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

The number of flights available between London and Illinois is 51 per day as of August 2025. The most frequent departure time is 2:00PM, with 54% of daily flights leaving in the afternoon.

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

The number of flights available between London and Illinois is 362 per week as of August 2025. The most frequent departure day is Sat, with 15% of weekly flights leaving on this day.

What airlines fly to Illinois?

British Airways, American Airlines and Aer Lingus are the top three most popular airlines that fly to Illinois from London according to our data. British Airways is the first choice among our users, with 53% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 11 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

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

Prices for flights from London to Illinois refresh daily.

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

The number of operators available for flights from London to Illinois is 11 as of August 2025.

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

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Illinois.

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

The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$248 Cheap Flights from London to Illinois in 2025

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Find the cheapest flights from London to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

5:50 pm - 12:55 pmLHR-ORD

25h 05m2 stops

5:55 pm - 5:05 pmORD-LHR

17h 10m1 stop

$407Brussels Airlines

Find Deal

Mon, Sep 15 - Mon, Sep 22

2:00 pm - 4:12 pmLGW-ORD

32h 12m1 stop

5:17 pm - 10:00 amORD-LGW

34h 43m1 stop

$408

Find Deal

Wed, Sep 10 - Sun, Sep 21

3:40 pm - 9:15 pmLGW-ORD

11h 35m1 stop

7:25 pm - 11:45 amORD-LGW

10h 20m1 stop

$459Icelandair

Find Deal

Fri, Aug 29 - Fri, Sep 5

3:40 pm - 9:15 pmLGW-ORD

11h 35m1 stop

7:25 pm - 2:40 pmORD-LGW

13h 15m1 stop

$460Icelandair

Find Deal

Thu, Sep 11 - Tue, Sep 23

7:40 am - 2:00 pmLHR-ORD

12h 20m1 stop

9:15 pm - 1:25 pmORD-LHR

10h 10m1 stop

$474Aer Lingus

Find Deal

Sat, Sep 20 - Sat, Oct 11

1:25 pm - 7:00 pmLHR-ORD

11h 35m1 stop

9:15 pm - 1:25 pmORD-LHR

10h 10m1 stop

$476Aer Lingus

Find Deal

Fri, Sep 19 - Sun, Oct 12

10:30 am - 7:55 pmLHR-ORD

15h 25m1 stop

10:30 pm - 6:40 pmORD-LHR

14h 10m1 stop

$495Lufthansa

Find Deal

Wed, Sep 17 - Sun, Sep 28

1:30 pm - 8:05 pmLHR-ORD

12h 35m1 stop

10:35 pm - 5:50 pmORD-LHR

13h 15m1 stop

$500Lufthansa

Find Deal

Fri, Nov 14 - Sun, Nov 23

6:50 am - 12:05 pmLHR-ORD

11h 15m1 stop

6:00 pm - 6:30 amORD-LHR

30h 30m1 stop

$527United Airlines

Find Deal

Sat, Sep 13 - Sat, Sep 13

9:30 am - 11:44 pmLHR-STL

20h 14m2 stops

6:00 am - 5:55 amSTL-LHR

17h 55m1 stop

$883United Airlines

Find Deal

Wed, Sep 3 - Wed, Sep 24

Aer Lingus flights from London to Illinois

Our best Aer Lingus deals on London to Illinois flight tickets

Aer Lingus

Sep 20

LHR7:40 amLondon Heathrow

12h 20m

1 stop

ORD2:00 pmChicago O'Hare Intl

Oct 11

ORD9:15 pmChicago O'Hare Intl

10h 10m

1 stop

LHR1:25 pmLondon Heathrow

$474

Find similar

Aer Lingus

Sep 19

LHR1:25 pmLondon Heathrow

11h 35m

1 stop

ORD7:00 pmChicago O'Hare Intl

Oct 12

ORD9:15 pmChicago O'Hare Intl

10h 10m

1 stop

LHR1:25 pmLondon Heathrow

$476

Find similar

Aer Lingus

Aug 31

LHR8:50 amLondon Heathrow

11h 10m

1 stop

ORD2:00 pmChicago O'Hare Intl

Sep 21

ORD3:45 pmChicago O'Hare Intl

11h 20m

1 stop

LHR9:05 amLondon Heathrow

$478

Find similar

TAP AIR PORTUGAL flights from London to Illinois

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

TAP AIR PORTUGAL

Sep 10

LHR6:45 pmLondon Heathrow

22h 10m

1 stop

ORD10:55 amChicago O'Hare Intl

Sep 21

ORD6:00 pmChicago O'Hare Intl

12h 45m

1 stop

LHR12:45 pmLondon Heathrow

$502

Find similar

TAP AIR PORTUGAL

Nov 6

LHR7:55 pmLondon Heathrow

25h 20m

1 stop

ORD3:15 pmChicago O'Hare Intl

Nov 12

ORD7:10 pmChicago O'Hare Intl

14h 20m

1 stop

LHR3:30 pmLondon Heathrow

$503

Find similar

TAP AIR PORTUGAL

Nov 6

LHR4:30 pmLondon Heathrow

28h 45m

1 stop

ORD3:15 pmChicago O'Hare Intl

Nov 9

ORD8:25 pmChicago O'Hare Intl

19h 10m

1 stop

LHR9:35 pmLondon Heathrow

$506

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 9/15

5:50 pm-12:55 pm

2 stops25h 05m

Chicago O'Hare Intl

Mon 9/22

5:55 pm-5:05 pm

1 stop17h 10m

$407

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 9/10

2:00 pm-4:12 pm

1 stop32h 12m

Chicago O'Hare Intl

Sun 9/21

5:17 pm-10:00 am

1 stop34h 43m

$408

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Fri 8/29

3:40 pm-9:15 pm

1 stop11h 35m

Chicago O'Hare Intl

Fri 9/5

7:25 pm-11:45 am

1 stop10h 20m

$459

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 9/11

3:40 pm-9:15 pm

1 stop11h 35m

Chicago O'Hare Intl

Tue 9/23

7:25 pm-2:40 pm

1 stop13h 15m

$460

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 9/20

7:40 am-2:00 pm

1 stop12h 20m

Chicago O'Hare Intl

Sat 10/11

9:15 pm-1:25 pm

1 stop10h 10m

$474

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 9/19

1:25 pm-7:00 pm

1 stop11h 35m

Chicago O'Hare Intl

Sun 10/12

9:15 pm-1:25 pm

1 stop10h 10m

$476

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 9/17

10:30 am-7:55 pm

1 stop15h 25m

Chicago O'Hare Intl

Sun 9/28

10:30 pm-6:40 pm

1 stop14h 10m

$495

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 11/14

1:30 pm-8:05 pm

1 stop12h 35m

Chicago O'Hare Intl

Sun 11/23

10:35 pm-5:50 pm

1 stop13h 15m

$500

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 9/13

6:50 am-12:05 pm

1 stop11h 15m

Chicago O'Hare Intl

Sat 9/13

6:00 pm-6:30 am

1 stop30h 30m

$527

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/3

9:30 am-11:44 pm

2 stops20h 14m

Lambert-St Louis

Wed 9/24

6:00 am-5:55 am

1 stop17h 55m

$883

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 London to Illinois

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 Illinois?

The cheapest month to fly to Illinois from London is in February. Flight prices, which tend to average around $579, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of February, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $607.

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

The cheapest day to depart from London to Illinois is on a Wednesday when prices can be found for as low as $789. Flights from London to Illinois on a Sunday will generally be more expensive and average around $938. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from London to Illinois during this time can be as low as $620. Flights in the afternoon are often more expensive with an average ticket price of $954.

What is the cheapest London to Illinois flight route?

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

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

You are more likely to see cheaper flights to Illinois from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $738 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from London for as low as $694 on momondo.

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

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

No. A direct flight is the cheapest option for a flight between London to Illinois.

Cheap London to Illinois flight deals and tips

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

Best Price Found	$248
Fastest flight time	9h 00m
Direct flights	Every day
Airports in Illinois	3 airports

The best one-way flight to Illinois from London in the past 72 hours is $248. The best round-trip flight deal from London to Illinois found on momondo in the last 72 hours is $407.

The fastest flight from London to Illinois takes 9h 00m

Direct flights go from London to Illinois every day.

There are 3 airports near Illinois: Chicago O'Hare Intl (ORD), Chicago Midway (MDW), Lambert-St Louis (STL)

Search flight deals

When did momondo last update prices for flights from London to Illinois?
Prices for flights from London to Illinois refresh daily.
How many operators does momondo search for flights from London to Illinois?
The number of operators available for flights from London to Illinois is 11 as of August 2025.
How old do you have to be to fly from London to Illinois?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Illinois.
What documentation or ID do you need to fly to Illinois?
The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from London to Illinois?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from London to Illinois is Boeing 767-300 (47.78% of total bookings). The next most popular plane models are Boeing 787-10 Dreamliner (15.01%), Boeing 777 (14.01%), and Boeing 777-300ER (5.14%).

Best airlines flying from London to Illinois

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

Airline	Rating	Free Cancellation	Price
Icelandair	PriceFrom $390	Free Cancellation	Rating 7.0 520 reviews	Search Icelandair flights
Scandinavian Airlines	PriceFrom $462	Free Cancellation	Rating 7.3 1,457 reviews	Search Scandinavian Airlines flights
United Airlines	PriceFrom $485	Free Cancellation	Rating 7.4 8,904 reviews	Search United Airlines flights
British Airways	PriceFrom $552	Free Cancellation	Rating 6.6 7,224 reviews	Search British Airways flights
TAP AIR PORTUGAL	PriceFrom $558	Free Cancellation	Rating 7.1 1,936 reviews	Search TAP AIR PORTUGAL flights
Aer Lingus	PriceFrom $568	Free Cancellation	Rating 7.1 1,193 reviews	Search Aer Lingus flights
Iberia	PriceFrom $582	Free Cancellation	Rating 7.0 2,862 reviews	Search Iberia flights
American Airlines	PriceFrom $583	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Austrian Airlines	PriceFrom $586	Free Cancellation	Rating 7.6 823 reviews	Search Austrian Airlines flights
Finnair	PriceFrom $607	Free Cancellation	Rating 7.6 1,317 reviews	Search Finnair flights

Why use momondo?

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

It is quick and easy to find London to Illinois flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Illinois that suits you.

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

Flights from London to Illinois 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 London to Illinois?

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 Illinois from London.

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

Of course. momondo tracks the price of London to Illinois flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Illinois 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 Illinois

Popular cities in Illinois

Flights to New Yorkfrom $48

Flights to Los Angelesfrom $37

Flights to Miamifrom $58

Flights to Chicagofrom $58

Flights to Orlandofrom $54

Flights to Las Vegasfrom $30

Flights to San Franciscofrom $61

Flights to Washington, D.C.from $48

Flights to Bostonfrom $67

Flights to Atlantafrom $39

Flights to Dallasfrom $55

Flights to Seattlefrom $94

Cheap flights from London to Illinois from $248

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Illinois departing on 9/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from London to Illinois

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Aer Lingus flights from London to Illinois

Our best Aer Lingus deals on London to Illinois flight tickets

TAP AIR PORTUGAL flights from London to Illinois

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

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

See travel insights to Illinois from

How to get the cheapest flight ticket from London to Illinois

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 Illinois?

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

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

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from London to Illinois during this time can be as low as $620. Flights in the afternoon are often more expensive with an average ticket price of $954.

What is the cheapest London to Illinois flight route?

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

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

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

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

No. A direct flight is the cheapest option for a flight between London to Illinois.

What airlines fly to Illinois?

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

The number of flights available between London and Illinois is 51 per day as of August 2025. The most frequent departure time is 2:00PM, with 54% of daily flights leaving in the afternoon.

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

The number of flights available between London and Illinois is 362 per week as of August 2025. The most frequent departure day is Sat, with 15% of weekly flights leaving on this day.

Cheap London to Illinois flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in Illinois

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

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

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

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

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

Best airlines flying from London to Illinois

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

Why use momondo?

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

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

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

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

An easier way to manage your Illinois 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 Illinois

Popular cities in Illinois

Popular flights according to clicks in the last 7 days on momondo