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

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

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

As of September 2025, there are 57 flights per day flying from Illinois to London. The most common time of day flights depart is 4:00PM, with 64% of flights taking off in the evening.

What airlines fly to London?

British Airways, Iberia and American Airlines are the top three most popular airlines that fly to London 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. Keep in mind that there are 16 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

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

399 flights are operational weekly from Illinois to London as of September 2025. The most popular departure day for this route is Mon, with 14% of flights per week taking off on this day.

How long does it take to fly to London?

If you’re flying from a popular airport in Illinois, such as Chicago or Moline, and flying into London, then you can expect flight times to average 9h 22m and 11h, respectively.

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

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

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

As of September 2025, there are 16 operators available to choose from for flights from Illinois to London.

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

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.

What documentation or ID do you need to fly to London?

The travel and health documents you'll need for your trip to London 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. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$222 Cheap Flights from Illinois to London in 2025/26

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Find the cheapest flights from Illinois to London

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

6:58 pm - 6:20 amORD-LGW

29h 22m2 stops

2:00 pm - 4:23 pmLGW-ORD

31h 23m1 stop

$510Multiple Airlines

Find Deal

Wed, Oct 15 - Fri, Oct 31

10:25 am - 4:00 pmORD-LHR

23h 35m2 stops

6:40 am - 4:45 pmLHR-ORD

16h 05m1 stop

$511Scandinavian Airlines

Find Deal

Tue, Nov 4 - Sat, Nov 8

7:25 pm - 2:40 pmORD-LGW

13h 15m1 stop

3:40 pm - 6:15 pmLGW-ORD

32h 35m1 stop

$511Icelandair

Find Deal

Thu, Oct 16 - Mon, Oct 20

6:30 pm - 10:55 amORD-LGW

10h 25m1 stop

11:55 am - 5:20 pmLGW-ORD

11h 25m1 stop

$512Icelandair

Find Deal

Sat, Nov 15 - Sun, Nov 23

1:43 pm - 6:20 amORD-LHR

10h 37m1 stop

9:15 am - 11:50 amLHR-ORD

8h 35mnonstop

$512Iberia

Find Deal

Wed, Oct 8 - Tue, Oct 14

5:10 pm - 6:55 amORD-LHR

7h 45mnonstop

11:00 am - 2:50 pmLHR-ORD

8h 50mnonstop

$513British Airways

Find Deal

Mon, Feb 16 - Thu, Mar 12

6:50 pm - 7:15 pmORD-LHR

18h 25m1 stop

9:00 am - 4:20 pmLHR-ORD

13h 20m1 stop

$514SWISS

Find Deal

Sun, Nov 2 - Tue, Nov 11

7:05 pm - 5:55 pmORD-LGW

16h 50m1 stop

6:35 pm - 3:55 pmLGW-ORD

27h 20m1 stop

$516SWISS

Find Deal

Wed, Oct 8 - Tue, Oct 14

7:10 pm - 9:05 amORD-LHR

7h 55mnonstop

1:10 pm - 3:55 pmLHR-ORD

8h 45mnonstop

$519British Airways

Find Deal

Tue, Oct 7 - Wed, Oct 15

11:51 am - 7:00 amSTL-LHR

13h 09m1 stop

10:15 am - 9:00 pmLHR-STL

16h 45m1 stop

$533Iberia

Find Deal

Wed, Nov 12 - Tue, Nov 18

Iberia flights from Illinois to London

Our best Iberia deals on Illinois to London flight tickets

Iberia

Oct 8

ORD1:43 pmChicago O'Hare Intl

10h 37m

1 stop

LHR6:20 amLondon Heathrow

Oct 14

LHR9:15 amLondon Heathrow

8h 35m

ORD11:50 amChicago O'Hare Intl

$512

Find similar

Iberia

Oct 1

ORD1:59 pmChicago O'Hare Intl

10h 21m

1 stop

LHR6:20 amLondon Heathrow

Oct 6

LHR8:00 pmLondon Heathrow

24h 15m

1 stop

ORD2:15 pmChicago O'Hare Intl

$513

Find similar

Iberia

Oct 1

ORD1:59 pmChicago O'Hare Intl

10h 21m

1 stop

LHR6:20 amLondon Heathrow

Oct 22

LHR9:15 amLondon Heathrow

8h 35m

ORD11:50 amChicago O'Hare Intl

$518

Find similar

British Airways flights from Illinois to London

Our best British Airways deals on Illinois to London flight tickets

British Airways

Feb 16

ORD5:10 pmChicago O'Hare Intl

7h 45m

LHR6:55 amLondon Heathrow

Mar 12

LHR11:00 amLondon Heathrow

8h 50m

ORD2:50 pmChicago O'Hare Intl

$513

Find similar

British Airways

Oct 7

ORD7:10 pmChicago O'Hare Intl

7h 55m

LHR9:05 amLondon Heathrow

Oct 15

LHR1:10 pmLondon Heathrow

8h 45m

ORD3:55 pmChicago O'Hare Intl

$519

Find similar

British Airways

Oct 27

ORD10:45 pmChicago O'Hare Intl

7h 50m

LHR11:35 amLondon Heathrow

Nov 3

LHR7:40 pmLondon Heathrow

24h 50m

1 stop

ORD2:30 pmChicago O'Hare Intl

$531

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Wed 10/15

6:58 pm-6:20 am

2 stops29h 22m

London Gatwick

Fri 10/31

2:00 pm-4:23 pm

1 stop31h 23m

$510

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 11/4

10:25 am-4:00 pm

2 stops23h 35m

London Heathrow

Sat 11/8

6:40 am-4:45 pm

1 stop16h 05m

$511

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Thu 10/16

7:25 pm-2:40 pm

1 stop13h 15m

London Gatwick

Mon 10/20

3:40 pm-6:15 pm

1 stop32h 35m

$511

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sat 11/15

6:30 pm-10:55 am

1 stop10h 25m

London Gatwick

Sun 11/23

11:55 am-5:20 pm

1 stop11h 25m

$512

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 10/8

1:43 pm-6:20 am

1 stop10h 37m

London Heathrow

Tue 10/14

9:15 am-11:50 am

Nonstop8h 35m

$512

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 2/16

5:10 pm-6:55 am

Nonstop7h 45m

London Heathrow

Thu 3/12

11:00 am-2:50 pm

Nonstop8h 50m

$513

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 11/2

6:50 pm-7:15 pm

1 stop18h 25m

London Heathrow

Tue 11/11

9:00 am-4:20 pm

1 stop13h 20m

$514

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Wed 10/8

7:05 pm-5:55 pm

1 stop16h 50m

London Gatwick

Tue 10/14

6:35 pm-3:55 pm

1 stop27h 20m

$516

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 10/7

7:10 pm-9:05 am

Nonstop7h 55m

London Heathrow

Wed 10/15

1:10 pm-3:55 pm

Nonstop8h 45m

$519

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 11/12

11:51 am-7:00 am

1 stop13h 09m

London Heathrow

Tue 11/18

10:15 am-9:00 pm

1 stop16h 45m

$533

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Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Illinois to London

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?

The cheapest month to fly to London from Illinois is in February. Flight prices, which tend to average around $651, are often lower during this time because this is during the off-season. The month of September is another great option to travel to London, with average flight prices from Illinois averaging around $659.

What is the cheapest day to depart on your flight to London?

The cheapest day to depart from Illinois to London is on a Tuesday. Travelers who choose to depart for London on a Tuesday will often find tickets for as low as $762. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $908. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from Illinois in the morning is the least expensive time of day to depart. momondo users have found prices as low as $663 when looking at flights departing in the morning. Flights to London are more costly in the afternoon, with an average ticket price of $827. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Illinois to London flight route?

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

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

You are more likely to see cheaper flights to London from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around $793 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Illinois for as low as $694 on momondo.

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

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

You could potentially save up to 11% on your flight if you consider stops on a Illinois to London flight.

Cheap Illinois to London flight deals and tips

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

Best Price Found	$438
Fastest flight time	7h 40m
Direct flights	Every day
Airports in London	1 airport

The best one-way flight to London from Illinois in the past 72 hours is $438. The best round-trip flight deal from Illinois to London found on momondo in the last 72 hours is $636.

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

Direct flights go from Illinois to London every day.

There is 1 airport near London: London Heathrow (LHR)

Search flight deals

When did momondo last update prices for flights from Illinois to London?
Prices for flights from Illinois to London were last updated today.
How many operators does momondo search for flights from Illinois to London?
As of September 2025, there are 16 operators available to choose from for flights from Illinois to London.
How old do you have to be to fly from Illinois to London?
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.
What documentation or ID do you need to fly to London?
The travel and health documents you'll need for your trip to London 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. 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?
Based on momondo bookings for flights between Illinois and London, the leading plane model is Boeing 787-9 Dreamliner, making up 40.62% of the total bookings. Other popular models include Boeing 787-10 Dreamliner with 19.41%, Boeing 777 with 16.58%, and Boeing 767-300 with 14.74%.

Best airlines flying from Illinois to London

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

Airline	Rating	Free Cancellation	Price
JetBlue	PriceFrom $51	Free Cancellation	Rating 7.2 2,912 reviews	Search JetBlue flights
SWISS	PriceFrom $257	Free Cancellation	Rating 7.5 1,740 reviews	Search SWISS flights
Scandinavian Airlines	PriceFrom $338	Free Cancellation	Rating 7.4 1,491 reviews	Search Scandinavian Airlines flights
Delta	PriceFrom $345	Free Cancellation	Rating 7.9 7,966 reviews	Search Delta flights
Lufthansa	PriceFrom $430	Free Cancellation	Rating 6.8 7,419 reviews	Search Lufthansa flights
TAP AIR PORTUGAL	PriceFrom $450	Free Cancellation	Rating 7.1 1,985 reviews	Search TAP AIR PORTUGAL flights
Icelandair	PriceFrom $472	Free Cancellation	Rating 7.0 545 reviews	Search Icelandair flights
British Airways	PriceFrom $502	Free Cancellation	Rating 6.7 7,380 reviews	Search British Airways flights
Aer Lingus	PriceFrom $537	Free Cancellation	Rating 7.2 1,295 reviews	Search Aer Lingus flights
Finnair	PriceFrom $547	Free Cancellation	Rating 7.6 1,326 reviews	Search Finnair flights

Gatwick

Hounslow

Dover

Luton

Slough

Milton Keynes

Hayes

Guildford

Dartford

Crawley

Stansted

Chelmsford

Brentwood

Ilford

Folkestone

Colchester

Watford

Wembley

Richmond

Croydon

Why use momondo?

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

Finding the right flight to London from Illinois is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.

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

momondo does allow users to show only those flights to London from Illinois which offer a flexible booking policy as well as other useful filters and features.

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

momondo helps you find the best flight between Illinois and London by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

If you are not ready to book a flight from Illinois 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.

An easier way to manage your London 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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Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

London City Airport

London Gatwick Airport

London Heathrow Airport

London Luton Airport

London Southend Airport

London Stansted Airport

Popular cities in the United Kingdom

Flights to Manchesterfrom $393

Flights to Edinburghfrom $389

Flights to Glasgowfrom $394

Flights to Birminghamfrom $388

Flights to Newcastle upon Tynefrom $434

Flights to Belfastfrom $460

Flights to Bristolfrom $471

Flights to Invernessfrom $389

Flights to Liverpoolfrom $452

Flights to Aberdeenfrom $476

Flights to Leedsfrom $419

Flights to Cardifffrom $430

Cheap flights from Illinois to London from $222

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 10/20. 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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Big names and deals

Filter for what you want

Filter for what you want

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Find the cheapest flights from Illinois to London

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Iberia flights from Illinois to London

Our best Iberia deals on Illinois to London flight tickets

British Airways flights from Illinois to London

Our best British Airways deals on Illinois to London flight tickets

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

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How to get the cheapest flight ticket from Illinois to London

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?

What is the cheapest day to depart on your flight to London?

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

What is the cheapest Illinois to London flight route?

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

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

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

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

You could potentially save up to 11% on your flight if you consider stops on a Illinois to London flight.

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

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

What airlines fly to London?

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

As of September 2025, there are 57 flights per day flying from Illinois to London. The most common time of day flights depart is 4:00PM, with 64% of flights taking off in the evening.

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

399 flights are operational weekly from Illinois to London as of September 2025. The most popular departure day for this route is Mon, with 14% of flights per week taking off on this day.

How long does it take to fly to London?

If you’re flying from a popular airport in Illinois, such as Chicago or Moline, and flying into London, then you can expect flight times to average 9h 22m and 11h, respectively.

Cheap Illinois to London flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in London

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

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

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

What documentation or ID do you need to fly to London?

What is the most popular plane model from Illinois to London?

Best airlines flying from Illinois to London

Compare and see reviews for airlines that fly from Illinois to London 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 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 the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London