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$504+ Cheap flights from Chicago (CHI) to London, ON (YXU)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/25. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — YXU
Jan 20 — Jan 271
Tue 1/20
Tue 1/27
1 adult, Economy
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Cheap 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 December 21, 2025.

This Air Canada deal was found by Cheapflights users on 12/19. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/292:00 pmORD - YXU
1 stop6h 21mAir Canada
Sat 1/35:10 amYXU - ORD
1 stop5h 03mAir Canada
Deal found 12/19$974
This United Airlines deal was found by Cheapflights users on 12/19. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/298:51 amORD - YXU
2 stops11h 30mUnited Airlines
Sat 1/35:10 amYXU - ORD
2 stops10h 05mUnited Airlines
Deal found 12/19$999
This United Airlines deal was found by Cheapflights users on 12/19. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2111:15 amORD - YXU
1 stop4h 50mUnited Airlines
Fri 12/265:40 pmYXU - ORD
1 stop5h 25mUnited Airlines
Deal found 12/19$1,437

Find 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 (YXU). 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 December 21, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$342
(oojo)
Provider with most accurate pricing for Chicago (CHI)-London flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-London flights.
Search Deals
From Chicago (CHI) to London
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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 December 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 - YXU

ORDYXU

Chicago O'Hare Intl

Mon 5/25

5:30 pm-1:45 pm

2 stops19h 15m

London

Thu 5/28

8:00 pm-8:25 pm

2 stops25h 25m

$504

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Sat 5/23

5:30 pm-7:07 pm

1 stop24h 37m

London

Tue 5/26

6:00 am-4:43 pm

1 stop11h 43m

$537

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Mon 5/25

5:30 pm-7:07 pm

1 stop24h 37m

London

Thu 5/28

8:00 pm-4:43 pm

1 stop21h 43m

$537

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Tue 2/3

7:15 am-5:05 pm

2 stops8h 50m

London

Tue 2/10

9:25 am-1:01 pm

1 stop4h 36m

$540

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Tue 2/3

10:00 am-6:35 am

3 stops19h 35m

London

Tue 2/10

8:10 pm-9:13 am

2 stops14h 03m

$615

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Thu 1/22

2:00 pm-9:21 pm

1 stop6h 21m

London

Mon 1/26

5:10 am-9:13 am

1 stop5h 03m

$633

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Sun 1/4

8:40 pm-8:46 am

1 stop11h 06m

$518

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Sun 1/4

10:49 pm-6:34 am

3 stops54h 45m

$538

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/19

Compare providers for flights from Chicago to London

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Chicago to London in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Chicago-London, Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Chicago-London, Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Chicago-London, Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Chicago-London, Ontario flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Chicago-London, Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

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

Currently, October is the cheapest month in which you can book a flight from Chicago to London, Ontario (average of $85). Flying from Chicago to London, Ontario in December is currently the most expensive (average of $217). 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.

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 airport do you fly into for flights to London from Chicago?

    Located just 5.3 mi from the city center, London is the airport most travelers will use when flying to London from Chicago. Booking flights from Chicago to London (YXU) should be relatively easy as there are 0 daily inbound flights from Chicago from 0 different airlines.

  • How long is the flight from Chicago to London, Ontario?

    For as low as $540, WestJet can have you in London, Ontario from Chicago in 8h 50m. There are 351 mi between Chicago and London, Ontario. This flight may include one or multiple stops.

  • 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, Ontario?

    Currently, October is the cheapest month in which you can book a flight from Chicago to London, Ontario (average of $85). Flying from Chicago to London, Ontario in December is currently the most expensive (average of $217). 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
Grand Bend

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