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$228+ 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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — LON
Aug 26 — Sep 21
Tue 8/26
Tue 9/2
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to London are usually found in February or September, booked 83 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

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 August 21, 2025.

Round-trip from

$503
(oojo)

One-way from

$228
(oojo)

Popular in

June

Cheapest in

February

Average price

$713

Good round-trip deal

$572 or less

Good one-way deal

$388 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 ($203 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Chicago (CHI) to London (LON).
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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 August 21, 2025.

This oojo deal was found by Cheapflights users on 8/20. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/197:25 pmORD - LHR
1 stop10h 30mIcelandair
Tue 9/309:25 pmLHR - ORD
1 stop29h 50mIcelandair
Deal found 8/20$503
This Mytrip deal was found by Cheapflights users on 8/20. 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.
Wed 9/37:25 pmORD - LGW
1 stop10h 20mIcelandair
Fri 9/123:40 pmLGW - ORD
1 stop32h 35mIcelandair
Deal found 8/20$503
This oojo deal was found by Cheapflights users on 8/21. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/287:25 pmORD - LHR
1 stop18h 55mIcelandair
Sun 10/129:25 pmLHR - ORD
1 stop26h 50mIcelandair
Deal found 8/21$504
This Gotogate deal was found by Cheapflights users on 8/21. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/77:25 pmORD - LGW
1 stop13h 15mIcelandair
Tue 9/163:40 pmLGW - ORD
1 stop32h 35mIcelandair
Deal found 8/21$504
This oojo deal was found by Cheapflights users on 8/21. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/227:25 pmORD - LHR
1 stop10h 30mIcelandair
Sun 10/59:25 pmLHR - ORD
1 stop26h 50mIcelandair
Deal found 8/21$505
This oojo deal was found by Cheapflights users on 8/20. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1110:15 pmORD - LGW
1 stop10h 25mIcelandair
Wed 9/173:35 pmLGW - ORD
1 stop11h 40mIcelandair
Deal found 8/20$505
This oojo deal was found by Cheapflights users on 8/20. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/227:25 pmORD - LHR
1 stop10h 30mIcelandair
Tue 9/309:25 pmLHR - ORD
1 stop26h 50mIcelandair
Deal found 8/20$506
This Iberia deal was found by Cheapflights users on 8/21. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/294:30 pmORD - LGW
1 stop12h 25mIberia
Tue 10/710:40 amLGW - ORD
1 stop14h 55mIberia
Deal found 8/21$506
This FlightHub deal was found by Cheapflights users on 8/19. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/217:15 pmORD - LHR
1 stop17h 15mScandinavian Airlines
Thu 10/306:40 amLHR - ORD
1 stop17h 05mScandinavian Airlines
Deal found 8/19$507
This oojo deal was found by Cheapflights users on 8/21. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/127:25 pmORD - LGW
1 stop13h 15mIcelandair
Wed 9/173:35 pmLGW - ORD
1 stop11h 40mIcelandair
Deal found 8/21$507
This FlightHub deal was found by Cheapflights users on 8/20. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/207:15 pmORD - LHR
1 stop32h 05mScandinavian Airlines
Mon 10/276:05 pmLHR - ORD
2 stops56h 00mScandinavian Airlines
Deal found 8/20$508
This oojo deal was found by Cheapflights users on 8/21. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/97:25 pmORD - LGW
1 stop13h 15mIcelandair
Thu 9/183:40 pmLGW - ORD
1 stop32h 35mIcelandair
Deal found 8/21$508

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 August 21, 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 - LGW

ORDLGW

Chicago O'Hare Intl

Sat 9/20

7:25 pm-2:35 pm

1 stop13h 10m

London Gatwick

Tue 9/30

3:40 pm-6:15 pm

1 stop32h 35m

$504

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Fri 9/19

7:25 pm-2:40 pm

1 stop13h 15m

London Gatwick

Tue 9/30

3:40 pm-6:15 pm

1 stop32h 35m

$504

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 9/20

7:25 pm-11:55 am

1 stop10h 30m

London Heathrow

Tue 9/30

9:25 pm-9:15 pm

1 stop29h 50m

$505

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Thu 10/2

7:25 pm-2:40 pm

1 stop13h 15m

London Gatwick

Sun 10/19

3:40 pm-6:15 pm

1 stop32h 35m

$505

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 9/19

7:25 pm-11:55 am

1 stop10h 30m

London Heathrow

Tue 9/30

9:25 pm-6:15 pm

1 stop26h 50m

$508

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 9/19

7:25 pm-11:55 am

1 stop10h 30m

London Heathrow

Tue 9/23

9:25 pm-9:15 pm

1 stop29h 50m

$512

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 9/21

10:35 pm-12:15 pm

Nonstop7h 40m

London Heathrow

Wed 10/1

3:50 pm-2:15 pm

1 stop28h 25m

$513

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Mon 10/27

8:20 pm-6:15 pm

2 stops16h 55m

London Luton

Sun 11/9

2:35 pm-4:45 pm

2 stops32h 10m

$515

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 11/5

9:45 pm-11:35 am

Nonstop7h 50m

London Heathrow

Wed 11/12

12:35 pm-3:25 pm

Nonstop8h 50m

$516

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Tue 10/7

7:25 pm-2:40 pm

1 stop13h 15m

London Gatwick

Mon 11/3

11:55 am-5:20 pm

1 stop11h 25m

$518

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/21

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 August 8, 2025.

The best time to book flights from Chicago to London is 83 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 $1,097). 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 August 21, 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 19% 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 August 21, 2025.

The most flights from CHI to LON are scheduled on a Wednesday (57 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (50 on average).

How much does it cost to fly round-trip from Chicago to London?

What’s the top layover airport for flights from Chicago to London?

Share of 1-stop round-trip flights from Chicago to London chosen by Cheapflights users in the past 12 months, using the same layover each way.

Reykjavik (KEF) – chosen by Cheapflights users on 59% of 1-stop itineraries from Chicago to London on Cheapflights.

What’s the cheapest layover airport for flights from Chicago to London?

Average round-trip fare for 1-stop flights from Chicago to London, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Reykjavik (KEF) is the most affordable 1-stop option, with an average round-trip price of $482.

What’s the fastest layover option from Chicago to London?

Shortest average travel time for 1-stop one-way flights from Chicago to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Amsterdam (AMS) have the shortest average one-way travel time for 1-stop routes: 9h 45m.

Which airport typically offers the quickest layover for flights from Chicago to London?

Average layover duration for 1-stop one-way flights from Chicago to London, 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 layover time of 1h 09m.

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 August 21, 2025.
See what other customers who have flown with United Airlines, American Airlines, and Icelandair from Chicago to London have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,930 reviews

Entertainment

7.1

Comfort

7.3

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,930 reviews
United Airlines
7.4
Good
8,930 reviews

Entertainment

7.1

Comfort

7.3

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,930 reviews

Entertainment

7.1

Comfort

7.3

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Icelandair
7.0
Good
529 reviews
United Airlines
7.4
Good
8,930 reviews

Entertainment

7.1

Comfort

7.3

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Iberia
7.0
Good
2,884 reviews
United Airlines
7.4
Good
8,930 reviews

Entertainment

7.1

Comfort

7.3

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
British Airways
6.7
Okay
7,291 reviews
United Airlines
7.4
Good
8,930 reviews

Entertainment

7.1

Comfort

7.3

Food

6.6

Boarding

7.7

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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.

  • How long is the flight from Chicago to London?

    Departing from Chicago to London will take you 7h 40m. There are 3939 mi between Chicago and London. This flight may include one or multiple stops.

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

    JetBlue, at $51, was found to be the cheapest airline from Chicago to London.Alternate airlines to your destination round-trip include SWISS and Scandinavian Airlines. JetBlue is 93% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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: Air Canada (63%), Austrian Airlines (63%), United Airlines( 63%).

  • What are the cheapest flights from Chicago to London?

    Looking at all options, your cheapest flight can be booked for $372. While the most popular route (Chicago O'Hare Intl - London Heathrow) can be booked for $371 on average our data indicates $2,504 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. Copenhagen 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?

    Harpa, Hallgrímskirkja, and Laugardalslaug Geothermal Pool are the most popular attractions in Reykjavik if you're in need of something to do during your layover. Harpa, Hallgrímskirkja, and Laugardalslaug Geothermal Pool are located about 23.3 mi, 23.2 mi, and 24.6 mi, respectively from Reykjavik Keflavik Intl. Travelers can book a car rental at Reykjavik Keflavik Intl for about $63 per day to make their sightseeing more efficient.

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

    Most Copenhagen visitors opt to spend their time at Tivoli, Rådhuspladsen, and Kongens Nytorv. Tivoli, Rådhuspladsen and Kongens Nytorv are located about 5.3 mi, 5.2 mi, and 5.1 mi, respectively from Kastrup Copenhagen if you are interested in checking them out. Those on a layover in Copenhagen in need of a rental car can book one at Kastrup Copenhagen for about $69.

  • 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 Dublin 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 $1,097). 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 London?

Book flights to London if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Southend-on-Sea
Harrow
Canterbury
Croydon
Dartford
Dover
Orpington
Gatwick
Borehamwood
Aylesbury
Chelmsford
Bedford
Folkestone
Chichester
Arundel
Eastbourne
Milton Keynes

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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 August 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$632FlexibilityNo cancel feeOn-time62%
SWISSCheapest$257Average$723FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$338Average$591FlexibilityNo cancel feeOn-time77%
DeltaCheapest$345Average$909FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$400Average$917FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$469Average$654FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$502Average$793FlexibilityNo cancel feeOn-time70%
TAP AIR PORTUGALCheapest$508Average$797FlexibilityNo cancel feeOn-timeN/A
Aer LingusCheapest$553Average$821FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$568Average$760FlexibilityNo cancel feeOn-time76%

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Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.