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

The number of flights available between London and Illinois is 39 per day as of December 2025. The most frequent departure time is 12:00, with 65% of daily flights leaving in the afternoon.

Which airlines fly to Illinois?

British Airways, Lufthansa and Icelandair 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 68% of people opting to fly with this airline when travelling to Illinois. Keep in mind that there are 14 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

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

The number of flights available between London and Illinois is 277 per week as of December 2025. The most frequent departure day is Wed, with 18% of weekly flights leaving on this day.

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

Lufthansa, Finnair, and JetBlue are the most popular carriers operating from London to Illinois

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

Prices for flights from London to Illinois are refreshed on a daily basis.

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

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

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.

£237 Cheap Flights from London to Illinois in 2025/26

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Find the cheapest flights from London to Illinois

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One-way

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Cheap return flights

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14:00 - 23:33

LGW

STL

15h 33m1 stop

10:16 - 10:00

STL

LGW

17h 44m1 stop

£351Multiple Airlines

Thu, 22 Jan - Mon, 26 Jan

14:00 - 23:33

LGW

STL

15h 33m1 stop

11:18 - 10:00

STL

LGW

16h 42m1 stop

£381Multiple Airlines

Fri, 30 Jan - Fri, 6 Feb

20:35 - 18:20

LHR

ORD

26h 45m1 stop

19:25 - 11:55

ORD

LHR

10h 30m1 stop

£450Icelandair

Mon, 16 Mar - Thu, 23 Apr

20:35 - 17:20

LHR

ORD

26h 45m1 stop

19:25 - 11:55

ORD

LHR

10h 30m1 stop

£455Icelandair

Wed, 4 Mar - Tue, 31 Mar

09:10 - 19:15

LCY

ORD

16h 05m1 stop

21:00 - 18:35

ORD

LCY

15h 35m1 stop

£457British Airways

Thu, 22 Jan - Mon, 26 Jan

08:50 - 15:55

LHR

ORD

37h 05m2 stops

12:07 - 09:05

ORD

LHR

14h 58m1 stop

£457British Airways

Thu, 7 May - Mon, 11 May

15:35 - 14:29

LHR

ORD

28h 54m1 stop

11:40 - 06:20

ORD

LHR

12h 40m1 stop

£460Finnair

Thu, 8 Jan - Wed, 25 Feb

11:10 - 22:58

LHR

STL

17h 48m2 stops

09:57 - 06:40

STL

LHR

14h 43m2 stops

£464United Airlines

Sun, 1 Feb - Sun, 8 Feb

08:30 - 19:27

LHR

STL

16h 57m2 stops

13:15 - 09:10

STL

LHR

13h 55m2 stops

£465United Airlines

Thu, 22 Jan - Mon, 26 Jan

17:00 - 09:03

LHR

STL

22h 03m2 stops

17:04 - 11:40

STL

LHR

12h 36m1 stop

£491Finnair

Tue, 13 Jan - Fri, 23 Jan

Icelandair flights from London to Illinois

Our best Icelandair deals on London to Illinois flight tickets

Icelandair

16 Mar

LHR20:35London Heathrow

26h 45m

1 stop

ORD18:20Chicago O'Hare Intl

22 Apr

ORD19:25Chicago O'Hare Intl

10h 30m

1 stop

LHR11:55London Heathrow

£450

Find similar

Icelandair

7 May

LGW13:00London Gatwick

11h 15m

1 stop

ORD18:15Chicago O'Hare Intl

11 May

ORD19:25Chicago O'Hare Intl

10h 20m

1 stop

LGW11:45London Gatwick

£464

Find similar

Icelandair

18 Feb

LGW11:55London Gatwick

11h 25m

1 stop

ORD17:20Chicago O'Hare Intl

18 Mar

ORD19:30Chicago O'Hare Intl

10h 25m

1 stop

LGW10:55London Gatwick

£465

Find similar

Scandinavian Airlines flights from London to Illinois

Our best Scandinavian Airlines deals on London to Illinois flight tickets

Scandinavian Airlines

2 Mar

LHR10:20London Heathrow

12h 25m

1 stop

ORD16:45Chicago O'Hare Intl

10 Mar

ORD13:37Chicago O'Hare Intl

23h 53m

2 stops

LHR18:30London Heathrow

£453

Find similar

Scandinavian Airlines

21 Feb

LHR10:20London Heathrow

12h 25m

1 stop

ORD16:45Chicago O'Hare Intl

3 Mar

ORD10:36Chicago O'Hare Intl

25h 54m

2 stops

LHR18:30London Heathrow

£454

Find similar

Scandinavian Airlines

20 Jan

LHR19:50London Heathrow

26h 55m

2 stops

ORD16:45Chicago O'Hare Intl

7 Apr

ORD10:40Chicago O'Hare Intl

16h 40m

2 stops

LHR09:20London Heathrow

£455

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Thu 22/1

14:00-23:33

1 stop15h 33m

Lambert-St Louis

Mon 26/1

10:16-10:00

1 stop17h 44m

£351

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Fri 30/1

14:00-23:33

1 stop15h 33m

Lambert-St Louis

Fri 6/2

11:18-10:00

1 stop16h 42m

£381

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 16/3

20:35-18:20

1 stop26h 45m

Chicago O'Hare Intl

Thu 23/4

19:25-11:55

1 stop10h 30m

£450

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 4/3

20:35-17:20

1 stop26h 45m

Chicago O'Hare Intl

Tue 31/3

19:25-11:55

1 stop10h 30m

£455

LondonChicago

LCY - ORD

LCYORD

London City

Thu 22/1

09:10-19:15

1 stop16h 05m

Chicago O'Hare Intl

Mon 26/1

21:00-18:35

1 stop15h 35m

£457

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 7/5

08:50-15:55

2 stops37h 05m

Chicago O'Hare Intl

Mon 11/5

12:07-09:05

1 stop14h 58m

£457

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 8/1

15:35-14:29

1 stop28h 54m

Chicago O'Hare Intl

Wed 25/2

11:40-06:20

1 stop12h 40m

£460

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 1/2

11:10-22:58

2 stops17h 48m

Lambert-St Louis

Sun 8/2

09:57-06:40

2 stops14h 43m

£464

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 22/1

08:30-19:27

2 stops16h 57m

Lambert-St Louis

Mon 26/1

13:15-09:10

2 stops13h 55m

£465

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 13/1

17:00-09:03

2 stops22h 03m

Lambert-St Louis

Fri 23/1

17:04-11:40

1 stop12h 36m

£490

Flights are sorted by cheapest return flights first.

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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 month of February is, on average, the cheapest month to fly to Illinois from London, with most prices found around £430. If you aren’t able to travel to Illinois during the month of February, then flying in September is also cheap. Prices for this month can be found on momondo for an average of £435.

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

The cheapest day to depart on your flight to Illinois is on a Wednesday when prices can be found for as low as £615. This is often the case because there is less demand to fly during this day of the week. Flights from London to Illinois on a Saturday will generally be more expensive and average around £669. 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 data shows that the cheapest London to Illinois flights are usually those with departure times in the evening. Our users have found flights to Illinois in the evening for as low as £558. In the afternoon is when there is more demand to fly to Illinois, so prices are often more expensive at around £666 per ticket.

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 £543 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from London for as low as £520 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?

You could potentially save up to 8% on your flight if you consider stops on a London to Illinois flight.

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	£449
Fastest flight time	8h 25m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from London in the past 72 hours is £449. The best return flight deal from London to Illinois found on momondo in the last 72 hours is £546.

The fastest flight from London to Illinois takes 8h 25m

Direct flights go from London to Illinois every day.

There are 98 airports in Illinois. From London there are direct flights to Chicago O'Hare Intl (ORD), 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 are refreshed on a daily basis.
How many operators does momondo search for flights from London to Illinois?
As of December 2025, there are 16 operators available to choose from for flights from London to Illinois.
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?
momondo data reveals that the most frequently booked plane model on the route from London to Illinois is Boeing 767-300, representing 34.59% of all bookings. The subsequent popular models are Boeing 787-9 Dreamliner at 21.28%, Boeing 777 at 12.60%, and Boeing 787-10 Dreamliner at 11.13%.

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 £315	Free Cancellation	Rating 7.0 591 reviews	Search Icelandair flights
Virgin Atlantic	PriceFrom £346	Free Cancellation	Rating 7.5 675 reviews	Search Virgin Atlantic flights
Scandinavian Airlines	PriceFrom £361	Free Cancellation	Rating 7.4 1,606 reviews	Search Scandinavian Airlines flights
Aer Lingus	PriceFrom £367	Free Cancellation	Rating 7.2 1,395 reviews	Search Aer Lingus flights
TAP AIR PORTUGAL	PriceFrom £371	Free Cancellation	Rating 7.2 2,091 reviews	Search TAP AIR PORTUGAL flights
Brussels Airlines	PriceFrom £387	Free Cancellation	Rating 7.2 375 reviews	Search Brussels Airlines flights
Lufthansa	PriceFrom £396	Free Cancellation	Rating 6.8 7,634 reviews	Search Lufthansa flights
British Airways	PriceFrom £405	Free Cancellation	Rating 6.7 7,585 reviews	Search British Airways flights
Austrian Airlines	PriceFrom £406	Free Cancellation	Rating 7.6 879 reviews	Search Austrian Airlines flights
United Airlines	PriceFrom £411	Free Cancellation	Rating 7.4 9,091 reviews	Search United Airlines flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Illinois for you.

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

All flight searches from London to Illinois on momondo can be filtered to show those which offer flexible booking policies.

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?

Yes. momondo can track prices for London to Illinois 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 Illinois trip

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Find better results for your trip to Illinois

Popular Cities in Illinois

Flights to New Yorkfrom £267

Flights to Orlandofrom £262

Flights to Los Angelesfrom £354

Flights to Miamifrom £359

Flights to San Franciscofrom £357

Flights to Bostonfrom £286

Flights to Chicagofrom £357

Flights to Las Vegasfrom £399

Flights to Washington, D.C.from £333

Flights to Atlantafrom £357

Flights to Dallasfrom £381

Flights to Houstonfrom £375

Cheap flights from London to Illinois from £268

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 24/1. 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, great deals

Big names, great deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

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Find the cheapest flights from London to Illinois

Cheap return flights

Cheap one-way flights

Cheap last-minute flights

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Icelandair flights from London to Illinois

Our best Icelandair deals on London to Illinois flight tickets

Scandinavian Airlines flights from London to Illinois

Our best Scandinavian Airlines 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

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?

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?

You could potentially save up to 8% on your flight if you consider stops on a London to Illinois flight.

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

Lufthansa, Finnair, and JetBlue are the most popular carriers operating from London to Illinois

Which 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 39 per day as of December 2025. The most frequent departure time is 12:00, with 65% 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 277 per week as of December 2025. The most frequent departure day is Wed, with 18% 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, organise 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