ORD - LHR

C$ 378 Find Cheap Flights from Chicago to London

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Chicago to Heathrow departing on 8/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Chicago to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Chicago to London, as well as popular online travel agencies
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Booking Insights
Flight Deals

Cheap Flights from Chicago to London (ORD-LHR)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Chicago to London that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Chicago to Heathrow

Sun, 28 Sep - Wed, 15 Oct
United Airlines Logo
4:00 p.m. - 6:20 a.m.ORD-LHR
8h 20mdirect
United Airlines Logo
6:50 a.m. - 12:05 p.m.LHR-ORD
11h 15m1 stop
C$ 700United Airlines
Find Deal
Wed, 24 Sep - Thu, 23 Oct
United Airlines Logo
9:50 p.m. - 11:45 a.m.ORD-LHR
7h 55mdirect
United Airlines Logo
6:50 a.m. - 12:05 p.m.LHR-ORD
11h 15m1 stop
C$ 701United Airlines
Find Deal
Tue, 30 Sep - Tue, 7 Oct
United Airlines Logo
9:25 p.m. - 11:45 a.m.ORD-LHR
8h 20mdirect
United Airlines Logo
6:50 a.m. - 12:05 p.m.LHR-ORD
11h 15m1 stop
C$ 702United Airlines
Find Deal
Thu, 4 Dec - Mon, 8 Dec
Scandinavian Airlines Logo
7:20 p.m. - 12:55 p.m.ORD-LHR
59h 35m2 stops
Scandinavian Airlines Logo
6:40 a.m. - 4:45 p.m.LHR-ORD
16h 05m1 stop
C$ 704Scandinavian Airlines
Find Deal
Sun, 9 Nov - Thu, 20 Nov
Delta Logo
2:30 p.m. - 8:45 a.m.ORD-LHR
12h 15m1 stop
Delta Logo
6:20 a.m. - 3:10 p.m.LHR-ORD
14h 50m1 stop
C$ 711Delta
Find Deal
Sun, 28 Sep - Wed, 15 Oct
Delta Logo
7:00 a.m. - 6:25 a.m.ORD-LHR
17h 25m1 stop
Delta Logo
9:00 a.m. - 3:00 p.m.LHR-ORD
12h 00m1 stop
C$ 712Delta
Find Deal
Thu, 19 Feb - Tue, 3 Mar
Icelandair Logo
6:30 p.m. - 10:50 a.m.ORD-LHR
10h 20m1 stop
Icelandair Logo
12:15 p.m. - 5:20 p.m.LHR-ORD
11h 05m1 stop
C$ 723Icelandair
Find Deal
Fri, 3 Oct - Wed, 15 Oct
Icelandair Logo
7:25 p.m. - 11:55 a.m.ORD-LHR
10h 30m1 stop
Icelandair Logo
1:05 p.m. - 6:15 p.m.LHR-ORD
11h 10m1 stop
C$ 725Icelandair
Find Deal
Tue, 18 Nov - Mon, 24 Nov
Scandinavian Airlines Logo
10:30 a.m. - 4:00 p.m.ORD-LHR
23h 30m2 stops
Scandinavian Airlines Logo
10:20 a.m. - 4:45 p.m.LHR-ORD
12h 25m1 stop
C$ 740Scandinavian Airlines
Find Deal
Fri, 7 Nov - Sun, 9 Nov
Lufthansa Logo
9:50 p.m. - 3:50 p.m.ORD-LHR
12h 00m1 stop
Lufthansa Logo
1:30 p.m. - 8:05 p.m.LHR-ORD
12h 35m1 stop
C$ 741Lufthansa
Find Deal

Everything you should know

Our travellers' advice
AI-generated summary based on content written by travel experts and KAYAK users
Security lines at O'Hare can be long; arrive early.
Expect long walks at Heathrow; consider a wheelchair.
Expert advice
Expert advice
+1
+1
Expert advice
Expert advice
+1
Top airlines
United Airlines
Cheapest • from C$ 700 (round-trip)
British Airways
Best reviews • 6.6 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
February
Cheapest • 15% price drop
October
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
C$ 700
Typical prices: C$ 892-1218
United Airlines
Sun 28/9Wed 15/10
ORD - LHR • Direct
Cheapest direct flights
C$ 715
Typical prices: C$ 898-1235
United Airlines
Mon 29/9Tue 7/10
ORD - LHR • Direct
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KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Heathrow!
Expert advice

Expert advice for your flight from Chicago to Heathrow

 
Snippets provided in this section are AI-generated based on a summarisation of KAYAK-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.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airports
ORD

Security lines at O'Hare can be long during peak times. Arrive early to avoid delays, especially for international flights.

Read more about ORDby Stefanie Waldek
LHR

For a quick trip to central London, take the Heathrow Express from Paddington. It's fast but pricey; consider the Elizabeth Line for a cheaper option.

Read more about LHRby Duncan Madden
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on ORD

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Duncan Madden

Duncan Madden

Expert on LHR

Duncan Madden

Duncan Madden

Duncan is a freelance travel writer, copywriter and book author in constant search of travel stories and the perpetual sensation of being on holiday. He’s never happier than when on a dusty trail in search of empty waves or ducking under the piste tape in search of snowbound solitude. British born, living in Germany, but happiest heading for the horizon. His first book, Found in Translation, explores the etymologies and stories of country names around the world and is out now.

Read more
Booking Insights

KAYAK's insights & trends for Chicago to Heathrow flights

Get data-powered insights and trends into flights from Chicago to Heathrow to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Chicago O'Hare Intl Airport to London Heathrow Airport?

What’s the cheapest day of the week to fly from Chicago to London?

The average price of all round-trip flights from Chicago O'Hare Intl Airport to London Heathrow Airport clicked on KAYAK for each day over the last 12 months.

For Chicago to London, Monday is the cheapest day to fly on average and Tuesday is the most expensive. Flying from London back to Chicago, the best deals are generally found on Saturday, with Tuesday being the most expensive.

What is the cheapest month to fly from Chicago O'Hare Intl Airport to London Heathrow Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Chicago O'Hare Intl Airport to London Heathrow Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Chicago O'Hare Intl Airport to London Heathrow Airport is February, where tickets cost C$ 931 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is C$ 1,721 and C$ 1,338 respectively.

Can I save money by flying with a layover from Chicago O'Hare Intl Airport to London Heathrow Airport?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of C$ 1,031, prices are generally cheapest when you fly direct.

How far in advance should I book a flight from Chicago O'Hare Intl Airport to London Heathrow Airport?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Chicago O'Hare Intl Airport to London Heathrow Airport, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Chicago O'Hare Intl Airport to London Heathrow Airport, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 3 weeks before departure.

Find deals

Good to know

Low seasonFebruary
Cheapest flightC$ 378
Best time to beat the crowds (16% less expensive on average)
Most popular time to fly and prices are also 14% lower on average.
Flight from Chicago to London

When to book flights from Chicago to Heathrow

Are your dates flexible? Find out the best times to travel from Chicago to Heathrow based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Flights from Chicago to Heathrow: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Chicago to Heathrow 
Learn how KAYAK collects reviews and tips from users.
Verified travelerFlew with British AirwaysJun 2025
Get a wheel chair if you have difficulty walking
JoeFlew with IberiaApr 2025
Get there early. Nice airport options while you wait.
Verified travelerFlew with IberiaMay 2025
Get to the airport early so you’re relaxed. Con yourself into believing it’s bedtime and try to sleep so that you can keep going all day when you get there. If you can afford more comfy seats it might be worth it - though I always have the cheap ones so I can’t say for sure. Try very hard not to. sit in the middle. I’m small and the guy next to me played games all night and didn’t care that he continually ( with every move) jabbed me with his arm. This was my first flight with Cheap Flights and it was far less convenient than other times I’ve flown overseas.
DinaFlew with United AirlinesJan 2025
Anticipate delays, prepare for long walks through Heathrow to baggage claim or for connections.
KariFlew with British AirwaysMay 2024
Always check to confirm your assistance is in system. No wheelchair waiting for me in London. Had no clue about airport or how to get around. Got lost easy
AaronFlew with American AirlinesDec 2023
Find a flight where you are allowed to choose your seats before the day of boarding for anything international.

FAQs for booking Chicago to London flights

  • What is the cheapest flight from Chicago O'Hare Intl Airport to London Heathrow Airport?

    In the last 3 days, the lowest price for a flight from Chicago O'Hare Intl Airport to London Heathrow Airport was C$ 273 for a one-way ticket and C$ 505 for a round-trip.

  • Which airlines offer Wi-Fi service onboard planes from Chicago to London?

    British Airways, Iberia, American Airlines, Finnair, and Alaska Airlines offer inflight Wi-Fi service on the Chicago to London flight route.

  • Which aircraft models fly most regularly from Chicago to London?

    The Boeing 787-9 Dreamliner is the aircraft model that flies most regularly on the Chicago to London flight route.

  • Which airline alliances offer flights from Chicago to London?

    oneworld, and Star Alliance are the airline alliances operating flights between Chicago and London, with oneworld being the most commonly used for this route.

  • On which days can I fly direct from Chicago to London?

    There are direct flights from Chicago to London on a daily basis.

  • How does KAYAK find such low prices on flights from Chicago to London?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Chicago to London.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Chicago to London?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Chicago is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Chicago to London?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London with an airline and back to Chicago with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Chicago to London?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from Chicago up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Chicago O'Hare Intl Airport to London Heathrow Airport

  • Looking for a cheap flight? 25% of our users found flights on this route for C$ 1,031 or less round-trip.

Prefer to fly direct from Chicago to London?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Chicago O'Hare Intl to London Heathrow.
Find which airlines fly direct from Chicago O'Hare Intl Airport to London Heathrow Airport, which days they fly and book direct flights.

Direct departures

Chicago O'Hare Intl to London Heathrow

Monday

American Airlines,British Airways,United Airlines

American Airlines,British Airways, +1 more

Tuesday

American Airlines,British Airways,United Airlines

American Airlines,British Airways, +1 more

Wednesday

American Airlines,British Airways,United Airlines

American Airlines,British Airways, +1 more

Thursday

American Airlines,British Airways,United Airlines

American Airlines,British Airways, +1 more

Friday

American Airlines,British Airways,United Airlines

American Airlines,British Airways, +1 more

Saturday

American Airlines,British Airways,United Airlines

American Airlines,British Airways, +1 more

Sunday

American Airlines,British Airways,United Airlines

American Airlines,British Airways, +1 more

See more nonstop flights

Direct returns

London Heathrow to Chicago O'Hare Intl

Monday

American Airlines,British Airways,United Airlines

American Airlines,British Airways, +1 more

Tuesday

American Airlines,British Airways,United Airlines

American Airlines,British Airways, +1 more

Wednesday

American Airlines,British Airways,United Airlines

American Airlines,British Airways, +1 more

Thursday

American Airlines,British Airways,United Airlines

American Airlines,British Airways, +1 more

Friday

American Airlines,British Airways,United Airlines

American Airlines,British Airways, +1 more

Saturday

American Airlines,British Airways,United Airlines

American Airlines,British Airways, +1 more

Sunday

American Airlines,British Airways,United Airlines

American Airlines,British Airways, +1 more

See more nonstop flights

Reviews of the top airline flying from Chicago to Heathrow

 
See real verified KAYAK customer reviews for airlines flying from Chicago to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Chicago to Heathrow? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
6.6
British AirwaysOverall score based on 7361 reviews
7.6Crew
6.4Entertainment
6.9Boarding
6.7Comfort
6.3Food
Airline reviews

The seating has become ridiculous… like a contest to see how narrow and short they can be made- forcing anyone over 5’1 to pay more to not be twisting oneself into a pretzel. Really insane- would have thought BA was better than this. Frankly- it cancels out a lot of the positive aspects.

4.0 OkayAnonymous, Sep 2025BOS - LHR
Read more British Airways reviews

The seating has become ridiculous… like a contest to see how narrow and short they can be made- forcing anyone over 5’1 to pay more to not be twisting oneself into a pretzel. Really insane- would have thought BA was better than this. Frankly- it cancels out a lot of the positive aspects.

flight was delayed from BWI to London - missed my connecting flight & then connecting flight (also British Air) was delayed - food is awful, TV & movie selection is great

Super tight economy class. My knees were hitting the back of seat in front of me (I'm only 5'6"). My small backpack (sized according to their required dimensions) would not fit under the seat in front of me because there is a box (is that the life jacket?) in the way. Over all, extremely uncomfortable. I forgive the tasteless food, but the tight seating was torture

Didn’t fly with them as someone had cancelled my flight

Online check-in 24 hours in advance something seems not so easy to check in to pick seats and to print a boarding pass

I like the crew, very welcoming. Food can be better. The seat arms don’t go up so. I could use the empty seat next to mine to relax better. 3hrs delay 😠

Boarding was efficient and quick, crew was very attentive, seats were comfortable.

Everything was very good! I personally struggled with the heat in the cabin for the first 2 hours

Very caring crew on board. Didn’t have dinner as I was sleeping. Was seating in the emergency row so I had comfortable leg room

Had a nice little suite although I couldn’t close the door (but I didn’t ask anyone to help). 5K is a nice seat and very private (you look in on first class). Enjoyable flight and nice crew.

Everything you need to know for your flight from Chicago to Heathrow

Information on your arrival and departure airports

Chicago (ORD)
Heathrow (LHR)

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