Question 1

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

Accepted Answer

As of February 2026, there are 253 flights per week flying from Chicago to London Heathrow Airport. The most common day of the week flights depart is Wed, with 15% of flights taking off on this day.

Question 2

Which layover airport has the shortest travel time from Chicago to London Heathrow Airport?

Accepted Answer

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 9h 58m.

Question 3

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

Accepted Answer

According to our data, American Airlines have had the least number of delays on this route over the last 12 months; with about 25% of their flights experiencing any sort of delay.

Question 4

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

Accepted Answer

The month of October is, on average, the cheapest month to fly to London Heathrow Airport from Chicago, with most prices found around $644. If you’re not able to fly to London Heathrow Airport in October, then January is your next best option. Flight prices from Chicago to London Heathrow Airport during January average around $648.

Question 5

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

Accepted Answer

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

Question 6

What airlines fly to London Heathrow Airport?

Accepted Answer

British Airways, Iberia and American Airlines 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 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 7

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

Accepted Answer

Dublin (DUB) was the most common stop: 44% of momondo users choosing 1-stop flights on this route connected there.

Question 8

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 $784 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 for as low as $688 on momondo.

Question 9

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

Accepted Answer

You could potentially save up to 1% on your flight if you consider stops on a Chicago to London Heathrow Airport flight.

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 167 minutes.

Question 11

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

Accepted Answer

As of February 2026, prices for Chicago to London Heathrow Airport flights are approximately 10% more expensive when compared to flights at the same time last year.

Question 12

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 $762. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $924.

Question 13

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

Accepted Answer

As of February 2026, there are 36 flights per day flying from Chicago to London Heathrow Airport. The most common time of day flights depart is 5:00PM, with 51% of flights taking off in the afternoon.

Question 14

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. Sunday has historically seen more delays on average compared to the rest of the week.

Question 15

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 16

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 to London Heathrow Airport in the evening for as low as $807. 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 $835.

Question 17

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 18

Which layover airport offers the lowest fares from Chicago to London Heathrow Airport?

Accepted Answer

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

Question 19

What is the typical price of a round-trip flight between Chicago and London Heathrow Airport?

Accepted Answer

Prices are currently low for flights on this route.Typical prices usually range from $600 to $735.
The lowest price recently found on this route was $520.

Question 20

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 21

Which layover airport has the shortest connection time from Chicago to London Heathrow Airport?

Accepted Answer

Dublin (DUB) has the shortest average layover time for this route: 1h 20m.

Question 22

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 refresh daily.

Question 23

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 16 as of February 2026.

Question 24

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

Accepted Answer

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 Chicago to London Heathrow Airport.

Question 25

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	$389
Fastest flight time	7h 40m
Direct flights	Every day

Airline	Rating	Free Cancellation	Price
JetBlue	PriceFrom $51	Free Cancellation	Rating 7.2 2,893 reviews	Search JetBlue flights
SWISS	PriceFrom $257	Free Cancellation	Rating 7.6 1,864 reviews	Search SWISS flights
Scandinavian Airlines	PriceFrom $331	Free Cancellation	Rating 7.3 1,677 reviews	Search Scandinavian Airlines flights
Delta	PriceFrom $345	Free Cancellation	Rating 7.9 8,139 reviews	Search Delta flights
TAP AIR PORTUGAL	PriceFrom $427	Free Cancellation	Rating 7.1 2,133 reviews	Search TAP AIR PORTUGAL flights
Lufthansa	PriceFrom $480	Free Cancellation	Rating 6.8 7,759 reviews	Search Lufthansa flights
Icelandair	PriceFrom $481	Free Cancellation	Rating 7.1 606 reviews	Search Icelandair flights
Aer Lingus	PriceFrom $493	Free Cancellation	Rating 7.2 1,444 reviews	Search Aer Lingus flights
Finnair	PriceFrom $516	Free Cancellation	Rating 7.6 1,357 reviews	Search Finnair flights
Alaska Airlines	PriceFrom $522	Free Cancellation	Rating 8.0 11,834 reviews	Search Alaska Airlines flights

Cheap flights from Chicago to London from $353

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