Question 1

Which airport is the most popular layover for flights between Chicago O'Hare Intl Airport and London Heathrow Airport?

Accepted Answer

Dublin (DUB) was the most common stop: 48% of momondo users choosing 1-stop flights on this route connected there.

Question 2

Which layover airport has the shortest connection time from Chicago O'Hare Intl Airport to London Heathrow Airport?

Accepted Answer

Dublin (DUB) has the shortest average layover time for this route: 1h 19m.

Question 3

Can stopping save me money on Chicago O'Hare Intl Airport to London Heathrow Airport flights?

Accepted Answer

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.

Question 4

How have Chicago O'Hare Intl Airport to London Heathrow Airport flight prices changed over time?

Accepted Answer

As of December 2025, prices for Chicago O'Hare Intl Airport to London Heathrow Airport flights are approximately 105% more expensive when compared to flights at the same time last year.

Question 5

Which layover airport has the shortest travel time from Chicago O'Hare Intl Airport to London Heathrow Airport?

Accepted Answer

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 9h 57m.

Question 6

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

Accepted Answer

The month of April is, on average, the cheapest month to fly to London Heathrow Airport from Chicago O'Hare Intl Airport, with most prices found around $672. If you’re not able to fly to London Heathrow Airport in April, then February is your next best option. Flight prices from Chicago O'Hare Intl Airport to London Heathrow Airport during February average around $678.

Question 7

What is the cheapest airline that flies from Chicago O'Hare Intl to London Heathrow?

Accepted Answer

British Airways, Lufthansa, and JetBlue are the most popular carriers operating from Chicago O'Hare Intl to London Heathrow

Question 8

Which layover airport offers the lowest fares from Chicago O'Hare Intl Airport to London Heathrow Airport?

Accepted Answer

Flights via Zurich (ZRH) offer the lowest average round-trip price of $508.

Question 9

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

Accepted Answer

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $770. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $918.

Question 10

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

Accepted Answer

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

Question 11

What cabin class options are available on Chicago O'Hare Intl to London Heathrow flights?

Accepted Answer

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.

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 at night have, in the past, seen delays more frequently in comparison.

Question 13

What is the cheapest Chicago O'Hare Intl to London Heathrow flight route?

Accepted Answer

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

Question 14

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 evening. momondo users have found flights departing from Chicago O'Hare Intl Airport to London Heathrow Airport in the evening for as low as $806. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the afternoon are often more expensive with an average ticket price of $830.

Question 15

How many flights depart from Chicago O'Hare Intl Airport to London Heathrow Airport on average per day?

Accepted Answer

As of December 2025, 45 flights take off from Chicago O'Hare Intl Airport and land in London Heathrow Airport each day. The most common flight departure time for this route is 5:00PM, with 56% of daily flights taking off in the evening.

Question 16

How many flights depart from Chicago O'Hare Intl Airport to London Heathrow Airport on average per week?

Accepted Answer

As of December 2025, 315 flights take off from Chicago O'Hare Intl Airport and land in London Heathrow Airport each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.

Question 17

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 18

What airlines fly to London Heathrow Airport?

Accepted Answer

British Airways, Iberia and United Airlines 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 50% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 16 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

Question 19

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

Accepted Answer

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

Question 20

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 O'Hare Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $795 when searching 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 $702 on momondo.

Question 21

When did momondo last update prices for flights from Chicago O'Hare Intl Airport to London Heathrow Airport?

Accepted Answer

Prices for flights from Chicago O'Hare Intl Airport to London Heathrow Airport refresh daily.

Question 22

How many operators does momondo search for flights from Chicago O'Hare Intl Airport to London Heathrow Airport?

Accepted Answer

The number of operators available for flights from Chicago O'Hare Intl Airport to London Heathrow Airport is 16 as of December 2025.

Question 23

How old do you have to be to fly from Chicago O'Hare Intl Airport 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 O'Hare Intl Airport to London Heathrow Airport.

Question 24

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

Accepted Answer

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.

Best Price Found	$399
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JetBlue	PriceFrom $51	Free Cancellation	Rating 7.2 2,898 reviews	Search JetBlue flights
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Delta	PriceFrom $345	Free Cancellation	Rating 7.9 8,015 reviews	Search Delta flights
TAP AIR PORTUGAL	PriceFrom $428	Free Cancellation	Rating 7.2 2,095 reviews	Search TAP AIR PORTUGAL flights
Lufthansa	PriceFrom $460	Free Cancellation	Rating 6.8 7,649 reviews	Search Lufthansa flights
Icelandair	PriceFrom $481	Free Cancellation	Rating 7.0 592 reviews	Search Icelandair flights
Aer Lingus	PriceFrom $494	Free Cancellation	Rating 7.2 1,412 reviews	Search Aer Lingus flights
Finnair	PriceFrom $517	Free Cancellation	Rating 7.6 1,339 reviews	Search Finnair flights
Alaska Airlines	PriceFrom $522	Free Cancellation	Rating 8.0 11,515 reviews	Search Alaska Airlines flights

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How to get the cheapest flight ticket from Chicago O'Hare Intl Airport 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?

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $770. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $918.

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

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?

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 December 2025, prices for Chicago O'Hare Intl Airport to London Heathrow Airport flights are approximately 105% 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?

British Airways, Lufthansa, and JetBlue are the most popular carriers operating from Chicago O'Hare Intl to London Heathrow

What 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 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 which experiences the fewest number of 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 least number of delays on this route over the last 12 months; with about 23% of their flights experiencing any sort of delay.

Which airport is the most popular layover for flights between Chicago O'Hare Intl Airport and London Heathrow Airport?

Dublin (DUB) was the most common stop: 48% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Chicago O'Hare Intl Airport to London Heathrow Airport?

Flights via Zurich (ZRH) offer the lowest average round-trip price of $508.

Which layover airport has the shortest travel time from Chicago O'Hare Intl Airport to London Heathrow Airport?

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 9h 57m.

Which layover airport has the shortest connection time from Chicago O'Hare Intl Airport to London Heathrow Airport?

Dublin (DUB) has the shortest average layover time for this route: 1h 19m.

How many flights depart from Chicago O'Hare Intl Airport to London Heathrow Airport on average per day?

As of December 2025, 45 flights take off from Chicago O'Hare Intl Airport and land in London Heathrow Airport each day. The most common flight departure time for this route is 5:00PM, with 56% of daily flights taking off in the evening.

How many flights depart from Chicago O'Hare Intl Airport to London Heathrow Airport on average per week?

As of December 2025, 315 flights take off from Chicago O'Hare Intl Airport and land in London Heathrow Airport each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.

When to book flights from Chicago O'Hare Intl Airport to London Heathrow Airport

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How old do you have to be to fly from Chicago O'Hare Intl Airport to London Heathrow Airport?

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

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