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

309 flights are operational weekly from Illinois to London Heathrow Airport as of March 2026. The most popular departure day for this route is Wed, with 15% of flights per week taking off on this day.

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

As of March 2026, there are 44 flights per day flying from Illinois to London Heathrow Airport. The most common time of day flights depart is 5:00PM, with 60% of flights taking off in the evening.

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 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.

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

On average, it takes 9h 30m 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 13h 17m.

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

Icelandair, JetBlue, and British Airways are the most popular carriers operating from Illinois to London Heathrow

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 March 2026, 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.

$346 Cheap Flights from Illinois to London Heathrow Airport in 2026

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Cheap round-trip flights

Enter your travel dates to find the best prices.

6:00 pm - 12:45 pm

ORD

LHR

12h 45m

1 stop

8:00 am - 4:00 pm

LHR

ORD

14h 00m

1 stop

$570TAP AIR PORTUGAL

Wed, Apr 22 - Wed, May 6

7:15 pm - 4:00 pm

ORD

LHR

14h 45m

1 stop

6:40 am - 4:10 pm

LHR

ORD

15h 30m

1 stop

$571Scandinavian Airlines

Mon, Apr 20 - Sat, Apr 25

7:15 pm - 4:00 pm

ORD

LHR

14h 45m

1 stop

6:40 am - 4:10 pm

LHR

ORD

15h 30m

1 stop

$572Scandinavian Airlines

Mon, Apr 27 - Fri, May 1

7:25 pm - 11:55 am

ORD

LHR

10h 30m

1 stop

9:25 pm - 6:15 pm

LHR

ORD

26h 50m

1 stop

$579Icelandair

Sun, May 3 - Sun, May 10

3:30 pm - 12:40 pm

STL

LHR

15h 10m

1 stop

6:30 am - 1:25 pm

LHR

STL

12h 55m

1 stop

$701Lufthansa

Wed, Aug 19 - Fri, Aug 28

12:27 pm - 8:05 am

STL

LHR

13h 38m

1 stop

3:15 pm - 10:19 pm

LHR

STL

13h 04m

1 stop

$704Finnair

Sun, May 3 - Tue, May 12

1:18 pm - 2:40 pm

STL

LHR

19h 22m

2 stops

6:30 am - 1:25 pm

LHR

STL

12h 55m

1 stop

$705Lufthansa

Tue, Sep 8 - Wed, Sep 16

9:30 am - 7:05 am

MDW

LHR

16h 35m

1 stop

6:15 am - 5:22 pm

LHR

MDW

17h 07m

2 stops

$713Virgin Atlantic

Mon, Mar 23 - Tue, Mar 31

9:40 pm - 11:40 am

STL

LHR

8h 00mnonstop

3:15 pm - 10:19 pm

LHR

STL

13h 04m

1 stop

$716Finnair

Sun, May 3 - Tue, May 12

1:10 pm - 9:00 am

MDW

LHR

14h 50m

2 stops

6:15 am - 5:22 pm

LHR

MDW

17h 07m

2 stops

$717Virgin Atlantic

Mon, Mar 23 - Tue, Mar 31

TAP AIR PORTUGAL flights from Illinois to London Heathrow Airport

Our best TAP AIR PORTUGAL deals on Illinois to London Heathrow Airport flight tickets

TAP AIR PORTUGAL

Apr 22

ORD6:00 pmChicago O'Hare Intl

12h 45m

1 stop

LHR12:45 pmLondon Heathrow

May 2

LHR6:00 amLondon Heathrow

16h 05m

1 stop

ORD4:05 pmChicago O'Hare Intl

$570

TAP AIR PORTUGAL

Apr 29

ORD6:00 pmChicago O'Hare Intl

17h 45m

1 stop

LHR5:45 pmLondon Heathrow

May 5

LHR6:45 pmLondon Heathrow

27h 15m

1 stop

ORD4:00 pmChicago O'Hare Intl

$583

TAP AIR PORTUGAL

Apr 12

ORD6:00 pmChicago O'Hare Intl

22h 55m

1 stop

LHR10:55 pmLondon Heathrow

Apr 18

LHR8:00 amLondon Heathrow

14h 05m

1 stop

ORD4:05 pmChicago O'Hare Intl

$590

United Airlines flights from Illinois to London Heathrow Airport

Our best United Airlines deals on Illinois to London Heathrow Airport flight tickets

United Airlines

Mar 23

ORD4:45 pmChicago O'Hare Intl

8h 10m

LHR5:55 amLondon Heathrow

Mar 31

LHR5:50 pmLondon Heathrow

24h 10m

1 stop

ORD12:00 pmChicago O'Hare Intl

$704

United Airlines

Mar 23

ORD6:45 pmChicago O'Hare Intl

8h 10m

LHR7:55 amLondon Heathrow

Mar 31

LHR2:10 pmLondon Heathrow

9h 10m

ORD5:20 pmChicago O'Hare Intl

$720

United Airlines

Mar 23

ORD2:35 pmChicago O'Hare Intl

10h 45m

1 stop

LHR6:20 amLondon Heathrow

Mar 31

LHR8:00 amLondon Heathrow

8h 55m

ORD10:55 amChicago O'Hare Intl

$721

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

Cheapest round-trip

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 4/22

6:00 pm-12:45 pm

1 stop12h 45m

London Heathrow

Wed 5/6

8:00 am-4:00 pm

1 stop14h 00m

$570

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 4/20

7:15 pm-4:00 pm

1 stop14h 45m

London Heathrow

Sat 4/25

6:40 am-4:10 pm

1 stop15h 30m

$571

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 4/27

7:15 pm-4:00 pm

1 stop14h 45m

London Heathrow

Fri 5/1

6:40 am-4:10 pm

1 stop15h 30m

$572

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 5/3

7:25 pm-11:55 am

1 stop10h 30m

London Heathrow

Sun 5/10

9:25 pm-6:15 pm

1 stop26h 50m

$579

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 8/19

3:30 pm-12:40 pm

1 stop15h 10m

London Heathrow

Fri 8/28

6:30 am-1:25 pm

1 stop12h 55m

$701

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 5/3

12:27 pm-8:05 am

1 stop13h 38m

London Heathrow

Tue 5/12

3:15 pm-10:19 pm

1 stop13h 04m

$704

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 9/8

1:18 pm-2:40 pm

2 stops19h 22m

London Heathrow

Wed 9/16

6:30 am-1:25 pm

1 stop12h 55m

$705

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mon 3/23

9:30 am-7:05 am

1 stop16h 35m

London Heathrow

Tue 3/31

6:15 am-5:22 pm

2 stops17h 07m

$713

Quickest round-trip

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 5/3

9:40 pm-11:40 am

Nonstop8h 00m

London Heathrow

Tue 5/12

3:15 pm-10:19 pm

1 stop13h 04m

$716

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mon 3/23

1:10 pm-9:00 am

2 stops14h 50m

London Heathrow

Tue 3/31

6:15 am-5:22 pm

2 stops17h 07m

$717

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 January is, on average, the cheapest month to fly to London Heathrow Airport from Illinois, with most prices found around $619. If you’re not able to fly to London Heathrow Airport in January, then February is your next best option. Flight prices from Illinois to London Heathrow Airport during February average around $638.

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 $759. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $935.

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 Illinois to London Heathrow Airport in the evening for as low as $814. 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 $838.

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 $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 Illinois for as low as $709 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 26% on your flight if you consider stops on a Illinois to London Heathrow Airport flight.

Cheap Illinois to London Heathrow Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to London Heathrow Airport

Best Price Found	$399
Fastest flight time	7h 40m
Direct flights	Mon, Tue, Wed, Thu, Fri and Sun

The best one-way flight to London Heathrow Airport from Illinois in the past 72 hours is $399. The best round-trip flight deal from Illinois to London Heathrow Airport found on momondo in the last 72 hours is $711.

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

Direct flights go from Illinois to London Heathrow Airport on Monday, Tuesday, Wednesday, Thursday, Friday and Sunday. There are no airlines offering direct flights.

Search flight deals

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 March 2026, 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 (38.00% of total bookings). The next most popular plane models are Boeing 767-300 (24.67%), Boeing 787-10 Dreamliner (15.09%), and Boeing 777 (11.44%).

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 2,905 reviews	Search JetBlue flights
SWISS	PriceFrom $257	Free Cancellation	Rating 7.5 1,897 reviews	Search SWISS flights
Scandinavian Airlines	PriceFrom $321	Free Cancellation	Rating 7.3 1,712 reviews	Search Scandinavian Airlines flights
Delta	PriceFrom $345	Free Cancellation	Rating 7.9 8,294 reviews	Search Delta flights
TAP AIR PORTUGAL	PriceFrom $427	Free Cancellation	Rating 7.1 2,166 reviews	Search TAP AIR PORTUGAL flights
Icelandair	PriceFrom $477	Free Cancellation	Rating 7.1 620 reviews	Search Icelandair flights
Aer Lingus	PriceFrom $481	Free Cancellation	Rating 7.2 1,477 reviews	Search Aer Lingus flights
Finnair	PriceFrom $516	Free Cancellation	Rating 7.6 1,371 reviews	Search Finnair flights
Alaska Airlines	PriceFrom $522	Free Cancellation	Rating 8.0 12,041 reviews	Search Alaska Airlines flights
British Airways	PriceFrom $539	Free Cancellation	Rating 6.7 7,786 reviews	Search British Airways flights

Gatwick

Hounslow

Milton Keynes

Luton

Dover

Slough

Crawley

Stratford-upon-Avon

Hayes

Wembley

Dartford

Croydon

Brentwood

Harrow

Watford

Guildford

Stansted

Cobham

Folkestone

Romford

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.

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Flights to London Gatwick Airportfrom $418

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Flights to London Stansted Airportfrom $348

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Flights to Belfast Intl Airportfrom $621

Flights to London Southend Airportfrom $587

Flights to Belfast City Airportfrom $651

Cheap flights from Illinois to London from $346

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 3/28. 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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TAP AIR PORTUGAL flights from Illinois to London Heathrow Airport

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United Airlines flights from Illinois to London Heathrow Airport

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

See travel insights to London from

How to get the cheapest flight ticket from Illinois 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 Illinois to London Heathrow flight route?

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?

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

What is the cheapest airline that flies 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?

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

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

Cheap Illinois to London Heathrow Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to London Heathrow Airport

Best Price Found

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Direct flights

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

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Why use momondo?

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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