Cheap flights from London Heathrow Airport to Chicago from £251
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to Chicago departing on 8/9. 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 London Heathrow Airport to Chicago
Our best TAP AIR PORTUGAL deals on London Heathrow Airport to Chicago flight tickets
British Airways flights from London Heathrow Airport to Chicago
Our best British Airways deals on London Heathrow Airport to Chicago flight tickets
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How to get the cheapest flight ticket from London Heathrow Airport to Chicago
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 cheapest month to fly to Chicago?
The cheapest month to fly to Chicago from London Heathrow Airport is in February. Flight prices, which tend to average around £441, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of February, then book flights to Chicago from London Heathrow Airport during March instead. Flights to Chicago in March, while not as cheap as those in February, still average around £446.
What is the cheapest day to depart on your flight to Chicago?
The cheapest day to depart on your flight to Chicago is on a Wednesday when prices can be found for as low as £605. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Chicago is Sunday, with ticket prices averaging around £666.
What is the cheapest time of day to depart on your flight to Chicago?
Flying to Chicago from London Heathrow Airport in the evening is the least expensive time of day to depart. momondo users have found prices as low as £494 when looking at flights departing in the evening. Flights in the afternoon are often more expensive, with an average ticket price of £664.
What is the cheapest London Heathrow to Chicago flight route?
Fly from London Heathrow to Chicago O'Hare Intl for the best London Heathrow - Chicago flight prices
How far in advance should I book a flight to Chicago?
You are more likely to see cheaper flights to Chicago from London Heathrow Airport when booking 13 weeks ahead of your departure date. In general, you can expect to find flights to Chicago for around £546 when searching 13 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago from London Heathrow Airport for as low as £523 on momondo.
What cabin class options are available on London Heathrow to Chicago flights?
There are 4 cabin classes available to choose from on London Heathrow to Chicago 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 London Heathrow Airport to Chicago flights?
No. A direct flight is the cheapest option for a flight between London Heathrow Airport to Chicago.
How have London Heathrow Airport to Chicago flight prices changed over time?
As of June 2025, prices for London Heathrow Airport to Chicago flights are approximately 15% more expensive when compared to flights at the same time last year.
What is the cheapest airline that flies from London Heathrow to Chicago?
TAP AIR PORTUGAL, Aer Lingus, and Scandinavian Airlines are the most popular carriers operating from London Heathrow to Chicago
Which airlines fly to Chicago?
British Airways, Finnair and Lufthansa are the top three most popular airlines that fly to Chicago from London Heathrow Airport according to our data. British Airways is the first choice among our users, with 62% of people opting to fly with this airline when travelling to Chicago. Keep in mind that there are 16 different airlines that fly to Chicago on a routine basis, so you have a few additional options to choose from.
How many flights depart from London Heathrow Airport to Chicago on average per day?
The number of flights available between London Heathrow Airport and Chicago is 51 per day as of June 2025. The most frequent departure time is 14:00, with 53% of daily flights leaving in the afternoon.
How many flights depart from London Heathrow Airport to Chicago on average per week?
The number of flights available between London Heathrow Airport and Chicago is 358 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 London Heathrow Airport to Chicago
Cheap London Heathrow Airport to Chicago (LHR to CHI) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Chicago
How far is London Heathrow to Chicago by plane?
The distance between London Heathrow and Chicago is about 3933.5 mi. Typically, this will take 8h 25m by plane in normal conditions.
When did momondo last update prices for flights from London Heathrow Airport to Chicago?
Prices for flights from London Heathrow Airport to Chicago are updated daily.
How many operators does momondo search for flights from London Heathrow Airport to Chicago?
There are 16 operators available for flights from London Heathrow Airport to Chicago as of June 2025.
How old do you have to be to fly from London Heathrow Airport to Chicago?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Chicago.
What documentation or ID do you need to fly to Chicago?
The necessary travel and health documents for your Chicago trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from London Heathrow Airport to Chicago?
Based on momondo bookings for flights between London Heathrow Airport and Chicago, the leading plane model is Boeing 767-300, making up 40.03% of the total bookings. Other popular models include Boeing 787-10 Dreamliner with 20.47%, Boeing 777 with 15.62%, and Boeing 777-300ER with 7.67%.
What is the most popular airline from London Heathrow Airport to Chicago?
momondo data reveals that the most frequently booked airline on the route from London Heathrow Airport to Chicago is British Airways, representing 44% of all bookings. The subsequent popular airlines are Lufthansa at 11%, Finnair at 11%, and Aer Lingus at 7%.
Best airlines flying from London Heathrow Airport to Chicago
Compare and see reviews for airlines that fly from London Heathrow Airport to Chicago with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom £340 | Free Cancellation | Rating 7.0 499 reviews | |||
| PriceFrom £350 | Free Cancellation | Rating 7.3 1,387 reviews | |||
| PriceFrom £363 | Free Cancellation | Rating 7.1 1,887 reviews | |||
| PriceFrom £381 | Free Cancellation | Rating 7.4 652 reviews | |||
| PriceFrom £389 | Free Cancellation | Rating 7.4 355 reviews | |||
| PriceFrom £397 | Free Cancellation | Rating 7.6 802 reviews | |||
| PriceFrom £397 | Free Cancellation | Rating 6.7 7,139 reviews | |||
| PriceFrom £398 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom £400 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom £404 | Free Cancellation | Rating 6.6 7,011 reviews |
Austrian Airlines Flights From London Heathrow Airport to Chicago
Austrian Airlines is one of the most popular airlines flying from London Heathrow Airport to Chicago, operating 21 flights/week on average for this route. A good Austrian Airlines flight deal for London Heathrow Airport to Chicago starts from £539 round-trip, up to an average price of £761. Our users have rated Austrian Airlines at 7.6/10.
Finnair Flights From London Heathrow Airport to Chicago
£600 is the best Finnair flight deal from London Heathrow Airport to Chicago found on momondo over the last 72 hours. The average Finnair ticket price found was closer to £789, however, with flight time and availability significantly affecting the price. Finnair (7.6/10 from 1,290 user reviews) flies into Chicago from London Heathrow Airport 32 times in an average week so prices can vary.
Why use momondo?
Why should I use momondo to find a flight deal from London to Chicago?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from London to Chicago. momondo saves you time and could save you money on your trip.
Can I find flights from London to Chicago with flexible booking policies on momondo?
Flights from London to Chicago 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 London to Chicago?
momondo provides multiple filters to help you find the best flight to Chicago from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from London to Chicago right now. Can momondo alert me if prices change?
Yes. momondo can track prices for London to Chicago flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.