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$377+ Cheap flights from Chicago (CHI) to London (LON)

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 8/2. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — LON
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 are usually found in February or January, booked 84 days in advance, depart on a Wednesday or Tuesday and return on a Friday

Cheap flight deals from Chicago to London

Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) to London (LON). 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

$377
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$1,142

Good round-trip deal

$667 or less

Good one-way deal

$496 or less
From Chicago (CHI) to London (LON)
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One-way flight from Chicago (CHI) to London (LON)
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Highest demand for flights based on searches. 21% potential increase in price ($206 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($34 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 (LON).
Search Deals
Price to beat on a one-way flight from Chicago (CHI) to London (LON).
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Find flight deals from Chicago to London

Cheapest flights from Chicago to London
Explore the most affordable flight options available from Chicago to London. 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 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.
Tue 11/47:05 pmORD - LCY
1 stop17h 35mSWISS
Tue 11/119:15 amLCY - ORD
1 stop13h 00mSWISS
Deal found 6/12$669
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.
Mon 7/287:05 pmORD - LGW
1 stop16h 45mSWISS
Mon 8/116:35 pmLGW - ORD
1 stop27h 20mSWISS
Deal found 6/12$670
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 Virgin Atlantic 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/2010:37 amORD - LGW
1 stop17h 23mVirgin Atlantic
Tue 7/2912:00 pmLGW - ORD
2 stops18h 09mVirgin Atlantic
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 Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/287:25 pmORD - LGW
1 stop10h 20mIcelandair
Wed 8/63:40 pmLGW - ORD
1 stop11h 35mIcelandair
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 Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/17:25 pmORD - LGW
1 stop10h 20mMultiple Airlines
Mon 9/810:00 amLGW - ORD
2 stops18h 28mMultiple Airlines
Deal found 6/12$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 Lufthansa 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1910:30 pmORD - LCY
1 stop11h 55mMultiple Airlines
Wed 8/279:25 amLCY - ORD
1 stop12h 30mMultiple Airlines
Deal found 6/10$675
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/47:25 pmORD - STN
2 stops20h 45mMultiple Airlines
Tue 8/197:00 amSTN - ORD
2 stops17h 15mMultiple Airlines
Deal found 6/11$675

Cheapflights Fare Finder

Customize your flight search to find flights from Chicago to London 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 that are best for you.

Fly from

Chicago

Fly to

London

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 - LCY

ORDLCY

Chicago O'Hare Intl

Wed 8/20

2:20 pm-8:50 am

1 stop12h 30m

London City

Wed 8/27

9:25 am-3:55 pm

1 stop12h 30m

$669

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 7/28

7:05 pm-5:50 pm

1 stop16h 45m

London Gatwick

Mon 8/11

6:35 pm-3:55 pm

1 stop27h 20m

$670

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 - LGW

ORDLGW

Chicago O'Hare Intl

Sun 7/20

10:37 am-10:00 am

1 stop17h 23m

London Gatwick

Tue 7/29

12:00 pm-12:09 am

2 stops18h 09m

$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 - LGW

ORDLGW

Chicago O'Hare Intl

Mon 7/28

7:25 pm-11:45 am

1 stop10h 20m

London Gatwick

Wed 8/6

3:40 pm-9:15 pm

1 stop11h 35m

$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

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 9/1

7:25 pm-11:45 am

1 stop10h 20m

London Gatwick

Mon 9/8

10:00 am-10:28 pm

2 stops18h 28m

$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

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

Showing 1-10 of 60 results
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The best insider tips for Chicago to London 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 trip
Airlines
British Airways

BA's Club Suite offers solo pods with doors for privacy; available on most 777s and A350s.


BA's World Traveller Plus provides 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's business class features lay-flat beds with massage function and adjustable pillows for ultimate relaxation.

Read more about Iberiaby Emily Zemler
Airports
ORD

For a quick departure from ORD, consider taking the 'L' train to avoid Chicago traffic delays.

Read more about ORDby Ramsey Qubein
LHR

Use the Heathrow Express for the fastest route to central London from LHR, arriving at Paddington Station.

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 London

Have a flexible travel schedule? Discover the best time to fly to London 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

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

Use this chart to determine the optimal time to book a round-trip flight from Chicago to London. Price data was last updated on June 9, 2025.

The best time to book flights from Chicago to London is 84 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, November is the cheapest month in which you can book a flight from Chicago to London (average of $661). Flying from Chicago to London 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 LON?

Find hourly flight availability from Chicago to London. 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.

A simple way to save on the total cost of your ticket is to fly from Chicago to London in the morning. If you’re flexible enough to do this you can expect to save up to 15% on your trip compared to booking a flight in the afternoon.

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

Use this chart to determine the cheapest time to fly round-trip from Chicago to London. Price data was last updated on September 22, 2024.

Travelers seeking maximum savings on their Chicago to London flight should consider departing on Wednesday at noon 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

Explore weekly flight availability from Chicago to London. 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 LON are scheduled on a Monday (57 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (52 on average).

Rainfall in London by month

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

In terms of precipitation, rainfall in London 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 when rainfall is around 1.6 in.

Temperature in London by month

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

If weather is an important factor for your trip to London, 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 London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated June 12, 2025.
Read reviews from past customers who have flown Delta, Porter Airlines and KLM from Chicago to London. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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!
Porter Airlines
8.0
Very good
288 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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 Transat
7.8
Good
396 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

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 London. 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 round-trip?

    Icelandair, at $671, was found to be the cheapest airline from Chicago to London.Alternate airlines to your destination round-trip include Virgin Atlantic and British Airways. Icelandair is 12% cheaper than the average price of flights available within the next 90 days to this destination.

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

    $379 is the cheapest one-way deal found within the past few days, from Air Canada. You may also be able to find cheap deals on Virgin Atlantic and ITA Airways, with prices starting from $379 and $379, respectively.

  • What are the most popular routes from Chicago to London?

    The most popular route from Chicago to London is Chicago O'Hare Intl - London Heathrow. You may also consider Chicago O'Hare Intl - London Gatwick or Chicago O'Hare Intl - London City.

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

    Before booking your flight to London from Chicago, check out the most reliable airlines to get you to your destination on time: Royal Jordanian (81%), SriLankan Airlines (75%), Air Canada( 72%).

  • What are the cheapest flights from Chicago to London?

    Looking at all options, your cheapest flight can be booked for $412. While the most popular route (Chicago O'Hare Intl - London Heathrow) can be booked for $377 on average our data indicates $2,680 when flying from Chicago to London.

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

    Of the flights from Chicago to London that have layovers, most of them stop in Reykjavik. Dublin sees the next most layovers on Chicago to London flights.

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

    Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool are the most popular attractions in Reykjavik if you're in need of something to do during your layover. Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool are located about 23.2 mi, 23.3 mi, and 24.6 mi, respectively from Reykjavik Keflavik Intl. Travelers can book a car rental at Reykjavik Keflavik Intl for about $66 per day to make their sightseeing more efficient.

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

    Most Dublin visitors opt to spend their time at Molly Malone Statue, Parnell Square, and St. Patrick's Cathedral. 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 on a layover in Dublin in need of a rental car can book one at Dublin for about $24.

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

    Chicago to London flights have a layover in Lisbon least often. Lisbon is followed by Copenhagen in terms of the least popular layover location on flights from Chicago to London.

  • Can I find deals for flights from Chicago to London that include hotel bookings?

    Yes. In addition to deals on Chicago to London flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Chicago to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to London.

  • Can I find deals for business class flights from Chicago to London?

    Yes. Cheapflights offers flight deals from Chicago to London 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?

    Currently, November is the cheapest month in which you can book a flight from Chicago to London (average of $661). Flying from Chicago to London 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
Gatwick
Orpington
Watford
Croydon
Folkestone
Borehamwood
Sutton
Aylesbury
Chelmsford
Brentwood
Chichester
Wembley
Arundel

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Alternative routes for Chicago to London

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Chicago to London

Discover the top 10 airlines that operate flights from Chicago to London. 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$700FlexibilityNo cancel feeOn-time79%
DeltaCheapest$345Average$935FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$381Average$601FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$440Average$921FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$465Average$649FlexibilityNo 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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