Cheap flights from Chicago to London from £147
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 20/7. 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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Icelandair flights from Chicago to London Heathrow Airport
Our best Icelandair deals on Chicago to London Heathrow Airport flight tickets
TAP AIR PORTUGAL flights from Chicago to London Heathrow Airport
Our best TAP AIR PORTUGAL deals on Chicago to London Heathrow Airport flight tickets
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How to get the cheapest flight ticket from Chicago 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, November is the cheapest month to fly from Chicago to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £496. The month of January is another great option to travel to London Heathrow Airport, with average flight prices from Chicago averaging around £501.
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 is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as £535. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Sunday is £667.
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 to London Heathrow Airport at midday for as low as £577. 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 evening when prices are £628 on average. Flights to London Heathrow Airport from Chicago in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.
What is the cheapest Chicago to London Heathrow flight route?
Fly from Chicago O'Hare Intl to London Heathrow for the best Chicago - 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 when booking 3 weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £588 when searching 3 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Chicago for as low as £533 on momondo.
What cabin class options are available on Chicago to London Heathrow flights?
There are 4 cabin classes available to choose from on Chicago to London Heathrow flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Chicago to London Heathrow?
Icelandair, TAP AIR PORTUGAL, and Aer Lingus are the most popular carriers operating from Chicago 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 according to our data. British Airways is the first choice among our users, with 48% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 6 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 to London Heathrow Airport on average per day?
As of May 2025, there are 54 flights per day flying from Chicago 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 to London Heathrow Airport on average per week?
The number of flights available between Chicago and London Heathrow Airport is 382 per week as of May 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 Heathrow Airport
Cheap Chicago to London Heathrow Airport (CHI to LHR) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Chicago to London Heathrow Airport
How far is Chicago to London Heathrow by plane?
A flight from Chicago to London Heathrow will travel around 3933.5 mi. 7h 35m is a normal flight duration for this route.
When did momondo last update prices for flights from Chicago to London Heathrow Airport?
Prices for flights from Chicago to London Heathrow Airport were last updated today.
How many operators does momondo search for flights from Chicago to London Heathrow Airport?
The number of operators available for flights from Chicago to London Heathrow Airport is 6 as of May 2025.
How old do you have to be to fly from Chicago 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 to London Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The travel and health documents required for your trip to London Heathrow Airport 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 Heathrow Airport. 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 Heathrow Airport?
Based on momondo bookings for flights between Chicago and London Heathrow Airport, the leading plane model is Boeing 787-9 Dreamliner, making up 42.24% of the total bookings. Other popular models include Boeing 787-10 Dreamliner with 19.60%, Boeing 777 with 17.55%, and Boeing 767-300 with 8.43%.
What is the most popular airline from Chicago to London Heathrow Airport?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Chicago to London Heathrow Airport is British Airways (54% of total bookings). The next most popular airlines are Iberia (37%) and Finnair (10%).
Best airlines flying from Chicago to London Heathrow Airport
Compare and see reviews for airlines that fly from Chicago to London Heathrow Airport with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom £357 | Free Cancellation | Rating 7.6 1,275 reviews | |||
| PriceFrom £384 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom £448 | Free Cancellation | Rating 7.0 2,701 reviews | |||
| PriceFrom £477 | Free Cancellation | Rating 6.6 6,845 reviews | |||
| PriceFrom £487 | Free Cancellation | Rating 6.7 7,045 reviews | |||
| PriceFrom £498 | Free Cancellation | Rating 7.4 8,696 reviews |
Finnair Flights From Chicago to London Heathrow Airport
Finnair is one of the most popular airlines flying from Chicago to London Heathrow Airport, operating 28 flights/week on average for this route. A good Finnair flight deal for Chicago to London Heathrow Airport starts from £478 round-trip, up to an average price of £904. Our users have rated Finnair at 7.6/10.
United Airlines Flights From Chicago to London Heathrow Airport
The best United Airlines deal for Chicago to London Heathrow Airport flight tickets found on momondo in the last 72 hours was £666, round-trip. It should be noted that an average United Airlines flight deal for this route in this time was higher, at £942 round-trip. United Airlines operates 21 flights out of Chicago into London Heathrow Airport in an average week, so prices vary by time and availability. 8,696 United Airlines reviews by users on momondo have scored the airline at 7.4/10.
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Why should I use momondo to find a flight deal from Chicago to London?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Chicago to London. momondo saves you time and could save you money on your trip.
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?
Once all potential Chicago to London flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from Chicago to London right now. Can momondo alert me if prices change?
Yes. momondo can track prices for Chicago to London 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.