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

409 flights are operational weekly from Illinois to London Heathrow Airport as of April 2026. The most popular departure day for this route is Sun, 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 April 2026, there are 58 flights per day flying from Illinois to London Heathrow Airport. The most common time of day flights depart is 5:00PM, with 63% of flights taking off in the evening.

What airlines fly to London Heathrow Airport?

British Airways, American Airlines and United 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 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 is the cheapest airline that flies from Illinois to London Heathrow?

British Airways, American Airlines, and Iberia are the most popular carriers operating from Illinois to London Heathrow

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

On average, it takes 8h 45m 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 Peoria and into London Heathrow Airport, then the flight time is around 10h 45m.

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 April 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.

$320 Cheap Flights from Illinois to London Heathrow Airport in 2026

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Find the cheapest flights from Illinois to London

Round-trip

One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:25 pm - 8:20 pm

ORD

LHR

18h 55m

1 stop

1:05 pm - 6:15 pm

LHR

ORD

11h 10m

1 stop

$732Icelandair

Fri, May 8 - Tue, May 19

7:15 pm - 8:55 am

ORD

LHR

31h 40m

2 stops

6:40 am - 4:10 pm

LHR

ORD

15h 30m

1 stop

$733Scandinavian Airlines

Tue, Oct 20 - Fri, Oct 23

5:00 pm - 6:50 am

ORD

LHR

7h 50mnonstop

1:10 pm - 3:55 pm

LHR

ORD

8h 45mnonstop

$743British Airways

Sun, Sep 27 - Tue, Oct 6

7:05 pm - 9:05 am

ORD

LHR

8h 00mnonstop

1:10 pm - 3:55 pm

LHR

ORD

8h 45mnonstop

$746British Airways

Wed, Sep 30 - Tue, Oct 6

10:25 am - 6:30 am

MDW

LHR

14h 05m

2 stops

2:05 pm - 9:40 am

LHR

MDW

25h 35m

2 stops

$864Multiple Airlines

Mon, Jun 8 - Mon, Jun 15

10:25 am - 6:30 am

MDW

LHR

14h 05m

2 stops

2:05 pm - 9:40 am

LHR

MDW

25h 35m

2 stops

$866Multiple Airlines

Mon, Jun 8 - Mon, Jun 15

1:22 pm - 7:10 am

MDW

LHR

11h 48m

1 stop

8:40 am - 6:33 pm

LHR

MDW

15h 53m

2 stops

$874Delta

Sun, May 10 - Tue, May 19

5:35 pm - 1:05 pm

MDW

LHR

13h 30m

1 stop

6:30 am - 9:45 pm

LHR

MDW

20h 15m

2 stops

$875Virgin Atlantic

Wed, Oct 21 - Wed, Oct 28

1:24 pm - 7:10 am

MDW

LHR

11h 46m

1 stop

8:40 am - 5:56 pm

LHR

MDW

15h 16m

2 stops

$876Delta

Wed, May 6 - Fri, May 15

10:35 am - 7:10 am

MDW

LHR

14h 35m

2 stops

6:30 am - 9:45 pm

LHR

MDW

20h 15m

2 stops

$879Virgin Atlantic

Wed, Oct 21 - Wed, Oct 28

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Finnair flights from Illinois to London Heathrow Airport

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

Finnair

May 10

ORD10:30 pmChicago O'Hare Intl

7h 45m

LHR12:15 pmLondon Heathrow

May 19

LHR10:20 amLondon Heathrow

13h 30m

1 stop

ORD5:50 pmChicago O'Hare Intl

$812

Finnair

Oct 6

STL9:35 pmLambert-St Louis

8h 00m

LHR11:35 amLondon Heathrow

Oct 13

LHR11:10 amLondon Heathrow

18h 15m

1 stop

STL11:25 pmLambert-St Louis

$887

Finnair

May 3

STL5:21 pmLambert-St Louis

11h 09m

1 stop

LHR10:30 amLondon Heathrow

May 12

LHR4:25 pmLondon Heathrow

9h 05m

STL7:30 pmLambert-St Louis

$1,136

KLM flights from Illinois to London Heathrow Airport

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

KLM

May 10

MDW12:53 pmChicago Midway

11h 32m

1 stop

LHR6:25 amLondon Heathrow

May 19

LHR9:20 amLondon Heathrow

12h 52m

1 stop

MDW4:12 pmChicago Midway

$891

KLM

May 10

MDW12:53 pmChicago Midway

11h 32m

1 stop

LHR6:25 amLondon Heathrow

May 19

LHR9:20 amLondon Heathrow

12h 52m

1 stop

MDW4:12 pmChicago Midway

$892

KLM

May 10

MDW12:53 pmChicago Midway

11h 32m

1 stop

LHR6:25 amLondon Heathrow

May 19

LHR9:20 amLondon Heathrow

12h 52m

1 stop

MDW4:12 pmChicago Midway

$894

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

Fri 5/8

7:25 pm-8:20 pm

1 stop18h 55m

London Heathrow

Tue 5/19

1:05 pm-6:15 pm

1 stop11h 10m

$732

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 10/20

7:15 pm-8:55 am

2 stops31h 40m

London Heathrow

Fri 10/23

6:40 am-4:10 pm

1 stop15h 30m

$733

Quickest round-trip

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 9/27

5:00 pm-6:50 am

Nonstop7h 50m

London Heathrow

Tue 10/6

1:10 pm-3:55 pm

Nonstop8h 45m

$743

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 9/30

7:05 pm-9:05 am

Nonstop8h 00m

London Heathrow

Tue 10/6

1:10 pm-3:55 pm

Nonstop8h 45m

$746

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mon 6/8

10:25 am-6:30 am

2 stops14h 05m

London Heathrow

Mon 6/15

2:05 pm-9:40 am

2 stops25h 35m

$864

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mon 6/8

10:25 am-6:30 am

2 stops14h 05m

London Heathrow

Mon 6/15

2:05 pm-9:40 am

2 stops25h 35m

$866

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Sun 5/10

1:22 pm-7:10 am

1 stop11h 48m

London Heathrow

Tue 5/19

8:40 am-6:33 pm

2 stops15h 53m

$874

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Wed 10/21

5:35 pm-1:05 pm

1 stop13h 30m

London Heathrow

Wed 10/28

6:30 am-9:45 pm

2 stops20h 15m

$875

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Wed 5/6

1:24 pm-7:10 am

1 stop11h 46m

London Heathrow

Fri 5/15

8:40 am-5:56 pm

2 stops15h 16m

$876

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Wed 10/21

10:35 am-7:10 am

2 stops14h 35m

London Heathrow

Wed 10/28

6:30 am-9:45 pm

2 stops20h 15m

$879

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 $780. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $987.

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 $846. 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 $864.

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 from Illinois 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 $798 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 $710 on momondo.

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

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

No. A direct flight is the cheapest option for a flight between Illinois 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	$508
Fastest flight time	7h 45m
Direct flights	Every day

The best one-way flight to London Heathrow Airport from Illinois in the past 72 hours is $508. The best round-trip flight deal from Illinois to London Heathrow Airport found on momondo in the last 72 hours is $941.

The fastest flight from Illinois to London Heathrow Airport takes 7h 45m

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

Search flight deals

Frequently asked questions about flying from Illinois to London Heathrow Airport

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 April 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 (38.39% of total bookings). The next most popular plane models are Boeing 767-300 (24.64%), Boeing 787-10 Dreamliner (16.74%), and Boeing 777 (11.35%).

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 7.1 2,963 reviews	Search JetBlue flights
Scandinavian Airlines	PriceFrom $321	Free Cancellation	Rating 7.4 1,761 reviews	Search Scandinavian Airlines flights
Delta	PriceFrom $345	Free Cancellation	Rating 7.9 8,458 reviews	Search Delta flights
SWISS	PriceFrom $377	Free Cancellation	Rating 7.5 1,924 reviews	Search SWISS flights
TAP AIR PORTUGAL	PriceFrom $428	Free Cancellation	Rating 7.1 2,223 reviews	Search TAP AIR PORTUGAL flights
Icelandair	PriceFrom $476	Free Cancellation	Rating 7.0 642 reviews	Search Icelandair flights
Aer Lingus	PriceFrom $481	Free Cancellation	Rating 7.3 1,533 reviews	Search Aer Lingus flights
Finnair	PriceFrom $513	Free Cancellation	Rating 7.7 1,391 reviews	Search Finnair flights
Alaska Airlines	PriceFrom $522	Free Cancellation	Rating 7.9 12,295 reviews	Search Alaska Airlines flights
British Airways	PriceFrom $531	Free Cancellation	Rating 6.7 7,917 reviews	Search British Airways flights

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Hayes

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Crawley

Slough

Wembley

Stansted

Watford

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Uxbridge

Brentwood

Dartford

Cobham

Folkestone

Romford

Harrow

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 $458

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Flights to Belfast Intl Airportfrom $711

Flights to London Southend Airportfrom $668

Flights to Belfast City Airportfrom $711

Cheap flights from Illinois to London from $328

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 8/23. 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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Finnair flights from Illinois to London Heathrow Airport

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

KLM flights from Illinois to London Heathrow Airport

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

momondo Fare Finder

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 from Illinois to London Heathrow Airport?

What cabin class options are available on Illinois to London Heathrow Airport 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

Fastest flight time

Direct flights

Frequently asked questions about flying 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?

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

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According to popular flight searches on momondo this year

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