$238 Find Cheap Flights from Chicago to the United Kingdom - Compare and Save

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 the United Kingdom departing on 9/22. 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.
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Cheap Flights from Chicago to the United Kingdom

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
London
London2 stops$673
Edinburgh
Edinburgh2 stops$842
Manchester
Manchester1 stop$645
Birmingham
Birmingham2 stops$550
Inverness
Inverness1 stop$786
Bristol
Bristol2 stops$812
Cardiff
Cardiff2 stops$984
London
London2 stops$673
Edinburgh
Edinburgh2 stops$842
Manchester
Manchester1 stop$645
Birmingham
Birmingham2 stops$550
Inverness
Inverness1 stop$786
Bristol
Bristol2 stops$812
Cardiff
Cardiff2 stops$984

Book Cheap Chicago to the United Kingdom Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Chicago to the United Kingdom 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 the United Kingdom

Sun, Sep 13 - Wed, Sep 23
Multiple Airlines Logo
7:25 pm - 11:40 amORD  Chicago O'Hare Intl-MAN Manchester
10h 15m1 stop Reykjavik Keflavik Intl
Multiple Airlines Logo
4:00 pm - 5:50 pmMAN  Manchester-ORD Chicago O'Hare Intl
31h 50m2 stops Riga Intl Helsinki-Vantaa
$645Multiple Airlines
Mon, Nov 2 - Mon, Nov 9
Multiple Airlines Logo
6:30 pm - 10:45 amORD  Chicago O'Hare Intl-MAN Manchester
10h 15m1 stop Reykjavik Keflavik Intl
Multiple Airlines Logo
7:45 am - 6:15 pmMAN  Manchester-ORD Chicago O'Hare Intl
16h 30m2 stops Gdansk Rebiechowo Reykjavik Keflavik Intl
$653Multiple Airlines
Sun, Oct 4 - Wed, Oct 14
Icelandair Logo
7:25 pm - 1:25 pmORD  Chicago O'Hare Intl-GLA Glasgow Intl
12h 00m1 stop Reykjavik Keflavik Intl
Icelandair Logo
2:20 pm - 6:15 pmGLA  Glasgow Intl-ORD Chicago O'Hare Intl
9h 55m1 stop Reykjavik Keflavik Intl
$655Icelandair
Wed, Oct 28 - Wed, Nov 4
Icelandair Logo
7:30 pm - 9:55 amORD  Chicago O'Hare Intl-GLA Glasgow Intl
9h 25m1 stop Reykjavik Keflavik Intl
Icelandair Logo
11:35 am - 5:20 pmGLA  Glasgow Intl-ORD Chicago O'Hare Intl
11h 45m1 stop Reykjavik Keflavik Intl
$655Icelandair
Tue, Dec 8 - Mon, Dec 21
British Airways Logo
9:50 pm - 4:30 pmORD  Chicago O'Hare Intl-MAN Manchester
12h 40m1 stop London Heathrow
British Airways Logo
9:40 am - 6:45 pmMAN  Manchester-ORD Chicago O'Hare Intl
15h 05m1 stop London Heathrow
$660British Airways
Tue, Dec 8 - Mon, Dec 21
British Airways Logo
9:50 pm - 4:30 pmORD  Chicago O'Hare Intl-MAN Manchester
12h 40m1 stop London Heathrow
British Airways Logo
11:50 am - 6:45 pmMAN  Manchester-ORD Chicago O'Hare Intl
12h 55m1 stop London Heathrow
$673British Airways
Fri, Nov 13 - Mon, Nov 16
Scandinavian Airlines Logo
7:15 pm - 8:55 amORD  Chicago O'Hare Intl-LHR London Heathrow
31h 40m2 stops Kastrup Copenhagen Stockholm Arlanda
Scandinavian Airlines Logo
6:40 am - 4:45 pmLHR  London Heathrow-ORD Chicago O'Hare Intl
16h 05m1 stop Kastrup Copenhagen
$673Scandinavian Airlines
Thu, Oct 29 - Sun, Nov 1
Scandinavian Airlines Logo
8:15 pm - 12:55 pmORD  Chicago O'Hare Intl-LHR London Heathrow
35h 40m2 stops Kastrup Copenhagen Stockholm Arlanda
Scandinavian Airlines Logo
6:40 am - 5:45 pmLHR  London Heathrow-ORD Chicago O'Hare Intl
16h 05m1 stop Kastrup Copenhagen
$673Scandinavian Airlines
Wed, Sep 23 - Wed, Sep 30
TAP AIR PORTUGAL Logo
6:00 pm - 3:35 pmORD  Chicago O'Hare Intl-LHR London Heathrow
15h 35m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
1:45 pm - 12:40 pmLHR  London Heathrow-ORD Chicago O'Hare Intl
28h 55m1 stop Lisbon Humberto Delgado
$698TAP AIR PORTUGAL
Thu, Oct 1 - Wed, Dec 9
TAP AIR PORTUGAL Logo
6:00 pm - 6:50 pmORD  Chicago O'Hare Intl-LHR London Heathrow
18h 50m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
6:00 am - 3:30 pmLHR  London Heathrow-ORD Chicago O'Hare Intl
15h 30m1 stop Lisbon Humberto Delgado
$702TAP AIR PORTUGAL
Booking Insights

KAYAK's insights & trends for Chicago to the United Kingdom flights

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

What is the cheapest Chicago to the United Kingdom flight route?

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

The cheapest ticket to the United Kingdom from Chicago found in the last 5 days was to London, at $840 round-trip. The most popular route is from Chicago O'Hare Intl Airport (ORD) to London Heathrow Airport (LHR), and the cheapest round-trip airline ticket found on this route in the last 5 days was $840.

What is the cheapest time of day to fly to the United Kingdom?

The average price for all round-trip flights from Chicago to the United Kingdom depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to the United Kingdom is generally in the evening, when round-trip flights cost $954 on average. Morning departures are around 100% cheaper than evening flights, on average. The most expensive time of day to fly to the United Kingdom is generally at night, which is peak travel time and where the average cost of a ticket is $971.

Can I save money by flying with a layover from Chicago to the United Kingdom?

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 $1,003, prices are generally cheapest when you fly direct.

What is the cheapest month to fly from Chicago to the United Kingdom?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Chicago to the United Kingdom, 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 to the United Kingdom is January, when tickets cost $654 (return) on average. On the other hand, the most expensive months are June and July, when the average cost of round-trip tickets is $1,345 and $1,100 respectively.

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

The average price of all round-trip flights from Chicago to the United Kingdom clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to United Kingdom on a Tuesday and more expensive on a Saturday. On your return trip to Chicago, you should consider flying back on a Thursday, and avoid Saturdays for better deals.

How far in advance should I book a flight from Chicago to the United Kingdom?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Chicago to the United Kingdom, 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 to the United Kingdom, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Good to know

Low season

January

Cheapest flight

$238
Best time to beat the crowds with an average 28% drop in price.
Most popular time to fly with an average 15% increase in price.
Flight from Chicago O'Hare Airport to Glasgow

Flights from Chicago to the United Kingdom: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Chicago to the United Kingdom 
Verified travelerFlew with British Airways-Mar 2026
Take early morning flights to adjust to weather-related delays.
Verified travelerFlew with British Airways-Jun 2025
Get a wheel chair if you have difficulty walking
JoeFlew with Iberia-Apr 2025
Get there early. Nice airport options while you wait.
Verified travelerFlew with Iberia-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-Jan 2025
Anticipate delays, prepare for long walks through Heathrow to baggage claim or for connections.
KariFlew with British Airways-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-Dec 2023
Find a flight where you are allowed to choose your seats before the day of boarding for anything international.

FAQs - booking United Kingdom flights

  • How does KAYAK find such low prices on flights from Chicago to the United Kingdom?

    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 the United Kingdom.

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

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

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

    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 from Chicago to the United Kingdom with an airline and back with another airline.

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

    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 from Chicago to the United Kingdom up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 5 airlines serving from Chicago to the United Kingdom

 
Need help choosing which airline to fly with from Chicago to the United Kingdom? 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 10098 reviews
7.7Boarding
6.7Food
7.1Entertainment
8.1Crew
7.3Comfort
Airline reviews

Old 757 with poor entertainment system. United no longer partners with United for free text and email. O'Hara an absolute disaster! Limited gates clauses two hour delay. Unfortunately this appears to be the norm.

2.0 MediocreRichard, Aug 2026
Read more United Airlines reviews

Old 757 with poor entertainment system. United no longer partners with United for free text and email. O'Hara an absolute disaster! Limited gates clauses two hour delay. Unfortunately this appears to be the norm.

It was a good experience, unfortunately my checked baggages were come late and not arrived on time.

Very stressful to locate United Airline boarding area, delayed flight, changing boarding area again to another location with all tiredness 😩. But flying was fine.

It was hot and not as comfortable as the flight to Chicago. Must have been a different plane that needs to be worked on or replaced.

The boarding of took of late.The presentation of the food was horrable as was the tast of the food was cold and tastless.

Fight was delayed an hour due to operational issues ,then further delayed due to ground control for a total of about 1.30 hours. Salad was completely frozen and flatware was so cold you could barely handle it. Crew was friendly and professional and the flight was smooth. The aircraft was clean and well-serviced.

Horrible! I paid for a straight flight from Chicago to London. A week before trip it changed and now I had a connecting flight. Our flight was delayed an hour and a half because our flight crew was still flying in from CA. Forty passengers ran from one plane to the next. The next United Airlines flight was delayed two to three hours because of mechanical difficulties. They had to ready another plane which took time. I missed my scheduled excursion in London. 😢

Flight delayed for 2 hours due to a part. The plane sat waiting for boarding for a long time and during final preflight inspection the issue was found. Why not do the preflight inspection sooner if you know the plane is being used?

All good, useful to have the united app from check in to boarding

The flight was clean and on time, the crew were all very nice and we got the seats we booked. Plenty of food and beverages. The seats are too close so it’s very difficult to try and sleep comfortably.

OK overall. Flight was delayed Crew on flight was good

Late late late. Delayed and arrived an hour late for a 1 hour 45 minute connection. Every time. Poor record for this company. I try to fly any other carrier first.

I flew economy class. Seats were very good and the crew was excellent

Fast and sensible boarding was absolutely amazing. But extortionate wifi and seats that barely moved, making me unable to sleep, didn't do a lot of favors.

I appteciate the very courteous staff. The flight was good. Something that wasn't good was that my bag was only checked as far as Dublin and I had a connecting flight to Vienna. (That was a mistake the ORD desk made.) Fortunately the desk at DUB was able to re-tag without me having to re-check in (which initially it seemed I might have to do.)

It was excellent! The plane left Chicago early. Arrived in Dublin early. The crew was excellent! It was a great experience.

Amenity kits were never handed out. There was zero friendliness and assistance by crew. Food was uneatable. One drink was offered and no wine, with dinner or before or after. Cocktails and beverages were not encouraged and when I asked for water, none was given. Poorest, most cramped business class flight I’ve ever been on.

Horrible. Garbage airline. Due to the strike we got a replacement plane/crew. I didn't get my exit row seat I paid for. Food was horrible. Plane was hot and didn't have AC vents.

I fly to the USA every 6wks on Ave and 99% of the time I fly Aer Lingus. If I fly BA I’m always disappointed. My only criticism is the food. I’m vegan and over the last year it’s got slightly better these last couple of flights but on the whole it’s not good! Salad and fruit salad for breakfast and that’s also the starter and desert for the lunch/dinner and the main is usually rice with fried veg 😳the pasta is pretty good though. That’s been the last 2 meals…. Everything else is fantastic.

Are Longus was fine. I booked thru Kayak and was unable to get my business class seat early. Sat next to galley. Crew forgot to wake me for breakfast.

Our flight was cancelled while we are on our way to the airport. So, no notice. We were rescheduled to another airline with a 2 hour later takeoff and so arrived at our destination on time. We pre-paid American Airlines $190 to upgrade our seats. No refund. So no use for AA or Kayak.

Terrible, horrible, disappointing- without telling us they changed planes and moved and separated our seats to opposite sides - said they changed seats putting us together - got to airport to find no, they did not - we sat opposing sides of plane - food overly salty to inedible, never saw stewardess but once - it was terrible

My wife and I love to travel, so we fly a lot. We've already logged 381,075 miles and with practically every major airline. But this flight was very disappointing. It started off well, with no delays and a new plane. But when lunchtime approached, all that good impression was ruined. Instead of white tablecloths, we were offered small, dark placemats, which, as it turned out, were perfectly adequate for the food. All the food offered—and my wife and I only took fish, and the meat—was not just bad, it was downright disgusting and not heated enough. The same applies to the appetizers. This was the first time in many years of traveling that we've been offered such disgusting food.

Lost luggage stuck no clothes and no word after 2 days leaving on cruise no stuff or clothes

This particular flight wasn't very full at the back, so there were three seats available for spreading out and getting relatively comfortable

Original flight delayed several times and finally canceled at 2:30 in the morning. Staff at the gate was not very helpful in resolving problems or communicating why there were delays. I spent 34 hours at the airport before I could leave, they couldn't book me on another early flight even after canceling my original flight. Next flight available after my original flight was canceled was 22 hours later. I will never fly American Airlines again.

It was good, the staff was friendly and it was a typical flight to Europe.

First leg of the flight was delayed by 2 1/2 hours with very little communication. We scrambled trying to talk to airline people at the airport about our connecting flight and received all different answers and no help. We ended up at our destination almost five hours when we were supposed to arrive. We ended up missing an afternoon that was already paid for due to the delays.

Flight left 2 hours late as it had to wait for luggage from American to be loaded. This cause me to miss my flight to Athens. The USB ports were broken so by the time I arrived in London my phone was out of battery.

Our 9:00 pm flight was cancelled on our way too the airport!!! No reason was given too us!!! So stressful!!! I couldn’t believe it!!! Thank goodness we arrived 6 hours ahead of time. We were able too get on an earlier flight. Than everything was great!!

Horrible. My dad was recently hospitalized and diagnosed with lymphoma and Icelandair refused to refund flight even though I had a letter from his physician.

The WiFi wasn’t working, so no one could watch any entertainment for 5 hours. The plane also was delayed and did not leave, nor did the staff prioritize those with connecting flights to de-board first. Everyone with a connecting flight to Munich missed their flight by 5 minutes. Then the next flight to Munich was 14 hours later. The airport could not compensate us because the closest hotel was about 2 hours away. This did not seem like the truth. I was not pleased with this traveling experience.

I DO NOT recommend Iceland air...missed connecting flight.....paid for isle seat upgrade for health reasons...had to do that over....baggage left in the rain so clothes got soaked other items ruined....called customer * dont care* service

The ticket was reserved in my name but not paid for by underpricer. Alaska airlines was unable to issue my ticket (could not connect the ticket with the PNR) due to an error with underpricer and I spent the better part of 2 hours at the ticket counter trying to rectify.

Screen didn't work, and neither did the button to tilt the seat even though the seat was comfortable

Worst airline I’ve ever flown. Delayed 5.5 hrs, missed connecting flight, and missed an entire day of vacation. Zero customer service

Everything sucked. No food, one small glass of water, a tiny coffee, 5.5 hour delay with no customer service. Would never recommend flying them.

Our three ski bags did not arrive and are still not delivered, one full day later. With one ski bag not traceable at all. I would not fly Iceland Air again.

Great crew, bumpy landings, two-hour wait for baggage with no communication or explanation. Will not fly again!

Decent service - nice seats. Crew were not overly attentive but can’t complain overall for the money

Comfortable seats, good service overall. The food could’ve been a little bit better. The boarding process was slightly chaotic and in fairness, not all of that is related to the performance of British Airways.

They gave away my business class seat. No explanation and no apology. Told me I had to take the downgrade if I wanted to get to India. Then no WiFi for 10 hours. Just ridiculous. We should not work with this company at Deloitte. They don’t know how to run a business.

Lady next to me was coughing profusely the entire flight, other lady moved seats because of it, 8 hours of that during an overnight flight is a bit much.

The seats are extra cramped if you are taller than 5’8! Spring for the extra legroom seats for sure if you have a long flight!

Very disappointed with British Airways. It has been over 24 hours and I still have not received my checked baggage or any proper update. Customer support has been unresponsive, making the situation even more frustrating. Poor baggage handling and lack of communication seriously impacted my travel experience.

Cancelled flight and re booked seats were a downgrade. British Airways said the upgrade was t available but when I checked it was but then they wouldn’t make it right

Overall ok. Best part has always been the sundae dessert.

Very good staff members with sincere passion and responsibility in their job.

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

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 the United Kingdom

Cabin class types available on flights to the United Kingdom

Cabin classes available on flights to the United Kingdom. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.