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

The number of flights available between London and Illinois is 31 per day as of February 2026. The most frequent departure time is 11:00, with 58% 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 219 per week as of February 2026. The most frequent departure day is Fri, with 17% of weekly flights leaving on this day.

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

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

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 67% 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.

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 February 2026, 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.

£278 Cheap Flights from London to Illinois in 2026

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Find the cheapest flights from London to Illinois

Round-trip

One-way

Last minute

Direct

Cheap return flights

Enter your travel dates to find the best prices.

07:05 - 16:45

LHR

ORD

15h 40m

2 stops

19:20 - 16:25

ORD

LHR

15h 05m

2 stops

£387Scandinavian Airlines

Thu, 26 Feb - Mon, 2 Mar

14:00 - 09:06

LGW

ORD

25h 06m

1 stop

18:51 - 06:00

ORD

LGW

29h 09m

1 stop

£388Multiple Airlines

Thu, 5 Mar - Sat, 7 Mar

12:15 - 18:20

LHR

ORD

11h 05m

1 stop

19:30 - 10:50

ORD

LHR

10h 20m

1 stop

£388Icelandair

Wed, 11 Mar - Wed, 25 Mar

13:00 - 18:15

LGW

ORD

11h 15m

1 stop

19:25 - 11:45

ORD

LGW

10h 20m

1 stop

£391Icelandair

Sun, 3 May - Sat, 9 May

11:30 - 23:36

LHR

STL

18h 06m

2 stops

13:39 - 10:15

STL

LHR

15h 36m

2 stops

£497Virgin Atlantic

Mon, 2 Mar - Mon, 16 Mar

11:30 - 23:36

LHR

STL

18h 06m

2 stops

18:59 - 09:00

STL

LHR

33h 01m

1 stop

£499Virgin Atlantic

Mon, 2 Mar - Mon, 16 Mar

09:55 - 18:52

LHR

STL

13h 57m

1 stop

14:06 - 07:20

STL

LHR

12h 14m

1 stop

£529British Airways

Tue, 17 Mar - Tue, 24 Mar

09:55 - 18:07

LHR

STL

13h 12m

1 stop

10:33 - 07:00

STL

LHR

15h 27m

2 stops

£536Finnair

Wed, 18 Mar - Wed, 25 Mar

15:35 - 11:29

LHR

STL

24h 54m

2 stops

18:37 - 10:25

STL

LHR

10h 48m

1 stop

£537Finnair

Tue, 17 Mar - Tue, 24 Mar

09:55 - 19:30

LHR

STL

14h 35m

1 stop

16:13 - 10:00

STL

LHR

12h 47m

1 stop

£551British Airways

Wed, 18 Mar - Wed, 25 Mar

Scandinavian Airlines flights from London to Illinois

Our best Scandinavian Airlines deals on London to Illinois flight tickets

Scandinavian Airlines

26 Feb

LHR07:05London Heathrow

15h 40m

2 stops

ORD16:45Chicago O'Hare Intl

2 Mar

ORD19:20Chicago O'Hare Intl

15h 05m

2 stops

LHR16:25London Heathrow

£387

Scandinavian Airlines

2 Mar

LHR10:20London Heathrow

12h 25m

1 stop

ORD16:45Chicago O'Hare Intl

16 Mar

ORD20:20Chicago O'Hare Intl

14h 40m

1 stop

LHR16:00London Heathrow

£388

Scandinavian Airlines

26 Feb

LHR06:40London Heathrow

16h 05m

1 stop

ORD16:45Chicago O'Hare Intl

2 Mar

ORD19:20Chicago O'Hare Intl

17h 30m

2 stops

LHR18:50London Heathrow

£389

Icelandair flights from London to Illinois

Our best Icelandair deals on London to Illinois flight tickets

Icelandair

11 Mar

LHR12:15London Heathrow

11h 05m

1 stop

ORD18:20Chicago O'Hare Intl

25 Mar

ORD19:30Chicago O'Hare Intl

10h 20m

1 stop

LHR10:50London Heathrow

£388

Icelandair

3 May

LGW13:00London Gatwick

11h 15m

1 stop

ORD18:15Chicago O'Hare Intl

9 May

ORD19:25Chicago O'Hare Intl

10h 20m

1 stop

LGW11:45London Gatwick

£391

Icelandair

23 Feb

LGW11:55London Gatwick

11h 25m

1 stop

ORD17:20Chicago O'Hare Intl

27 Feb

ORD18:30Chicago O'Hare Intl

10h 25m

1 stop

LGW10:55London Gatwick

£391

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 26/2

07:05-16:45

2 stops15h 40m

Chicago O'Hare Intl

Mon 2/3

19:20-16:25

2 stops15h 05m

£387

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 5/3

14:00-09:06

1 stop25h 06m

Chicago O'Hare Intl

Sat 7/3

18:51-06:00

1 stop29h 09m

£388

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 11/3

12:15-18:20

1 stop11h 05m

Chicago O'Hare Intl

Wed 25/3

19:30-10:50

1 stop10h 20m

£388

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sun 3/5

13:00-18:15

1 stop11h 15m

Chicago O'Hare Intl

Sat 9/5

19:25-11:45

1 stop10h 20m

£391

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/3

11:30-23:36

2 stops18h 06m

Lambert-St Louis

Mon 16/3

13:39-10:15

2 stops15h 36m

£497

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/3

11:30-23:36

2 stops18h 06m

Lambert-St Louis

Mon 16/3

18:59-09:00

1 stop33h 01m

£499

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 17/3

09:55-18:52

1 stop13h 57m

Lambert-St Louis

Tue 24/3

14:06-07:20

1 stop12h 14m

£529

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 18/3

09:55-18:07

1 stop13h 12m

Lambert-St Louis

Wed 25/3

10:33-07:00

2 stops15h 27m

£536

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 17/3

15:35-11:29

2 stops24h 54m

Lambert-St Louis

Tue 24/3

18:37-10:25

1 stop10h 48m

£537

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 18/3

09:55-19:30

1 stop14h 35m

Lambert-St Louis

Wed 25/3

16:13-10:00

1 stop12h 47m

£551

Flights are sorted by cheapest return 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 month of February is, on average, the cheapest month to fly to Illinois from London, with most prices found around £422. If you aren’t able to travel to Illinois during the month of February, then flying in November is also cheap. Prices for this month can be found on momondo for an average of £424.

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 £608. 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 £647. 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 at midday. Our users have found flights to Illinois at midday for as low as £622. In the afternoon is when there is more demand to fly to Illinois, so prices are often more expensive at around £657 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 £530 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 £506 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.

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	£415
Fastest flight time	8h 40m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from London in the past 72 hours is £415. The best return flight deal from London to Illinois found on momondo in the last 72 hours is £481.

The fastest flight from London to Illinois takes 8h 40m

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 February 2026, 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 25.96% of all bookings. The subsequent popular models are Boeing 787-9 Dreamliner at 24.28%, Boeing 777 at 13.57%, and Boeing 787-10 Dreamliner at 10.61%.

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 £332	Free Cancellation	Rating 7.1 606 reviews	Search Icelandair flights
Virgin Atlantic	PriceFrom £338	Free Cancellation	Rating 7.5 678 reviews	Search Virgin Atlantic flights
Scandinavian Airlines	PriceFrom £352	Free Cancellation	Rating 7.3 1,676 reviews	Search Scandinavian Airlines flights
Aer Lingus	PriceFrom £357	Free Cancellation	Rating 7.2 1,444 reviews	Search Aer Lingus flights
TAP AIR PORTUGAL	PriceFrom £375	Free Cancellation	Rating 7.1 2,132 reviews	Search TAP AIR PORTUGAL flights
Brussels Airlines	PriceFrom £378	Free Cancellation	Rating 7.2 381 reviews	Search Brussels Airlines flights
Lufthansa	PriceFrom £387	Free Cancellation	Rating 6.8 7,758 reviews	Search Lufthansa flights
Austrian Airlines	PriceFrom £393	Free Cancellation	Rating 7.5 896 reviews	Search Austrian Airlines flights
British Airways	PriceFrom £394	Free Cancellation	Rating 6.7 7,709 reviews	Search British Airways flights
United Airlines	PriceFrom £401	Free Cancellation	Rating 7.4 9,229 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.