ORD - LON

£257 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 London departing on 21/3. 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, 0 bags

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

 
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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Everything you should know

Cheapest return fare
£378
Typical prices: £463-£634
Icelandair
Fri 24/4Fri 1/5
ORD - LHR • 1 stop
Cheapest direct flights
£462
Typical prices: £471-£623
Finnair
Wed 25/2Tue 3/3
ORD - LHR • Direct
Our travellers' advice
AI-powered summary based on content written by travel experts and KAYAK users. AI can make mistakes.
Finnair's Economy Comfort offers more legroom for a fee.
Expect long walks at Heathrow to baggage claim.
Expert advice
Expert advice
+1
+1
Expert advice
Expert advice
+1
Top airlines
Icelandair
Cheapest • from £378 (return)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Top routes
ORD
-
LHR
Cheapest
ORD
-
LHR
Most popular
Insights
Insights
Insights
Insights
When to travel
February
Cheapest • 15% price drop
March
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to London!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Chicago to London (ORD-LON)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return 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 return flight deals from Chicago to London

Fri, 24 Apr - Fri, 1 May
Icelandair Logo
22:25 - 20:20
ORD
-
LHR
15h 55m
1 stop
Icelandair Logo
21:25 - 18:15
LHR
-
ORD
26h 50m
1 stop
£378Icelandair
Fri, 27 Feb - Tue, 3 Mar
Icelandair Logo
18:30 - 10:55
ORD
-
LGW
10h 25m
1 stop
Icelandair Logo
11:55 - 17:20
LGW
-
ORD
11h 25m
1 stop
£378Icelandair
Sun, 8 Mar - Tue, 17 Mar
TAP AIR PORTUGAL Logo
21:25 - 20:35
ORD
-
LGW
18h 10m
2 stops
TAP AIR PORTUGAL Logo
16:35 - 16:00
LGW
-
ORD
28h 25m
1 stop
£378TAP AIR PORTUGAL
Wed, 25 Feb - Tue, 3 Mar
Multiple Airlines Logo
18:30 - 22:50
ORD
-
STN
22h 20m
2 stops
Multiple Airlines Logo
06:30 - 17:20
STN
-
ORD
16h 50m
2 stops
£378Multiple Airlines
Tue, 21 Apr - Sat, 2 May
Icelandair Logo
19:25 - 20:20
ORD
-
LHR
18h 55m
1 stop
Icelandair Logo
13:05 - 18:15
LHR
-
ORD
11h 10m
1 stop
£378Icelandair
Fri, 24 Apr - Sat, 9 May
Icelandair Logo
19:25 - 11:55
ORD
-
LHR
10h 30m
1 stop
Icelandair Logo
21:25 - 18:15
LHR
-
ORD
26h 50m
1 stop
£379Icelandair
Tue, 5 May - Thu, 14 May
Icelandair Logo
19:25 - 14:40
ORD
-
LGW
13h 15m
1 stop
Icelandair Logo
13:00 - 18:15
LGW
-
ORD
11h 15m
1 stop
£379Icelandair
Fri, 27 Feb - Thu, 5 Mar
Multiple Airlines Logo
18:30 - 18:20
ORD
-
STN
17h 50m
2 stops
Multiple Airlines Logo
06:30 - 17:20
STN
-
ORD
16h 50m
2 stops
£380Multiple Airlines
Wed, 25 Feb - Tue, 3 Mar
SWISS Logo
18:50 - 12:55
ORD
-
LCY
12h 05m
1 stop
SWISS Logo
09:15 - 16:20
LCY
-
ORD
13h 05m
1 stop
£452SWISS
Sun, 15 Feb - Tue, 24 Feb
SWISS Logo
18:50 - 12:55
ORD
-
LCY
12h 05m
1 stop
SWISS Logo
09:15 - 16:20
LCY
-
ORD
13h 05m
1 stop
£454SWISS
Booking Insights

KAYAK's insights & trends for Chicago to London flights

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

What is the cheapest Chicago O'Hare Intl Airport to London flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest return flight from Chicago O'Hare Intl Airport to London costs £429 on the route between Chicago O'Hare Intl Airport (ORD) and London Heathrow Airport (LHR). It is also the most popular route.

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 clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Chicago to London, look for departures on Sundays and avoid leaving on a Saturday, as it's usually the priciest day. When flying back from London, Wednesday is the cheapest day to fly and Saturday is the most expensive.

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

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, 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 is February, where tickets cost £464 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £856 and £698 respectively.

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

The average return price for all direct flights, flights with one stopover, and flights with two stopovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 2 stops stopover the cheapest option at £579 on average.

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

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, 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, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 3 weeks before departure.

Expert advice

Expert advice for your flight from Chicago to London

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on Finnair

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.

Jessica Macdonald

Jessica Macdonald

Expert on Lufthansa

Currently based in Scotland after living in South Africa and the United States, Jessica has been writing travel and aviation content for more than 10 years. She regularly contributes to Travel + Leisure and TripSavvy, and has had work published by Condé Nast Traveller and The Independent. She has travelled to more than 50 countries across six continents.

Duncan Madden

Duncan Madden

Expert on British Airways

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.

Marisa Garcia

Marisa Garcia

Expert on Iberia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialising in airline interiors and regulations. 10 years ago, she pivoted to journalism. She shares her insights in leading aviation, travel and business publications and on her site, FlightChic.

Stefanie Waldek

Stefanie Waldek

Expert on ORD

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 out at sea, likely en route to Antarctica or the Arctic.

Kirstie Pickering

Kirstie Pickering

Expert on LHR

Aviation and business journalist Kirstie didn’t leave England until she was 18 years old, but has since travelled to over 20 countries including Japan, Canada, and Iceland. Her travel expertise lies in European city breaks, including how to find the best locally-owned hotels and restaurants and how to optimise the airport experience for your needs.

Good to know - Cheap tickets from Chicago to London

Low seasonJanuary
Cheapest flight£257
Best time to beat the crowds (14% less expensive on average)
Most popular time to fly and prices are also 4% lower on average.
Flight from Chicago to London Luton Airport

When to book flights from Chicago to London

Are your dates flexible? Find out the best times to travel from Chicago to London based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns 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 London: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Chicago to London 
Verified travelerFlew with British Airways
ORD
-
LHR
Jun 2025
Get a wheel chair if you have difficulty walking
JoeFlew with Iberia
ORD
-
LHR
Apr 2025
Get there early. Nice airport options while you wait.
Verified travelerFlew with Iberia
ORD
-
LHR
May 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 Airlines
ORD
-
LHR
Jan 2025
Anticipate delays, prepare for long walks through Heathrow to baggage claim or for connections.
KariFlew with British Airways
ORD
-
LHR
May 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 Airlines
ORD
-
LHR
Dec 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?

    In the last 3 days, the lowest price for a flight from Chicago O'Hare Intl Airport to London was £257 for a one-way ticket and £378 for a return.

  • Which airports will I be using when flying from Chicago to London?

    When flying out of Chicago you will be using Chicago O'Hare Intl. You will be landing at one of these airports: London City, London Gatwick, London Heathrow, London Luton, or London Stansted.

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

    All the following airlines offer inflight Wi-Fi service on the Chicago to London flight route: British Airways, Iberia, Finnair, American Airlines, Alaska Airlines, SWISS, and United Airlines.

  • 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?

    Star Alliance, and oneworld are the airline alliances operating flights between Chicago and London, with Star Alliance 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.

  • Which is the best airline for flights from Chicago to London, United Airlines or Iberia?

    The two airlines most popular with KAYAK users for flights from Chicago to London are United Airlines and Iberia. With an average price for the route of £675 and an overall rating of 7.4, United Airlines is the most popular choice. Iberia is also a great choice for the route, with an average price of £488 and an overall rating of 7.0.

  • 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 return 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

  • Looking for a cheap flight from London to Chicago? 25% of our users found flights on this route for £289 or less one-way and £482 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.
Find which airlines fly direct from Chicago O'Hare Intl Airport to London, which days they fly and book direct flights.

Direct departures

Chicago O'Hare Intl to London

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

Aer Lingus, American Airlines, British Airways, +1 more

Aer Lingus, American Airlines, +2 more

Saturday

Aer Lingus, American Airlines, British Airways, +1 more

Aer Lingus, American Airlines, +2 more

Sunday

Aer Lingus, American Airlines, British Airways, +1 more

Aer Lingus, American Airlines, +2 more

See more direct flights

Direct returns

London 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 direct flights

Reviews of the top 3 airlines flying from Chicago to London

 
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 London? 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.
7.4
United AirlinesOverall score based on 9215 reviews
7.3Comfort
8.1Crew
6.6Food
7.7Boarding
7.1Entertainment
Airline reviews

In overall it was a good experience, the only down point was that the entertainment screen was working properly.

8.0 ExcellentAnonymous, Jan 2026
ORD - TPA
Read more United Airlines reviews

In overall it was a good experience, the only down point was that the entertainment screen was working properly.

Some flight attendants were great others were cranky. Seats were very tight and sitting on an aisle was very hard as the carts and people walking constantly bumped shoulder and arm.

They lost my luggage, so, not happy. The crew was nice but my suitcases never made it, still trying to find out what happened!

I understand weather is an issue, but making us chase our plane down at five scheduled gates across three terminals in an airport the size of O'Hare was unfair. They'd have probably been better off to leave gates as TBD until the inbound plane is in final approach instead of running us all over the place. Also, props to the consistently-unprepared ground crew in Richmond for once again leaving my lane parked short of the gate because they couldn't have a crew in place on time with 2 hours notice...

cabin crew was OK, food was OK, the trip from the US to Munich was actually pretty bad comfort wise. Noisy aircraft, lights never dimmed even in Business class (night flight) barely sufficient amenities for the price. I have millions of miles with United but TBH American is gaining ground and Delta has always been marginally better then United although on paper United has more longes and cheaper upgrades.

Essy to get on. The hostess gave very little pop, the plane was late getting in, and we are still waiting for our bags. This sucks. :/

Not United Airlines' fault. It's ORL airport's fault.

Great flight. On time boarding. Smooth flight and on time arrival at EWR. The flight crew was marvelous and there was a great selection of movies on the entertainment system. Our bags were at the carousel before we got there. Another excellent flight from United.

I liked the snacks and the flight attendants were friendly.

The movies offered were great. Staff were very pleasant and very efficient.

The boarding procedure got confusing because they wanted to weigh everyone’s carry-on. Apparently mine was 3 1/2 kg over their limit. I didn’t know they had a limit. And at the check-in desk, nothing was said about this. They wanted me to check the carry-on at no charge and that would have been fine except then they told me at my connection in London I would have to go outside to baggage claim retrieve my bag, and then recheck it. In other words, they could not check it to my final destination, only to London. I told him this was unacceptable so after a few minutes of discussion, they came back and said that my bag would be OK to carry on the plane. It seems that if you have a connection then the weight is not as important. Then when I actually went to board the boarding agent said I needed a tag indicating that my bag had been weighed, even though she had just five minutes ago talked to the same person who cleared me. Lots of confusion seems like a very bad process. They need to improve this.

My flight being automatically moved messed up my travel plans, and I had to quickly find an alternative mode of transportation. I couldn’t get a refund from any of the companies involved. Kayak, Ibiza, or Vueling. I am still unsure of how to settle my concern.

Plane delayed due to weather. Plane boarded, then told to unboard due to a maintenance issue.

the seats were so cramped you could barely move. it was difficult to eat when passengers would recline their seats. the seats were so flimsy and unstable that whenever someone got in and out of their seat, it bounced like a spring back in your face. the movies were nice. the food was terrible. even though the conditions were terrible, they tried to pressure passengers to relocate their seats to accommodate adults who were related and wanted to sit next to each other, even after the passengers expressed that they did not want to move for that purpose. on the connecting flight, the “service” consisted of items for purchase. even though the flight was only 45 minutes, once again passengers (including me) were pressured to relocate for people to sit next to each other. they couldn’t be apart for 45 minutes? this was much less compelling than being apart for an 8 hour flight.

Everything went smoothly, and we even arrived 40min earlier than scheduled, on an Orland-Madrid route.

The staff was very nice and helpful. Some of the best crew I have met.

Suddenly, I don't find my flight back on the app Help Ticket 0757345716866 Hoeflich Flight back Sunday ib5333 Ib2629 Ib4268

Was all good.l including a sofdrink. AA improved significantly. There was no entertainment.

I've taken British Airways before and it has been great. On this trip to Spain and Portugal we had two BA flights. On both flights we were taken by bus from the terminal out to the plane on the tarmac. There were many older folks on these flights, and to ask people in their 70s to lug their carry-on and personal items up the long mobile staircase to the plane entrance, is very disturbing. I won't be taking British Airways in the future. Many people on these flights were very unhappy.

The food on the flight was of marginal quality. Small bits of chicken, instant mashed potatoes and some carrots. The rolls were very dry, nearly inedible. The seats were quite small and didn’t allow for any shifting of position during the flight. There was limited leg room.0

The issue was not with BA it was with the link yoiu sent fopr booking the flight

Loved the boarding option from Business class lounge, experience on flight was excellent, plenty of good food choices

The airline was not clear about a new departure time so we got to the airport early anyway. The flight left early which was great because of weather. The check in process was very easy and staff were friendly and helpful. The crew was great and our flight was very good.

Awful it always is unfortunately is the only way to fly direct to london

I travelled in business class and was disappointed by lack of service, curt and borderline rude time of the crew and to top it off, all of my luggage was delayed. It was like pulling teeth to even report the missing luggage and recover it the next day from the airport.

Boarding was poor. All groups called immediately one after the other resulting in a long queue in the jetty/jet bridge. Seats were very hard and and did not recline on a 4.5 hour flight. No food was available. Plane was cold. There was no entertainment.

The cramped seats are cruel and unusual punishment and may violate the Geneva code.

Check in was was and the agent was very friendly and helpful The lounge was nice...boarding was straight from the lounge Everything worked at our seats, and video entertainment was good ..food was mediocre

The flight was excellent in World Travellor plus. Well worth the extra money. Boarding at Phoenix was the usual poorly organized event. Very stressful.

Although business class, the seating was really cramped. The food was so so.

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

Information on your arrival and departure airports