Cheap flights from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport 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 O'Hare Intl Airport to London Heathrow Airport
Our best TAP AIR PORTUGAL deals on Chicago O'Hare Intl Airport to London Heathrow Airport flight tickets
Icelandair flights from Chicago O'Hare Intl Airport to London Heathrow Airport
Our best Icelandair deals on Chicago O'Hare Intl Airport to London Heathrow Airport flight tickets
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How to get the cheapest flight ticket from Chicago O'Hare Intl Airport to London Heathrow Airport
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 London Heathrow Airport?
In general, February is the cheapest month to fly from Chicago O'Hare Intl Airport to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £495. The month of April is another great option to travel to London Heathrow Airport, with average flight prices from Chicago O'Hare Intl Airport averaging around £499.
What is the cheapest day to depart on your flight to London Heathrow Airport?
On average, the least expensive day to fly to London Heathrow Airport from Chicago O'Hare Intl Airport is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as £538. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Saturday is £657.
What is the cheapest time of day to depart on your flight to London Heathrow Airport?
According to our data, the cheapest time of day to fly to London Heathrow Airport is at midday. momondo users have found flights departing from Chicago O'Hare Intl Airport to London Heathrow Airport at midday for as low as £568. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are £635 on average. Flights to London Heathrow Airport from Chicago O'Hare Intl Airport in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.
What is the cheapest Chicago O'Hare Intl to London Heathrow flight route?
Fly from Chicago O'Hare Intl to London Heathrow for the best Chicago O'Hare Intl - London Heathrow flight prices
How far in advance should I book a flight to London Heathrow Airport?
You are more likely to see cheaper flights to London Heathrow Airport from Chicago O'Hare Intl Airport when booking 16 weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport 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 Heathrow Airport from Chicago O'Hare Intl Airport for as low as £524 on momondo.
What cabin class options are available on Chicago O'Hare Intl to London Heathrow flights?
There are 4 cabin classes available to choose from on Chicago O'Hare Intl to London Heathrow 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 O'Hare Intl Airport to London Heathrow Airport flights?
You could potentially save up to 4% on your flight if you consider stops on a Chicago O'Hare Intl Airport to London Heathrow Airport flight.
How have Chicago O'Hare Intl Airport to London Heathrow Airport flight prices changed over time?
As of June 2025, prices for Chicago O'Hare Intl Airport to London Heathrow Airport flights are approximately 22% more expensive when compared to flights at the same time last year.
What is the cheapest airline that flies from Chicago O'Hare Intl to London Heathrow?
TAP AIR PORTUGAL, Icelandair, and JetBlue are the most popular carriers operating from Chicago O'Hare Intl to London Heathrow
Which airlines fly to London Heathrow Airport?
British Airways, Iberia and Finnair are the top three most popular airlines that fly to London Heathrow Airport from Chicago O'Hare Intl Airport 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 Heathrow Airport. Keep in mind that there are 7 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.
How many flights depart from Chicago O'Hare Intl Airport to London Heathrow Airport on average per day?
As of June 2025, there are 55 flights per day flying from Chicago O'Hare Intl Airport to London Heathrow Airport. 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 O'Hare Intl Airport to London Heathrow Airport on average per week?
The number of flights available between Chicago O'Hare Intl Airport and London Heathrow Airport 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 O'Hare Intl Airport to London Heathrow Airport
Cheap Chicago O'Hare Intl Airport to London Heathrow Airport (ORD to LHR) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Chicago O'Hare Intl Airport to London Heathrow Airport
How far is Chicago O'Hare Intl to London Heathrow by plane?
The distance between Chicago O'Hare Intl and London Heathrow is about 3939.2 mi. Typically, this will take 7h 55m by plane in normal conditions.
When did momondo last update prices for flights from Chicago O'Hare Intl Airport to London Heathrow Airport?
Prices for flights from Chicago O'Hare Intl Airport to London Heathrow Airport were last updated today.
How many operators does momondo search for flights from Chicago O'Hare Intl Airport to London Heathrow Airport?
As of June 2025, there are 7 operators available to choose from for flights from Chicago O'Hare Intl Airport to London Heathrow Airport.
How old do you have to be to fly from Chicago O'Hare Intl Airport to London Heathrow Airport?
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 O'Hare Intl Airport to London Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The travel and health documents you'll need for your trip to London Heathrow Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Heathrow Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Chicago O'Hare Intl Airport to London Heathrow Airport?
Based on momondo bookings for flights between Chicago O'Hare Intl Airport and London Heathrow Airport, 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 O'Hare Intl Airport to London Heathrow Airport?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Chicago O'Hare Intl Airport to London Heathrow Airport is British Airways (43% of total bookings). The next most popular airlines are Iberia (24%), Finnair (9%), and American Airlines (6%).
Best airlines flying from Chicago O'Hare Intl Airport to London Heathrow Airport
Compare and see reviews for airlines that fly from Chicago O'Hare Intl Airport to London Heathrow Airport 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 O'Hare Intl Airport to London Heathrow Airport
Finnair flies from Chicago O'Hare Intl Airport to London Heathrow Airport around 33 times per week, with 1,290 momondo users rating the airline 7.6/10. The cheapest Finnair deal from Chicago O'Hare Intl Airport to London Heathrow Airport in the last 72 hours was £478 (round-trip), much lower than the average airfare cost of £874 for Finnair flights on this route.
United Airlines Flights From Chicago O'Hare Intl Airport to London Heathrow Airport
Another popular option for Chicago O'Hare Intl Airport to London Heathrow Airport flights is United Airlines (7.4/10, 8,790 ratings). United Airlines flies from Chicago O'Hare Intl Airport to London Heathrow Airport around 21 times per week, with deals starting from £621 round-trip and rising to an average price of around £942.
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Why should I use momondo to find a flight deal from Chicago to London?
It is quick and easy to find Chicago to London flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to London that suits you.
Can I find flights from Chicago to London with flexible booking policies on momondo?
Yes. All flights to London from Chicago on momondo can be compared and filtered by various policies on offer, including flexible booking.
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?
Of course. momondo tracks the price of Chicago to London flights. All you need is a valid email address and we will do the rest; it is that quick and easy.