am

1 stop12h 32m

London Heathrow

Tue 7/29

11:45 am-6:40 pm

1 stop12h 55m

$674

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 11/2

7:05 pm-4:40 pm

2 stops15h 35m

London Heathrow

Tue 11/11

6:00 am-4:15 pm

1 stop16h 15m

$677

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 8/6

10:40 am-6:30 am

1 stop13h 50m

London Heathrow

Thu 8/14

5:40 pm-2:55 pm

2 stops27h 15m

$681

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 7/22

7:21 pm-1:10 pm

1 stop11h 49m

London Heathrow

Tue 7/29

11:45 am-6:40 pm

1 stop12h 55m

$681

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Sun 7/27

6:47 pm-1:30 pm

1 stop12h 43m

London Heathrow

Tue 8/5

9:20 am-4:10 pm

1 stop12h 50m

$682

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 7/21

1:26 pm-7:15 am

1 stop11h 49m

London Heathrow

Thu 7/31

9:40 am-6:11 pm

1 stop14h 31m

$689

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 38 results
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The best insider tips for Chicago to London Heathrow Airport flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Chicago to London Heathrow Airport trip
Airlines
British Airways

BA's Club Suite offers private pods with doors, available on A350 and most 777 aircraft.


BA's World Traveller Plus offers extra seat width and legroom, ideal for long-haul comfort.

Read more about British Airwaysby Gabriel Leigh
Iberia

Iberia's premium economy offers 37-inch legroom, footrests, and noise-canceling headphones for long-haul comfort.


Iberia offers two hot meal options on long-haul flights, with special meals available upon request.

Read more about Iberiaby Emily Zemler
Airports
ORD

For a smooth departure from ORD, consider taking the "L" train to avoid Chicago traffic delays, especially during peak hours.

Read more about ORDby Ramsey Qubein
LHR

Upon arrival at LHR, the Heathrow Express offers the fastest route to central London, reaching Paddington Station quickly.

Read more about LHRby Ramsey Qubein
Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on British Airways

Gabriel Leigh

Gabriel Leigh

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Emily Zemler

Emily Zemler

Expert on Iberia

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on ORD and LHR

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

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 round-trip 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 round-trip flight from Chicago to Heathrow. Price data was last updated on June 9, 2025.

To ensure you get the cheapest price possible for a flight from Chicago to London Heathrow Airport, you should look to book at least 68 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, November is the cheapest month in which you can book a flight from Chicago to London Heathrow Airport (average of $661). Flying from Chicago to London Heathrow Airport in June is currently the most expensive (average of $1,108). 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 June 12, 2025.

When flying from Chicago to London Heathrow Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 15% versus a flight at noon.

What is the cheapest day to fly from Chicago to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from Chicago to Heathrow. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Chicago to London Heathrow Airport flight should consider departing on Wednesday mornings when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 June 12, 2025.

The most flights from CHI to LHR are scheduled on a Monday (57 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (48 on average).

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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 June 12, 2025.
Get a feel of what it's like to fly with Delta, KLM and Finnair from Chicago to London by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,358 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Finnair
7.6
Good
1,290 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air France
7.5
Good
1,463 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,623 reviews
Delta
8.0
Very good
7,950 reviews

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection 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.

  • What are the cheapest airlines flying from Chicago to London Heathrow Airport round-trip?

    Our cheapest airline available from Chicago to London Heathrow Airport is Icelandair. Our recent data shows that you can find tickets from as low as $671 on this airline. Additional options worth looking into are British Airways and United Airlines, starting at $672 and $674 round-trip. You may be able to fly from Chicago to London Heathrow Airport for 16% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Chicago to London Heathrow Airport one-way?

    To fly one-way, consider booking your trip with Air Canada, which is currently one of the cheapest options available, starting at $379. Virgin Atlantic flights start at $379 while deals on British Airways start at $380 one-way.

  • What are the most reliable airlines from Chicago to London Heathrow Airport?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Chicago to London Heathrow Airport on time: Royal Jordanian (81%), SriLankan Airlines (75%), Air Canada (72%).

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

    On average you can expect to pay $2,680 for a flight from Chicago to London Heathrow Airport. The cheapest flight overall is $412 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at $377.

  • Where are the most common layover locations when flying from Chicago to London Heathrow Airport?

    Chicago to London Heathrow Airport flights have a layover in Reykjavik most often. Reykjavik is followed by Dublin in terms of the most popular layover location on flights from Chicago to London Heathrow Airport.

  • What are some popular things to do or see while on a layover in Reykjavik?

    Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool are currently the most popular points of interest in Reykjavik at the moment. Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool can be accessed by traveling approximately 23.2 mi, 23.3 mi, and 24.6 mi, respectively from Reykjavik Keflavik Intl. Travelers in need of a car in Reykjavik can rent one for about $66 per day.

  • What are some popular points of interest to see during a layover in Dublin?

    Dublin travelers tend to visit Molly Malone Statue, Parnell Square, and St. Patrick's Cathedral more than any other notable places. Molly Malone Statue, Parnell Square and St. Patrick's Cathedral are located about 5.8 mi, 5.0 mi, and 6.1 mi, respectively from Dublin if you are interested in checking them out. Those looking to explore during their layover in Dublin can rent a car from Dublin for about $24 per day.

  • Where are the least popular layover locations for Chicago to London Heathrow Airport flights?

    Chicago to London Heathrow Airport flights that have layovers will least frequently stop in Copenhagen.

  • 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 vacation 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, November is the cheapest month in which you can book a flight from Chicago to London Heathrow Airport (average of $661). Flying from Chicago to London Heathrow Airport in June is currently the most expensive (average of $1,108). 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

Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Hayes
Hounslow
Thornton Heath
Luton
Canterbury
Harrow
Dover
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Gatwick
Orpington
Watford
Northampton
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Folkestone
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Broadway
Sutton
Aylesbury
Chelmsford
Brentwood

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Alternative routes for Chicago to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Heathrow flights
O'Hare Intl to Gatwick flights
O'Hare Intl to London City flights
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Midway to Luton flights
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Champaign to Heathrow flights
Bloomington to Gatwick flights

Top 10 airlines flying from Chicago to Heathrow

Discover the top 10 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 2,558,603 searches. Data last updated June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
SWISSCheapest$257Average$626FlexibilityNo cancel feeOn-time79%
DeltaCheapest$345Average$837FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$381Average$601FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$440Average$921FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$465Average$591FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$507Average$792FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$516Average$869FlexibilityNo cancel feeOn-time62%
Air CanadaCheapest$554Average$751FlexibilityNo cancel feeOn-time67%
FinnairCheapest$567Average$745FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$569Average$803FlexibilityNo cancel feeOn-timeN/A

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