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

Delta, KLM, and British Airways are the most popular carriers operating from London to Illinois

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

The number of flights available between London and Illinois is 50 per day as of September 2025. The most frequent departure time is 14:00, with 51% of daily flights leaving in the afternoon.

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 15 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 354 per week as of September 2025. The most frequent departure day is Sun, with 15% of weekly flights leaving on this day.

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 September 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.

£258 Cheap Flights from London to Illinois in 2025/26

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Find the cheapest flights from London to Illinois

Round-trip

One-way

Last minute

Direct

Cheap return flights

14:00 - 07:34LGW-ORD

23h 34m1 stop

18:58 - 10:00ORD-LGW

33h 02m1 stop

£394

Find Deal

Thu, 9 Oct - Wed, 15 Oct

08:20 - 15:45LHR-ORD

13h 25m1 stop

16:28 - 09:40ORD-LHR

11h 12m1 stop

£394American Airlines

Find Deal

Thu, 2 Oct - Wed, 8 Oct

12:15 - 17:20LHR-ORD

11h 05m1 stop

18:30 - 19:30ORD-LHR

19h 00m1 stop

£398Icelandair

Find Deal

Sun, 14 Dec - Thu, 15 Jan

12:35 - 15:25LHR-ORD

8h 50mdirect

21:45 - 11:35ORD-LHR

7h 50mdirect

£399British Airways

Find Deal

Fri, 7 Nov - Mon, 10 Nov

15:45 - 18:45LHR-ORD

9h 00mdirect

20:45 - 10:25ORD-LHR

7h 40mdirect

£400British Airways

Find Deal

Sat, 22 Nov - Fri, 5 Dec

15:40 - 21:15LGW-ORD

11h 35m1 stop

19:25 - 14:40ORD-LGW

13h 15m1 stop

£405Icelandair

Find Deal

Wed, 15 Oct - Sun, 19 Oct

09:45 - 16:13LHR-ORD

12h 28m1 stop

15:10 - 07:50ORD-LHR

10h 40m1 stop

£405Finnair

Find Deal

Thu, 9 Oct - Wed, 15 Oct

17:00 - 07:25LHR-ORD

20h 25m2 stops

09:41 - 06:20ORD-LHR

14h 39m1 stop

£415Finnair

Find Deal

Sun, 5 Oct - Sun, 12 Oct

09:40 - 21:05LCY-ORD

16h 25m1 stop

22:35 - 16:40ORD-LCY

12h 05m1 stop

£416Lufthansa

Find Deal

Thu, 30 Oct - Thu, 6 Nov

09:50 - 20:05LCY-ORD

16h 15m1 stop

22:35 - 16:40ORD-LCY

12h 05m1 stop

£417Lufthansa

Find Deal

Mon, 24 Nov - Sun, 30 Nov

American Airlines flights from London to Illinois

Our best American Airlines deals on London to Illinois flight tickets

American Airlines

2 Oct

LHR08:20London Heathrow

13h 25m

1 stop

ORD15:45Chicago O'Hare Intl

8 Oct

ORD16:28Chicago O'Hare Intl

11h 12m

1 stop

LHR09:40London Heathrow

£394

Find similar

American Airlines

3 Oct

LHR07:40London Heathrow

14h 05m

1 stop

ORD15:45Chicago O'Hare Intl

7 Oct

ORD14:41Chicago O'Hare Intl

11h 24m

1 stop

LHR08:05London Heathrow

£394

Find similar

American Airlines

1 Oct

LGW12:20London Gatwick

16h 52m

2 stops

ORD23:12Chicago O'Hare Intl

6 Oct

ORD13:43Chicago O'Hare Intl

12h 27m

1 stop

LGW08:10London Gatwick

£397

Find similar

Lufthansa flights from London to Illinois

Our best Lufthansa deals on London to Illinois flight tickets

Lufthansa

23 Sept

LHR07:30London Heathrow

16h 51m

2 stops

ORD18:21Chicago O'Hare Intl

30 Sept

ORD22:30Chicago O'Hare Intl

12h 10m

1 stop

LHR16:40London Heathrow

£402

Find similar

Lufthansa

30 Oct

LCY09:40London City

16h 25m

1 stop

ORD21:05Chicago O'Hare Intl

6 Nov

ORD22:35Chicago O'Hare Intl

12h 05m

1 stop

LCY16:40London City

£416

Find similar

Lufthansa

24 Nov

LCY09:50London City

16h 15m

1 stop

ORD20:05Chicago O'Hare Intl

30 Nov

ORD22:35Chicago O'Hare Intl

12h 05m

1 stop

LCY16:40London City

£417

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 9/10

14:00-07:34

1 stop23h 34m

Chicago O'Hare Intl

Wed 15/10

18:58-10:00

1 stop33h 02m

£394

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 2/10

08:20-15:45

1 stop13h 25m

Chicago O'Hare Intl

Wed 8/10

16:28-09:40

1 stop11h 12m

£394

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 14/12

12:15-17:20

1 stop11h 05m

Chicago O'Hare Intl

Thu 15/1

18:30-19:30

1 stop19h 00m

£398

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 7/11

12:35-15:25

Nonstop8h 50m

Chicago O'Hare Intl

Mon 10/11

21:45-11:35

Nonstop7h 50m

£399

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 22/11

15:45-18:45

Nonstop9h 00m

Chicago O'Hare Intl

Fri 5/12

20:45-10:25

Nonstop7h 40m

£400

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 15/10

15:40-21:15

1 stop11h 35m

Chicago O'Hare Intl

Sun 19/10

19:25-14:40

1 stop13h 15m

£405

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 9/10

09:45-16:13

1 stop12h 28m

Chicago O'Hare Intl

Wed 15/10

15:10-07:50

1 stop10h 40m

£405

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 5/10

17:00-07:25

2 stops20h 25m

Chicago O'Hare Intl

Sun 12/10

09:41-06:20

1 stop14h 39m

£415

LondonChicago

LCY - ORD

LCYORD

London City

Thu 30/10

09:40-21:05

1 stop16h 25m

Chicago O'Hare Intl

Thu 6/11

22:35-16:40

1 stop12h 05m

£416

LondonChicago

LCY - ORD

LCYORD

London City

Mon 24/11

09:50-20:05

1 stop16h 15m

Chicago O'Hare Intl

Sun 30/11

22:35-16:40

1 stop12h 05m

£417

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 £426. 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 £436.

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 £599. 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 £655. 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 £550. In the afternoon is when there is more demand to fly to Illinois, so prices are often more expensive at around £658 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 £532 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 £510 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 7% 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	£491
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 £491. The best return flight deal from London to Illinois found on momondo in the last 72 hours is £494.

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 September 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 44.77% of all bookings. The subsequent popular models are Boeing 777 at 13.01%, Boeing 787-10 Dreamliner at 12.41%, and Boeing 787-9 Dreamliner at 6.91%.

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 £308	Free Cancellation	Rating 7.0 544 reviews	Search Icelandair flights
Scandinavian Airlines	PriceFrom £350	Free Cancellation	Rating 7.4 1,484 reviews	Search Scandinavian Airlines flights
TAP AIR PORTUGAL	PriceFrom £364	Free Cancellation	Rating 7.1 1,975 reviews	Search TAP AIR PORTUGAL flights
Aer Lingus	PriceFrom £364	Free Cancellation	Rating 7.2 1,270 reviews	Search Aer Lingus flights
Virgin Atlantic	PriceFrom £376	Free Cancellation	Rating 7.4 664 reviews	Search Virgin Atlantic flights
Brussels Airlines	PriceFrom £389	Free Cancellation	Rating 7.2 359 reviews	Search Brussels Airlines flights
Lufthansa	PriceFrom £391	Free Cancellation	Rating 6.8 7,407 reviews	Search Lufthansa flights
Austrian Airlines	PriceFrom £397	Free Cancellation	Rating 7.6 850 reviews	Search Austrian Airlines flights
British Airways	PriceFrom £400	Free Cancellation	Rating 6.6 7,361 reviews	Search British Airways flights
United Airlines	PriceFrom £404	Free Cancellation	Rating 7.4 8,929 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 £257

Flights to Orlandofrom £269

Flights to Los Angelesfrom £293

Flights to Miamifrom £289

Flights to San Franciscofrom £312

Flights to Bostonfrom £291

Flights to Las Vegasfrom £379

Flights to Chicagofrom £316

Flights to Washington, D.C.from £316

Flights to Atlantafrom £361

Flights to Dallasfrom £352

Flights to Houstonfrom £392

Cheap flights from London to Illinois from £258

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 30/10. 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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Price Alerts

Find the cheapest flights from London to Illinois

Cheap return flights

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Cheap last-minute flights

Cheap direct flights

American Airlines flights from London to Illinois

Our best American Airlines deals on London to Illinois flight tickets

Lufthansa flights from London to Illinois

Our best Lufthansa 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 7% on your flight if you consider stops on a London to Illinois flight.

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

Delta, KLM, and British Airways 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 50 per day as of September 2025. The most frequent departure time is 14:00, with 51% 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 354 per week as of September 2025. The most frequent departure day is Sun, 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, 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