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

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

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

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

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

Dublin (DUB) has the shortest average layover time for this route: 1h 15m.

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.

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

As of December 2025, there are 320 flights per week flying from Chicago to London Heathrow Airport. The most common day of the week flights depart is Wed, with 16% of flights taking off on this day.

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.

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

Dublin (DUB) was the most common stop: 47% of momondo users choosing 1-stop flights on this route connected there.

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

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

What airlines fly to London Heathrow Airport?

British Airways, Iberia and United 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 51% 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.

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.

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 5:00PM, with 56% of flights taking off in the evening.

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

Prices for flights from Chicago to London Heathrow Airport refresh daily.

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 16 as of December 2025.

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

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.

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.

$378 Cheap Flights from Chicago to London Heathrow Airport in 2025/26

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7:30 pm - 10:50 am

ORD

LHR

10h 20m1 stop

12:15 pm - 6:20 pm

LHR

ORD

11h 05m1 stop

$545Icelandair

Wed, Mar 18 - Tue, Mar 24

7:20 pm - 5:40 pm

ORD

LHR

16h 20m1 stop

10:20 am - 4:45 pm

LHR

ORD

12h 25m1 stop

$546Scandinavian Airlines

Sat, Jan 17 - Sat, Jan 24

7:20 pm - 4:25 pm

ORD

LHR

15h 05m2 stops

6:40 am - 4:45 pm

LHR

ORD

16h 05m1 stop

$547Scandinavian Airlines

Sat, Jan 17 - Wed, Jan 21

7:20 pm - 4:25 pm

ORD

LHR

15h 05m2 stops

6:40 am - 4:55 pm

LHR

ORD

16h 15m2 stops

$548Scandinavian Airlines

Wed, Jan 28 - Sun, Feb 8

7:25 pm - 8:20 pm

ORD

LHR

18h 55m1 stop

1:05 pm - 6:15 pm

LHR

ORD

11h 10m1 stop

$550Icelandair

Thu, Apr 30 - Thu, May 7

8:15 pm - 5:30 pm

ORD

LHR

15h 15m1 stop

6:00 am - 3:25 pm

LHR

ORD

15h 25m1 stop

$554TAP AIR PORTUGAL

Fri, Jan 16 - Fri, Jan 23

4:30 pm - 11:40 am

MDW

LHR

13h 10m1 stop

8:40 am - 5:37 pm

LHR

MDW

14h 57m2 stops

$636Delta

Sun, Feb 8 - Thu, Feb 19

1:49 pm - 7:05 am

MDW

LHR

11h 16m1 stop

6:30 am - 5:55 pm

LHR

MDW

17h 25m2 stops

$637Delta

Wed, Jan 14 - Tue, Jan 20

11:21 am - 8:45 am

MDW

LHR

15h 24m2 stops

6:30 am - 5:29 pm

LHR

MDW

16h 59m2 stops

$641Virgin Atlantic

Wed, Jan 14 - Tue, Jan 20

9:32 am - 6:30 am

MDW

LHR

14h 58m2 stops

6:30 am - 4:25 pm

LHR

MDW

15h 55m2 stops

$656Virgin Atlantic

Wed, Apr 1 - Thu, Apr 16

Icelandair flights from Chicago to London Heathrow Airport

Our best Icelandair deals on Chicago to London Heathrow Airport flight tickets

Icelandair

Mar 18

ORD7:30 pmChicago O'Hare Intl

10h 20m

1 stop

LHR10:50 amLondon Heathrow

Mar 24

LHR12:15 pmLondon Heathrow

11h 05m

1 stop

ORD6:20 pmChicago O'Hare Intl

$545

Find similar

Icelandair

Apr 30

ORD7:25 pmChicago O'Hare Intl

18h 55m

1 stop

LHR8:20 pmLondon Heathrow

May 7

LHR1:05 pmLondon Heathrow

11h 10m

1 stop

ORD6:15 pmChicago O'Hare Intl

$550

Find similar

Icelandair

Jan 6

ORD6:30 pmChicago O'Hare Intl

19h 00m

1 stop

LHR7:30 pmLondon Heathrow

Jan 15

LHR12:15 pmLondon Heathrow

11h 05m

1 stop

ORD5:20 pmChicago O'Hare Intl

$551

Find similar

Delta flights from Chicago to London Heathrow Airport

Our best Delta deals on Chicago to London Heathrow Airport flight tickets

Delta

Feb 8

MDW4:30 pmChicago Midway

13h 10m

1 stop

LHR11:40 amLondon Heathrow

Feb 19

LHR8:40 amLondon Heathrow

14h 57m

2 stops

MDW5:37 pmChicago Midway

$636

Find similar

Delta

Jan 14

MDW1:49 pmChicago Midway

11h 16m

1 stop

LHR7:05 amLondon Heathrow

Jan 20

LHR6:30 amLondon Heathrow

17h 25m

2 stops

MDW5:55 pmChicago Midway

$637

Find similar

Delta

Apr 8

MDW7:20 pmChicago Midway

11h 50m

1 stop

LHR1:10 pmLondon Heathrow

Apr 15

LHR8:40 amLondon Heathrow

15h 25m

2 stops

MDW6:05 pmChicago Midway

$652

Find similar

momondo Fare Finder

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

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Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 3/18

7:30 pm-10:50 am

1 stop10h 20m

London Heathrow

Tue 3/24

12:15 pm-6:20 pm

1 stop11h 05m

$545

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 1/17

7:20 pm-5:40 pm

1 stop16h 20m

London Heathrow

Sat 1/24

10:20 am-4:45 pm

1 stop12h 25m

$546

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 1/17

7:20 pm-4:25 pm

2 stops15h 05m

London Heathrow

Wed 1/21

6:40 am-4:45 pm

1 stop16h 05m

$547

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 1/28

7:20 pm-4:25 pm

2 stops15h 05m

London Heathrow

Sun 2/8

6:40 am-4:55 pm

2 stops16h 15m

$548

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 4/30

7:25 pm-8:20 pm

1 stop18h 55m

London Heathrow

Thu 5/7

1:05 pm-6:15 pm

1 stop11h 10m

$550

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 1/16

8:15 pm-5:30 pm

1 stop15h 15m

London Heathrow

Fri 1/23

6:00 am-3:25 pm

1 stop15h 25m

$554

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Sun 2/8

4:30 pm-11:40 am

1 stop13h 10m

London Heathrow

Thu 2/19

8:40 am-5:37 pm

2 stops14h 57m

$636

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Wed 1/14

1:49 pm-7:05 am

1 stop11h 16m

London Heathrow

Tue 1/20

6:30 am-5:55 pm

2 stops17h 25m

$637

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Wed 1/14

11:21 am-8:45 am

2 stops15h 24m

London Heathrow

Tue 1/20

6:30 am-5:29 pm

2 stops16h 59m

$641

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Wed 4/1

9:32 am-6:30 am

2 stops14h 58m

London Heathrow

Thu 4/16

6:30 am-4:25 pm

2 stops15h 55m

$656

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Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Delays

Layovers

Other information

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

The month of October is, on average, the cheapest month to fly to London Heathrow Airport from Chicago, with most prices found around $646. 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 $654.

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 $771. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $921.

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 in the evening. momondo users have found flights departing from Chicago 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 $832.

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 weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $796 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 $702 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.

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.

When to book flights from Chicago to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Chicago to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

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	$402
Fastest flight time	7h 40m
Direct flights	Every day

The best one-way flight to London Heathrow Airport from Chicago in the past 72 hours is $402. The best round-trip flight deal from Chicago to London Heathrow Airport found on momondo in the last 72 hours is $671.

The fastest flight from Chicago to London Heathrow Airport takes 7h 40m

Direct flights go from Chicago to London Heathrow Airport every day.

Search flight deals

How far is Chicago to London Heathrow by plane?
There are 3933.5 mi between Chicago and London Heathrow. A reasonable flight in good conditions will take 7h 40m.
When did momondo last update prices for flights from Chicago to London Heathrow Airport?
Prices for flights from Chicago to London Heathrow Airport refresh daily.
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 16 as of December 2025.
How old do you have to be to fly from Chicago to London Heathrow Airport?
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.
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 to London Heathrow Airport?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Chicago to London Heathrow Airport is Boeing 787-9 Dreamliner (38.78% of total bookings). The next most popular plane models are Boeing 767-300 (20.39%), Boeing 787-10 Dreamliner (16.40%), and Boeing 777 (12.72%).
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 (32% of total bookings). The next most popular airlines are Iberia (18%), United Airlines (16%), and American Airlines (13%).

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
JetBlue	PriceFrom $51	Free Cancellation	Rating 7.2 2,897 reviews	Search JetBlue flights
SWISS	PriceFrom $257	Free Cancellation	Rating 7.5 1,815 reviews	Search SWISS flights
Scandinavian Airlines	PriceFrom $338	Free Cancellation	Rating 7.4 1,607 reviews	Search Scandinavian Airlines flights
Delta	PriceFrom $345	Free Cancellation	Rating 7.9 8,005 reviews	Search Delta flights
TAP AIR PORTUGAL	PriceFrom $428	Free Cancellation	Rating 7.2 2,091 reviews	Search TAP AIR PORTUGAL flights
Lufthansa	PriceFrom $460	Free Cancellation	Rating 6.8 7,635 reviews	Search Lufthansa flights
Icelandair	PriceFrom $481	Free Cancellation	Rating 7.0 591 reviews	Search Icelandair flights
Aer Lingus	PriceFrom $504	Free Cancellation	Rating 7.2 1,395 reviews	Search Aer Lingus flights
Finnair	PriceFrom $518	Free Cancellation	Rating 7.6 1,338 reviews	Search Finnair flights
Alaska Airlines	PriceFrom $522	Free Cancellation	Rating 8.0 11,477 reviews	Search Alaska Airlines flights

Alaska Airlines Flights From Chicago to London Heathrow Airport
Alaska Airlines operates around 20 flights from Chicago to London Heathrow Airport every week. The average price of these flights found in the last 72 hours has been $919, but momondo users have found Alaska Airlines deals from Chicago to London Heathrow Airport from as low as $522 round-trip. Alaska Airlines has been scored 8.0/10 in 11,477 reviews.
Finnair Flights From Chicago to London Heathrow Airport
Finnair (7.6/10 from 1,338 reviews) operates around 20 flights from Chicago to London Heathrow Airport in any given week. The average Finnair airfare for this route is around $771, with deals from around $518 rare but found on momondo. Referenced prices are for round-trip Chicago to London Heathrow Airport flight searches in the last 72 hours.

Gatwick

Hounslow

Milton Keynes

Dover

Luton

Slough

Guildford

Hayes

Dartford

Stratford-upon-Avon

Crawley

Brentwood

Salisbury

Wembley

Watford

Ilford

Cobham

Folkestone

Romford

Richmond

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Chicago.

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?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight 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?

If you are not ready to book a flight from Chicago to London now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to London and let you know when they change.

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Cheap flights from Chicago to London from $378

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 2/9. 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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Our best Icelandair deals on Chicago to London Heathrow Airport flight tickets

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Our best Delta deals on Chicago to London Heathrow Airport flight tickets

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

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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?

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 $771. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $921.

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.

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 Virgin Atlantic are the most popular carriers operating from Chicago 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 and London Heathrow Airport?

Dublin (DUB) was the most common stop: 47% of momondo users choosing 1-stop flights on this route connected there.

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

Dublin (DUB) has the shortest average layover time for this route: 1h 15m.

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 5:00PM, with 56% of flights taking off in the evening.

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

As of December 2025, there are 320 flights per week flying from Chicago to London Heathrow Airport. The most common day of the week flights depart is Wed, with 16% of flights taking off 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

Alaska Airlines Flights From Chicago to London Heathrow Airport

Finnair Flights From Chicago to London Heathrow Airport

Traveling 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?