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

TAP AIR PORTUGAL, WestJet, and JetBlue are the most popular carriers operating from Illinois to London Heathrow

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

As of August 2025, there are 54 flights per day flying from Illinois to London Heathrow Airport. The most common time of day flights depart is 9:00PM, with 65% of flights taking off in the evening.

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

379 flights are operational weekly from Illinois to London Heathrow Airport as of August 2025. The most popular departure day for this route is Mon, with 15% of flights per week taking off on this day.

How long does it take to fly to London Heathrow Airport?

On average, it takes 9h 29m to fly from Illinois to London Heathrow Airport if you fly out of Chicago (the most popular airport in Illinois) and into London Heathrow Airport (the most popular airport in London Heathrow Airport). If you’re flying out of Moline and into London Heathrow Airport, then the flight time is around 12h 11m.

What airlines fly to London Heathrow Airport?

British Airways, Iberia and American Airlines are the top three most popular airlines that fly to London Heathrow Airport from Illinois according to our data. British Airways is the first choice among our users, with 49% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 15 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

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

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

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

As of August 2025, there are 17 operators available to choose from for flights from Illinois to London Heathrow Airport.

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

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois 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.

$229 Cheap Flights from Illinois to London Heathrow Airport in 2025

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Find the cheapest flights from Illinois to London

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

7:25 pm - 11:55 amORD-LHR

10h 30m1 stop

12:15 pm - 5:20 pmLHR-ORD

11h 05m1 stop

$503Icelandair

Find Deal

Sat, Sep 20 - Sun, Nov 9

7:20 pm - 4:25 pmORD-LHR

15h 05m2 stops

7:05 am - 4:45 pmLHR-ORD

15h 40m2 stops

$504Scandinavian Airlines

Find Deal

Fri, Nov 7 - Thu, Nov 13

9:41 am - 7:05 amMDW-LHR

15h 24m1 stop

11:05 am - 6:07 pmLHR-MDW

13h 02m1 stop

$506Virgin Atlantic

Find Deal

Tue, Nov 25 - Thu, Dec 4

5:10 pm - 6:55 amORD-LHR

7h 45mnonstop

7:05 pm - 2:30 pmLHR-ORD

25h 25m1 stop

$513Iberia

Find Deal

Mon, Dec 1 - Tue, Dec 9

1:25 pm - 6:25 amORD-LHR

11h 00m1 stop

6:15 am - 3:00 pmLHR-ORD

14h 45m1 stop

$516Delta

Find Deal

Mon, Sep 8 - Tue, Sep 16

3:09 pm - 7:50 amORD-LHR

10h 41m1 stop

6:45 pm - 2:15 pmLHR-ORD

25h 30m1 stop

$517Iberia

Find Deal

Mon, Sep 8 - Wed, Sep 17

5:10 pm - 6:55 amORD-LHR

7h 45mnonstop

3:45 pm - 6:45 pmLHR-ORD

9h 00mnonstop

$518Finnair

Find Deal

Wed, Feb 11 - Tue, Feb 17

10:25 am - 8:05 amORD-LHR

15h 40m1 stop

6:20 am - 4:10 pmLHR-ORD

14h 50m1 stop

$520Delta

Find Deal

Wed, Oct 22 - Wed, Oct 29

1:12 pm - 10:00 amORD-LHR

14h 48m1 stop

2:10 pm - 5:00 pmLHR-ORD

8h 50mnonstop

$525Finnair

Find Deal

Wed, Feb 11 - Tue, Feb 17

10:40 am - 6:50 amMDW-LHR

14h 10m2 stops

10:00 am - 11:32 pmLHR-MDW

19h 32m2 stops

$535Virgin Atlantic

Find Deal

Wed, Nov 5 - Wed, Nov 12

Delta flights from Illinois to London Heathrow Airport

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

Delta

Sep 8

ORD1:25 pmChicago O'Hare Intl

11h 00m

1 stop

LHR6:25 amLondon Heathrow

Sep 16

LHR6:15 amLondon Heathrow

14h 45m

1 stop

ORD3:00 pmChicago O'Hare Intl

$516

Find similar

Delta

Oct 22

ORD10:25 amChicago O'Hare Intl

15h 40m

1 stop

LHR8:05 amLondon Heathrow

Oct 29

LHR6:20 amLondon Heathrow

14h 50m

1 stop

ORD4:10 pmChicago O'Hare Intl

$520

Find similar

Delta

Sep 3

ORD6:20 pmChicago O'Hare Intl

11h 05m

1 stop

LHR11:25 amLondon Heathrow

Sep 12

LHR6:30 amLondon Heathrow

13h 40m

1 stop

ORD2:10 pmChicago O'Hare Intl

$521

Find similar

British Airways flights from Illinois to London Heathrow Airport

Our best British Airways deals on Illinois to London Heathrow Airport flight tickets

British Airways

Oct 7

ORD7:10 pmChicago O'Hare Intl

7h 55m

LHR9:05 amLondon Heathrow

Oct 22

LHR8:00 pmLondon Heathrow

28h 50m

1 stop

ORD6:50 pmChicago O'Hare Intl

$519

Find similar

British Airways

Oct 14

STL5:09 pmLambert-St Louis

11h 41m

1 stop

LHR10:50 amLondon Heathrow

Oct 22

LHR1:30 pmLondon Heathrow

12h 44m

1 stop

STL8:14 pmLambert-St Louis

$529

Find similar

British Airways

Sep 22

ORD8:40 pmChicago O'Hare Intl

7h 50m

LHR10:30 amLondon Heathrow

Sep 30

LHR9:15 amLondon Heathrow

8h 35m

ORD11:50 amChicago O'Hare Intl

$540

Find similar

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 9/20

7:25 pm-11:55 am

1 stop10h 30m

London Heathrow

Sun 11/9

12:15 pm-5:20 pm

1 stop11h 05m

$503

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 11/7

7:20 pm-4:25 pm

2 stops15h 05m

London Heathrow

Thu 11/13

7:05 am-4:45 pm

2 stops15h 40m

$504

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 11/25

9:41 am-7:05 am

1 stop15h 24m

London Heathrow

Thu 12/4

11:05 am-6:07 pm

1 stop13h 02m

$506

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 12/1

5:10 pm-6:55 am

Nonstop7h 45m

London Heathrow

Tue 12/9

7:05 pm-2:30 pm

1 stop25h 25m

$513

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 9/8

1:25 pm-6:25 am

1 stop11h 00m

London Heathrow

Tue 9/16

6:15 am-3:00 pm

1 stop14h 45m

$516

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 9/8

3:09 pm-7:50 am

1 stop10h 41m

London Heathrow

Wed 9/17

6:45 pm-2:15 pm

1 stop25h 30m

$517

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 2/11

5:10 pm-6:55 am

Nonstop7h 45m

London Heathrow

Tue 2/17

3:45 pm-6:45 pm

Nonstop9h 00m

$518

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 10/22

10:25 am-8:05 am

1 stop15h 40m

London Heathrow

Wed 10/29

6:20 am-4:10 pm

1 stop14h 50m

$520

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 2/11

1:12 pm-10:00 am

1 stop14h 48m

London Heathrow

Tue 2/17

2:10 pm-5:00 pm

Nonstop8h 50m

$525

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Wed 11/5

10:40 am-6:50 am

2 stops14h 10m

London Heathrow

Wed 11/12

10:00 am-11:32 pm

2 stops19h 32m

$535

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Illinois 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

Other information

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

The month of February is, on average, the cheapest month to fly to London Heathrow Airport from Illinois, with most prices found around $671. If you’re not able to fly to London Heathrow Airport in February, then April is your next best option. Flight prices from Illinois to London Heathrow Airport during April average around $672.

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 $763. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $903.

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 morning. momondo users have found flights departing from Illinois to London Heathrow Airport in the morning for as low as $673. 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 $826.

What is the cheapest Illinois to London Heathrow flight route?

Fly from Chicago O'Hare Intl to London Heathrow for the best Illinois - 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 Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $792 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 Illinois for as low as $702 on momondo.

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

There are 4 cabin classes available to choose from on Illinois 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 Illinois to London Heathrow Airport flights?

You could potentially save up to 23% on your flight if you consider stops on a Illinois to London Heathrow Airport flight.

When did momondo last update prices for flights from Illinois to London Heathrow Airport?
Prices for flights from Illinois to London Heathrow Airport were last updated today.
How many operators does momondo search for flights from Illinois to London Heathrow Airport?
As of August 2025, there are 17 operators available to choose from for flights from Illinois to London Heathrow Airport.
How old do you have to be to fly from Illinois to London Heathrow Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois 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 Illinois to London Heathrow Airport?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Illinois to London Heathrow Airport is Boeing 787-9 Dreamliner (42.54% of total bookings). The next most popular plane models are Boeing 777 (19.06%), Boeing 787-10 Dreamliner (17.51%), and Boeing 767-300 (14.92%).

Best airlines flying from Illinois to London Heathrow Airport

Compare and see reviews for airlines that fly from Illinois to London Heathrow Airport with momondo

Airline	Rating	Free Cancellation	Price
JetBlue	PriceFrom $51	Free Cancellation	Rating 7.2 2,918 reviews	Search JetBlue flights
SWISS	PriceFrom $257	Free Cancellation	Rating 7.6 1,711 reviews	Search SWISS flights
Scandinavian Airlines	PriceFrom $338	Free Cancellation	Rating 7.4 1,477 reviews	Search Scandinavian Airlines flights
Delta	PriceFrom $345	Free Cancellation	Rating 7.9 7,979 reviews	Search Delta flights
Lufthansa	PriceFrom $400	Free Cancellation	Rating 6.8 7,359 reviews	Search Lufthansa flights
Icelandair	PriceFrom $469	Free Cancellation	Rating 7.0 533 reviews	Search Icelandair flights
TAP AIR PORTUGAL	PriceFrom $508	Free Cancellation	Rating 7.1 1,962 reviews	Search TAP AIR PORTUGAL flights
Aer Lingus	PriceFrom $551	Free Cancellation	Rating 7.2 1,237 reviews	Search Aer Lingus flights
Finnair	PriceFrom $568	Free Cancellation	Rating 7.6 1,320 reviews	Search Finnair flights
British Airways	PriceFrom $571	Free Cancellation	Rating 6.7 7,309 reviews	Search British Airways flights

Hounslow

Gatwick

Luton

Dover

Slough

Milton Keynes

Guildford

Dartford

Crawley

Stansted

Hayes

Chelmsford

Salisbury

Brentwood

Ilford

Folkestone

Swindon

Colchester

Stratford-upon-Avon

Watford

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Illinois to London. momondo saves you time and could save you money on your trip.

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

Yes. momondo allows you to filter the results for Illinois to London flights to just show those with flexible booking policies.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to London from Illinois.

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

Yes. momondo can track prices for Illinois 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.

An easier way to manage your London Heathrow Airport trip

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

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Flights to Belfast City Airportfrom $518

Cheap flights from Illinois to London from $229

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to London departing on 10/24. 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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Delta flights from Illinois to London Heathrow Airport

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

British Airways flights from Illinois to London Heathrow Airport

Our best British Airways deals on Illinois to London Heathrow Airport flight tickets

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

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How to get the cheapest flight ticket from Illinois 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?

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 $763. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $903.

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

What is the cheapest Illinois to London Heathrow flight route?

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

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

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

There are 4 cabin classes available to choose from on Illinois 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 Illinois to London Heathrow Airport flights?

You could potentially save up to 23% on your flight if you consider stops on a Illinois to London Heathrow Airport flight.

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

TAP AIR PORTUGAL, WestJet, and JetBlue are the most popular carriers operating from Illinois to London Heathrow

What airlines fly to London Heathrow Airport?

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

As of August 2025, there are 54 flights per day flying from Illinois to London Heathrow Airport. The most common time of day flights depart is 9:00PM, with 65% of flights taking off in the evening.

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

379 flights are operational weekly from Illinois to London Heathrow Airport as of August 2025. The most popular departure day for this route is Mon, with 15% of flights per week taking off on this day.

How long does it take to fly to London Heathrow Airport?

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

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

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

Best airlines flying from Illinois to London Heathrow Airport

Compare and see reviews for airlines that fly from Illinois to London Heathrow Airport with momondo

Traveling to a place near London?

Why use momondo?

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

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

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

I’m not ready to book a flight from Illinois 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, organize 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