Question 1

What is the cheapest airline that flies from Chicago to London Heathrow?

Accepted Answer

British Airways, Scandinavian Airlines, and Delta are the most popular carriers operating from Chicago to London Heathrow

Question 2

How far in advance should I book a flight to London Heathrow Airport?

Accepted Answer

You are more likely to see cheaper flights to London Heathrow Airport from Chicago when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £595 when searching weeks before you fly. 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 £525 on momondo.

Question 3

How many flights depart from Chicago to London Heathrow Airport on average per day?

Accepted Answer

As of December 2025, there are 45 flights per day flying from Chicago to London Heathrow Airport. The most common time of day flights depart is 17:00, with 56% of flights taking off in the evening.

Question 4

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

Accepted Answer

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from Chicago to London Heathrow Airport in the afternoon for as low as £557. 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 at midday when prices are £577 on average. Flights to London Heathrow Airport from Chicago at midday are generally more expensive because this time of day is more convenient for travellers’ schedules.

Question 5

Can stopping save me money on Chicago to London Heathrow Airport flights?

Accepted Answer

You could potentially save up to 5% on your flight if you consider stops on a Chicago to London Heathrow Airport flight.

Question 6

What is the cheapest Chicago to London Heathrow flight route?

Accepted Answer

Fly from Chicago O'Hare Intl to London Heathrow for the best Chicago - London Heathrow flight prices

Question 7

Which airlines fly to London Heathrow Airport?

Accepted Answer

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 51% 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.

Question 8

How many flights depart from Chicago to London Heathrow Airport on average per week?

Accepted Answer

The number of flights available between Chicago and London Heathrow Airport is 320 per week as of December 2025. The most frequent departure day is Wed, with 16% of weekly flights leaving on this day.

Question 9

What day of the week experiences the fewest flight delays on this route?

Accepted Answer

Tuesday is statistically the day of the week that experiences the fewest delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

Question 10

How often are flights from Chicago to London delayed?

Accepted Answer

Historically, on average around 25% of flights between Chicago and London have experienced a delay on any given week. The average delay length over the past 12 months has been 168 minutes.

Question 11

What is the cheapest month to fly to London Heathrow Airport?

Accepted Answer

In general, October 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 £483. The month of January is another great option to travel to London Heathrow Airport, with average flight prices from Chicago averaging around £489.

Question 12

What is the most punctual flight time for Chicago to London flights?

Accepted Answer

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights departing at night have, in the past, seen delays more frequently in comparison.

Question 13

What is the cheapest day to depart on your flight to London Heathrow Airport?

Accepted Answer

On average, the least expensive day to fly to London Heathrow Airport from Chicago is on a Sunday. momondo users have found tickets for Sunday departures for as low as £508. 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 £685.

Question 14

What cabin class options are available on Chicago to London Heathrow flights?

Accepted Answer

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.

Question 15

How have Chicago to London Heathrow Airport flight prices changed over time?

Accepted Answer

As of December 2025, prices for Chicago to London Heathrow Airport flights are approximately 3% cheaper when compared to flights at the same time last year.

Question 16

Which airline has the best punctuality record on Chicago to London flights?

Accepted Answer

According to our data, United Airlines have had the fewest delays on this route over the last 12 months, with about 23% of their flights experiencing any sort of delay.

Question 17

When did momondo last update prices for flights from Chicago to London Heathrow Airport?

Accepted Answer

Prices for flights from Chicago to London Heathrow Airport were last updated today.

Question 18

How many operators does momondo search for flights from Chicago to London Heathrow Airport?

Accepted Answer

The number of operators available for flights from Chicago to London Heathrow Airport is 7 as of December 2025.

Question 19

How old do you have to be to fly from Chicago to London Heathrow Airport?

Accepted Answer

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.

Question 20

What documentation or ID do you need to fly to London Heathrow Airport?

Accepted Answer

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.

Best price found	£298
Fastest flight time	7h 40m
Direct flights	Every day

Airline	Rating	Free Cancellation	Price
Lufthansa	PriceFrom £360	Free Cancellation	Rating 6.8 7,635 reviews	Search Lufthansa flights
American Airlines	PriceFrom £387	Free Cancellation	Rating 7.2 11,054 reviews	Search American Airlines flights
Finnair	PriceFrom £416	Free Cancellation	Rating 7.6 1,338 reviews	Search Finnair flights
British Airways	PriceFrom £425	Free Cancellation	Rating 6.7 7,585 reviews	Search British Airways flights
Iberia	PriceFrom £448	Free Cancellation	Rating 7.0 3,053 reviews	Search Iberia flights
Aer Lingus	PriceFrom £451	Free Cancellation	Rating 7.2 1,399 reviews	Search Aer Lingus flights
United Airlines	PriceFrom £464	Free Cancellation	Rating 7.4 9,093 reviews	Search United Airlines flights

Cheap flights from Chicago to London from £283

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 9/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names, great deals

Big names, great deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Chicago to London

Cheap return flights

Cheap one-way flights

Cheap last-minute flights

Cheap direct flights

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

momondo Fare Finder

Use the filters below to find and compare flights from Chicago to London Heathrow Airport that are best for you.

See travel insights to London from

How to get the cheapest flight ticket from Chicago to London Heathrow Airport

What is the cheapest month to fly to London Heathrow Airport?

What is the cheapest day to depart on your flight to London Heathrow Airport?

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

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?

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.

Can stopping save me money on Chicago to London Heathrow Airport flights?

You could potentially save up to 5% on your flight if you consider stops on a Chicago to London Heathrow Airport flight.

How have Chicago to London Heathrow Airport flight prices changed over time?

As of December 2025, prices for Chicago to London Heathrow Airport flights are approximately 3% cheaper when compared to flights at the same time last year.

What is the cheapest airline that flies from Chicago to London Heathrow?

British Airways, Scandinavian Airlines, and Delta are the most popular carriers operating from Chicago to London Heathrow

Which airlines fly to London Heathrow Airport?

How often are flights from Chicago to London delayed?

Historically, on average around 25% of flights between Chicago and London have experienced a delay on any given week. The average delay length over the past 12 months has been 168 minutes.

What is the most punctual flight time for Chicago to London flights?

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights departing at night have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Tuesday is statistically the day of the week that experiences the fewest delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Chicago to London flights?

According to our data, United Airlines have had the fewest delays on this route over the last 12 months, with about 23% of their flights experiencing any sort of delay.

How many flights depart from Chicago to London Heathrow Airport on average per day?

As of December 2025, there are 45 flights per day flying from Chicago to London Heathrow Airport. The most common time of day flights depart is 17:00, with 56% 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 320 per week as of December 2025. The most frequent departure day is Wed, with 16% 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

Best price found

Fastest flight time

Direct flights

How far is Chicago to London Heathrow by plane?

When did momondo last update prices for flights from Chicago to London Heathrow Airport?

How many operators does momondo search for flights from Chicago to London Heathrow Airport?

How old do you have to be to fly from Chicago to London Heathrow Airport?

What documentation or ID do you need to fly to London Heathrow Airport?

What is the most popular plane model from Chicago to London Heathrow Airport?

What is the most popular airline from Chicago to London Heathrow Airport?

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

Finnair Flights From Chicago to London Heathrow Airport

United Airlines Flights From Chicago to London Heathrow Airport

Travelling to a place near London?

Why use momondo?

Why should I use momondo to find a flight deal from Chicago to London?

Can I find flights from Chicago to London with flexible booking policies on momondo?

How can momondo help me find flights from Chicago to London?

I’m not ready to book a flight from Chicago to London right now. Can momondo alert me if prices change?

An easier way to manage your London Heathrow Airport trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to London

Popular Cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo