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

The number of flights available between London and Illinois is 150 per week as of October 2025. The most frequent departure day is Thu, with 28% of weekly flights leaving on this day.

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

Lufthansa, British Airways, and United Airlines are the most popular carriers operating from London to Illinois

Which airlines fly to Illinois?

British Airways, Lufthansa and Finnair 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 66% 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 day?

The number of flights available between London and Illinois is 21 per day as of October 2025. The most frequent departure time is 14:00, with 59% of daily flights leaving in the afternoon.

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 October 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.

£190 Cheap Flights from London to Illinois in 2025/26

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06:40 - 16:45LHR-ORD

16h 05m1 stop

19:20 - 16:00ORD-LHR

14h 40m1 stop

£404Scandinavian Airlines

Find Deal

Thu, 13 Nov - Sun, 23 Nov

06:50 - 17:20LTN-ORD

16h 30m2 stops

18:30 - 23:05ORD-LTN

22h 35m2 stops

£404Multiple Airlines

Find Deal

Wed, 26 Nov - Wed, 3 Dec

11:55 - 17:20LGW-ORD

11h 25m1 stop

18:30 - 10:55ORD-LGW

10h 25m1 stop

£425Icelandair

Find Deal

Wed, 26 Nov - Wed, 3 Dec

12:15 - 17:20LHR-ORD

11h 05m1 stop

18:30 - 10:50ORD-LHR

10h 20m1 stop

£428Icelandair

Find Deal

Tue, 25 Nov - Tue, 2 Dec

11:55 - 19:30LHR-STL

13h 35m1 stop

15:59 - 10:00STL-LHR

12h 01m1 stop

£548British Airways

Find Deal

Wed, 26 Nov - Wed, 3 Dec

10:05 - 19:29LHR-STL

15h 24m1 stop

18:02 - 12:20STL-LHR

12h 18m1 stop

£556Finnair

Find Deal

Tue, 13 Jan - Fri, 23 Jan

18:10 - 19:29LHR-STL

31h 19m2 stops

11:55 - 11:40STL-LHR

17h 45m1 stop

£559Finnair

Find Deal

Tue, 13 Jan - Fri, 23 Jan

14:45 - 23:12LHR-STL

14h 27m1 stop

15:37 - 10:00STL-LHR

12h 23m1 stop

£568British Airways

Find Deal

Tue, 13 Jan - Fri, 23 Jan

08:50 - 23:04LHR-STL

20h 14m2 stops

06:00 - 09:05STL-LHR

21h 05m2 stops

£615Aer Lingus

Find Deal

Mon, 24 Nov - Mon, 1 Dec

12:10 - 23:56LHR-STL

17h 46m2 stops

06:00 - 08:05STL-LHR

20h 05m2 stops

£617Aer Lingus

Find Deal

Mon, 24 Nov - Mon, 1 Dec

SWISS flights from London to Illinois

Our best SWISS deals on London to Illinois flight tickets

SWISS

25 Nov

LCY09:15London City

13h 05m

1 stop

ORD16:20Chicago O'Hare Intl

2 Dec

ORD18:50Chicago O'Hare Intl

12h 05m

1 stop

LCY12:55London City

£491

Find similar

SWISS

25 Nov

LCY19:10London City

23h 35m

1 stop

ORD12:45Chicago O'Hare Intl

1 Dec

ORD16:10Chicago O'Hare Intl

14h 45m

1 stop

LCY12:55London City

£511

Find similar

SWISS

4 Dec

LCY09:15London City

13h 05m

1 stop

ORD16:20Chicago O'Hare Intl

8 Dec

ORD18:50Chicago O'Hare Intl

12h 05m

1 stop

LCY12:55London City

£513

Find similar

Icelandair flights from London to Illinois

Our best Icelandair deals on London to Illinois flight tickets

Icelandair

26 Nov

LGW11:55London Gatwick

11h 25m

1 stop

ORD17:20Chicago O'Hare Intl

3 Dec

ORD18:30Chicago O'Hare Intl

10h 25m

1 stop

LGW10:55London Gatwick

£425

Find similar

Icelandair

25 Nov

LHR12:15London Heathrow

11h 05m

1 stop

ORD17:20Chicago O'Hare Intl

2 Dec

ORD18:30Chicago O'Hare Intl

10h 20m

1 stop

LHR10:50London Heathrow

£428

Find similar

Icelandair

25 Nov

LGW11:55London Gatwick

11h 25m

1 stop

ORD17:20Chicago O'Hare Intl

9 Dec

ORD18:30Chicago O'Hare Intl

10h 25m

1 stop

LGW10:55London Gatwick

£431

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 13/11

06:40-16:45

1 stop16h 05m

Chicago O'Hare Intl

Sun 23/11

19:20-16:00

1 stop14h 40m

£404

LondonChicago

LTN - ORD

LTNORD

London Luton

Wed 26/11

06:50-17:20

2 stops16h 30m

Chicago O'Hare Intl

Wed 3/12

18:30-23:05

2 stops22h 35m

£404

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 26/11

11:55-17:20

1 stop11h 25m

Chicago O'Hare Intl

Wed 3/12

18:30-10:55

1 stop10h 25m

£425

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 25/11

12:15-17:20

1 stop11h 05m

Chicago O'Hare Intl

Tue 2/12

18:30-10:50

1 stop10h 20m

£428

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 26/11

11:55-19:30

1 stop13h 35m

Lambert-St Louis

Wed 3/12

15:59-10:00

1 stop12h 01m

£548

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 13/1

10:05-19:29

1 stop15h 24m

Lambert-St Louis

Fri 23/1

18:02-12:20

1 stop12h 18m

£556

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 13/1

18:10-19:29

2 stops31h 19m

Lambert-St Louis

Fri 23/1

11:55-11:40

1 stop17h 45m

£559

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 13/1

14:45-23:12

1 stop14h 27m

Lambert-St Louis

Fri 23/1

15:37-10:00

1 stop12h 23m

£568

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 24/11

08:50-23:04

2 stops20h 14m

Lambert-St Louis

Mon 1/12

06:00-09:05

2 stops21h 05m

£615

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 24/11

12:10-23:56

2 stops17h 46m

Lambert-St Louis

Mon 1/12

06:00-08:05

2 stops20h 05m

£617

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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 £439. 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 £443.

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 £623. 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 £685. 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 £567. In the afternoon is when there is more demand to fly to Illinois, so prices are often more expensive at around £684 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 £555 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 £526 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 17% 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	£457
Fastest flight time	8h 25m
Direct flights	Every day
Airports in Illinois	1 airport

The best one-way flight to Illinois from London in the past 72 hours is £457. The best return flight deal from London to Illinois found on momondo in the last 72 hours is £563.

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

Direct flights go from London to Illinois every day.

There is 1 airport near Illinois: Chicago O'Hare Intl (ORD)

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 October 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 43.52% of all bookings. The subsequent popular models are Boeing 787-10 Dreamliner at 13.74%, Boeing 777 at 13.67%, and Boeing 787-9 Dreamliner at 5.49%.

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 £320	Free Cancellation	Rating 7.1 562 reviews	Search Icelandair flights
Virgin Atlantic	PriceFrom £351	Free Cancellation	Rating 7.5 671 reviews	Search Virgin Atlantic flights
Scandinavian Airlines	PriceFrom £362	Free Cancellation	Rating 7.4 1,548 reviews	Search Scandinavian Airlines flights
TAP AIR PORTUGAL	PriceFrom £375	Free Cancellation	Rating 7.1 2,040 reviews	Search TAP AIR PORTUGAL flights
Aer Lingus	PriceFrom £377	Free Cancellation	Rating 7.2 1,365 reviews	Search Aer Lingus flights
Brussels Airlines	PriceFrom £393	Free Cancellation	Rating 7.2 369 reviews	Search Brussels Airlines flights
Lufthansa	PriceFrom £404	Free Cancellation	Rating 6.8 7,543 reviews	Search Lufthansa flights
Austrian Airlines	PriceFrom £412	Free Cancellation	Rating 7.6 862 reviews	Search Austrian Airlines flights
British Airways	PriceFrom £412	Free Cancellation	Rating 6.7 7,489 reviews	Search British Airways flights
United Airlines	PriceFrom £416	Free Cancellation	Rating 7.4 8,995 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

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.

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Find better results for your trip to Illinois

Popular Cities in Illinois

Flights to New Yorkfrom £250

Flights to Orlandofrom £237

Flights to Los Angelesfrom £350

Flights to Miamifrom £348

Flights to San Franciscofrom £354

Flights to Bostonfrom £325

Flights to Chicagofrom £347

Flights to Las Vegasfrom £413

Flights to Washington, D.C.from £331

Flights to Atlantafrom £354

Flights to Dallasfrom £351

Flights to Houstonfrom £354

Cheap flights from London to Illinois from £190

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 15/1. 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

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Find the cheapest flights from London to Illinois

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SWISS flights from London to Illinois

Our best SWISS deals on London to Illinois flight tickets

Icelandair flights from London to Illinois

Our best Icelandair 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?

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 17% 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, British Airways, and United Airlines 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 21 per day as of October 2025. The most frequent departure time is 14:00, with 59% 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 150 per week as of October 2025. The most frequent departure day is Thu, with 28% 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