Cheap flights from Chicago to London from £142
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago to London departing on 15/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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TAP AIR PORTUGAL flights from Chicago to London
Our best TAP AIR PORTUGAL deals on Chicago to London flight tickets
Icelandair flights from Chicago to London
Our best Icelandair deals on Chicago to London flight tickets
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How to get the cheapest flight ticket from Chicago to London
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the typical price of a round-trip flight between Chicago and London?
What is the cheapest month to fly to London?
The cheapest month to fly to London from Chicago is in February. Flight prices, which tend to average around £477, are often lower during this time because this is during the off-season. The month of January is another great option to travel to London, with average flight prices from Chicago averaging around £489.
What is the cheapest day to depart on your flight to London?
Our data shows that Wednesday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £538. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Chicago to London for around £657.
What is the cheapest time of day to depart on your flight to London?
The cheapest time of day to fly to London is in the afternoon when flights can be purchased for as low as £595. Flights at midday are often more expensive, with an average ticket price of £805.
What is the cheapest Chicago to London flight route?
Fly from Chicago O'Hare Intl to London Heathrow for the best Chicago - London flight prices
How far in advance should I book a flight to London?
You are more likely to see cheaper flights to London from Chicago when booking 16 weeks ahead of your departure date. In general, you can expect to find flights to London for around £591 when searching 16 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Chicago for as low as £524 on momondo.
What cabin class options are available on Chicago to London flights?
There are 4 cabin classes available to choose from on Chicago to London flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
Can stopping save me money on Chicago to London flights?
You could potentially save up to 30% on your flight if you consider stops on a Chicago to London flight.
How have Chicago to London flight prices changed over time?
As of June 2025, prices for Chicago to London flights are approximately 15% more expensive when compared to flights at the same time last year.
What is the cheapest airline that flies from Chicago to London?
TAP AIR PORTUGAL and Icelandair are the most popular carriers operating from Chicago to London
Which airlines fly to London?
British Airways, Iberia and Finnair are the top three most popular airlines that fly to London from Chicago according to our data. British Airways is the first choice among our users, with 52% of people opting to fly with this airline when travelling to London. Keep in mind that there are 7 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.
How many flights depart from Chicago to London on average per day?
As of June 2025, there are 55 flights per day flying from Chicago to London. The most common time of day flights depart is 21:00, with 65% of flights taking off in the evening.
How many flights depart from Chicago to London on average per week?
The number of flights available between Chicago and London is 390 per week as of June 2025. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.
When to book flights from Chicago to London
Cheap Chicago to London (CHI to LON) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Chicago to London
How far is Chicago to London by plane?
There are 3945.2 mi between Chicago and London. In terms of flight time, this usually takes a little over 9h 50m.
When did momondo last update prices for flights from Chicago to London?
Prices for flights from Chicago to London were last updated today.
How many operators does momondo search for flights from Chicago to London?
The number of operators available for flights from Chicago to London is 7 as of June 2025.
How old do you have to be to fly from Chicago to London?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Chicago to London.
What documentation or ID do you need to fly to London?
The travel and health documents required for your trip to London can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Chicago to London?
Based on momondo bookings for flights between Chicago and London, the leading plane model is Boeing 787-9 Dreamliner, making up 41.61% of the total bookings. Other popular models include Boeing 787-10 Dreamliner with 18.65%, Boeing 777 with 18.58%, and Boeing 767-300 with 12.31%.
What is the most popular airline from Chicago to London?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Chicago to London is British Airways (35% of total bookings). The next most popular airlines are Iberia (25%), Icelandair (12%), and Lufthansa (8%).
Best airlines flying from Chicago to London
Compare and see reviews for airlines that fly from Chicago to London with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom £352 | Free Cancellation | Rating 7.6 1,290 reviews | |||
| PriceFrom £378 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom £406 | Free Cancellation | Rating 7.1 1,118 reviews | |||
| PriceFrom £441 | Free Cancellation | Rating 7.0 2,776 reviews | |||
| PriceFrom £457 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom £469 | Free Cancellation | Rating 6.6 7,011 reviews | |||
| PriceFrom £479 | Free Cancellation | Rating 6.7 7,139 reviews |
Finnair Flights From Chicago to London
Finnair flight deals from Chicago to London start from £478 round-trip. Over the 33 Finnair flights for this route in a normal week, average airfare is usually £874 round-trip - but some users have found much cheaper deals with momondo.
United Airlines Flights From Chicago to London
United Airlines is also a popular choice for this route. United Airlines flight deals for Chicago to London start from as low as £621 round-trip, depending on your selected dates, with average United Airlines deals seen on momondo around £942. United Airlines operates 21 flights to London from Chicago in an average week. Users have rated it 7.4/10 across 8,790 reviews.
Travelling to a place near London?
Book flights to London if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Chicago to London?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Chicago to London for you.
Can I find flights from Chicago to London with flexible booking policies on momondo?
Flights from Chicago to London with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.
How can momondo help me find flights from Chicago to London?
momondo helps you find the best flight between Chicago and London by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.
I’m not ready to book a flight from Chicago to London right now. Can momondo alert me if prices change?
If you are not ready to book a flight from Chicago to London now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to London and let you know when they change.