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

WestJet and TAP AIR PORTUGAL are the most popular carriers operating from Illinois to London

How long does it take to fly to London?

Flight times from Illinois to London vary, but if you’re flying out of Chicago and flying into London Heathrow Airport (one of the most popular routes), then the duration is 8h 31m on average. Another popular route from Illinois to London is flying from Moline to London Heathrow Airport, which will take roughly 11h. Keep in mind that layovers or delays could extend your travel time.

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

As of September 2025, 56 flights take off from Illinois and land in London each day. The most common flight departure time for this route is 16:00, with 64% of daily flights taking off in the evening.

Which airlines fly to London?

British Airways, Iberia and Finnair are the top three most popular airlines that fly to London from Illinois according to our data. British Airways is the first choice among our users, with 53% of people opting to fly with this airline when travelling to London. Keep in mind that there are 7 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

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

As of September 2025, 394 flights take off from Illinois and land in London each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.

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

Prices for flights from Illinois to London refresh daily.

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

As of September 2025, there are 10 operators available to choose from for flights from Illinois to London.

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

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 Illinois to London.

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

The travel and health documents required for your trip to London can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

£169 Cheap Flights from Illinois to London in 2025/26

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Find the cheapest flights from Illinois to London

Round-trip

One-way

Last minute

Direct

Cheap return flights

12:50 - 07:10ORD-LHR

12h 20m1 stop

09:00 - 18:52LHR-ORD

15h 52m2 stops

£372Multiple Airlines

Find Deal

Mon, 1 Dec - Tue, 9 Dec

18:00 - 08:20ORD-LHR

8h 20mdirect

06:50 - 13:10LHR-ORD

11h 20m1 stop

£373United Airlines

Find Deal

Tue, 21 Oct - Fri, 31 Oct

17:40 - 07:20ORD-LHR

7h 40mdirect

20:00 - 14:15LHR-ORD

24h 15m1 stop

£374Iberia

Find Deal

Tue, 30 Sep - Mon, 6 Oct

13:59 - 06:20ORD-LHR

10h 21m1 stop

20:00 - 14:15LHR-ORD

24h 15m1 stop

£377Iberia

Find Deal

Wed, 1 Oct - Mon, 6 Oct

21:45 - 11:35ORD-LHR

7h 50mdirect

12:35 - 15:25LHR-ORD

8h 50mdirect

£377British Airways

Find Deal

Wed, 12 Nov - Wed, 19 Nov

22:15 - 14:40ORD-LGW

10h 25m1 stop

15:40 - 18:15LGW-ORD

32h 35m1 stop

£377Icelandair

Find Deal

Wed, 15 Oct - Mon, 20 Oct

19:50 - 17:50ORD-LGW

17h 00m1 stop

18:40 - 16:20LGW-ORD

27h 40m1 stop

£378SWISS

Find Deal

Wed, 29 Oct - Mon, 3 Nov

19:50 - 17:50ORD-LGW

17h 00m1 stop

18:40 - 16:20LGW-ORD

27h 40m1 stop

£379SWISS

Find Deal

Wed, 29 Oct - Mon, 3 Nov

16:55 - 06:50ORD-LHR

7h 55mdirect

11:00 - 13:50LHR-ORD

8h 50mdirect

£381British Airways

Find Deal

Wed, 22 Oct - Fri, 5 Dec

19:25 - 14:40ORD-LGW

13h 15m1 stop

11:55 - 17:20LGW-ORD

11h 25m1 stop

£382Icelandair

Find Deal

Sun, 19 Oct - Wed, 3 Dec

United Airlines flights from Illinois to London

Our best United Airlines deals on Illinois to London flight tickets

United Airlines

21 Oct

ORD18:00Chicago O'Hare Intl

8h 20m

LHR08:20London Heathrow

31 Oct

LHR06:50London Heathrow

11h 20m

1 stop

ORD13:10Chicago O'Hare Intl

£373

Find similar

United Airlines

2 Nov

ORD21:30Chicago O'Hare Intl

30h 10m

1 stop

LHR09:40London Heathrow

20 Nov

LHR13:25London Heathrow

27h 53m

1 stop

ORD11:18Chicago O'Hare Intl

£376

Find similar

United Airlines

22 Oct

ORD14:08Chicago O'Hare Intl

10h 22m

1 stop

LHR06:30London Heathrow

27 Oct

LHR11:10London Heathrow

33h 00m

1 stop

ORD15:10Chicago O'Hare Intl

£378

Find similar

Iberia flights from Illinois to London

Our best Iberia deals on Illinois to London flight tickets

Iberia

30 Sept

ORD17:40Chicago O'Hare Intl

7h 40m

LHR07:20London Heathrow

6 Oct

LHR20:00London Heathrow

24h 15m

1 stop

ORD14:15Chicago O'Hare Intl

£374

Find similar

Iberia

1 Oct

ORD13:59Chicago O'Hare Intl

10h 21m

1 stop

LHR06:20London Heathrow

6 Oct

LHR20:00London Heathrow

24h 15m

1 stop

ORD14:15Chicago O'Hare Intl

£377

Find similar

Iberia

1 Oct

ORD13:59Chicago O'Hare Intl

10h 21m

1 stop

LHR06:20London Heathrow

8 Oct

LHR20:00London Heathrow

24h 15m

1 stop

ORD14:15Chicago O'Hare Intl

£377

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 1/12

12:50-07:10

1 stop12h 20m

London Heathrow

Tue 9/12

09:00-18:52

2 stops15h 52m

£372

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 21/10

18:00-08:20

Nonstop8h 20m

London Heathrow

Fri 31/10

06:50-13:10

1 stop11h 20m

£373

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 30/9

17:40-07:20

Nonstop7h 40m

London Heathrow

Mon 6/10

20:00-14:15

1 stop24h 15m

£374

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 1/10

13:59-06:20

1 stop10h 21m

London Heathrow

Mon 6/10

20:00-14:15

1 stop24h 15m

£377

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 12/11

21:45-11:35

Nonstop7h 50m

London Heathrow

Wed 19/11

12:35-15:25

Nonstop8h 50m

£377

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Wed 15/10

22:15-14:40

1 stop10h 25m

London Gatwick

Mon 20/10

15:40-18:15

1 stop32h 35m

£377

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Wed 29/10

19:50-17:50

1 stop17h 00m

London Gatwick

Mon 3/11

18:40-16:20

1 stop27h 40m

£378

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Wed 29/10

19:50-17:50

1 stop17h 00m

London Gatwick

Mon 3/11

18:40-16:20

1 stop27h 40m

£379

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 22/10

16:55-06:50

Nonstop7h 55m

London Heathrow

Fri 5/12

11:00-13:50

Nonstop8h 50m

£381

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 19/10

19:25-14:40

1 stop13h 15m

London Gatwick

Wed 3/12

11:55-17:20

1 stop11h 25m

£382

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How to get the cheapest flight ticket from Illinois to London

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 London?

The cheapest month to fly to London from Illinois is in February. Flight prices, which tend to average around £478, are often lower during this time because this is during the off-season. The month of September is another great option to travel to London, with average flight prices from Illinois averaging around £485.

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

Our data shows that Thursday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £509. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to London for around £649.

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

The cheapest time of day to fly to London is in the morning when flights can be purchased for as low as £482. Flights at midday are often more expensive, with an average ticket price of £805.

What is the cheapest Illinois to London flight route?

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

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

You are more likely to see cheaper flights to London from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around £583 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Illinois for as low as £511 on momondo.

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

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

You could potentially save up to 36% on your flight if you consider stops on a Illinois to London flight.

Cheap Illinois to London flight deals and tips

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

Best price found	£275
Fastest flight time	7h 40m
Direct flights	Every day
Airports in London	1 airport

The best one-way flight to London from Illinois in the past 72 hours is £275. The best return flight deal from Illinois to London found on momondo in the last 72 hours is £440.

The fastest flight from Illinois to London takes 7h 40m

Direct flights go from Illinois to London every day.

There is 1 airport near London: London Heathrow (LHR)

Search flight deals

When did momondo last update prices for flights from Illinois to London?
Prices for flights from Illinois to London refresh daily.
How many operators does momondo search for flights from Illinois to London?
As of September 2025, there are 10 operators available to choose from for flights from Illinois to London.
How old do you have to be to fly from Illinois to London?
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 Illinois to London.
What documentation or ID do you need to fly to London?
The travel and health documents required for your trip to London can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Illinois to London?
Based on momondo bookings for flights between Illinois and London, the leading plane model is Boeing 787-9 Dreamliner, making up 40.62% of the total bookings. Other popular models include Boeing 787-10 Dreamliner with 19.41%, Boeing 777 with 16.58%, and Boeing 767-300 with 14.74%.

Best airlines flying from Illinois to London

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

Airline	Rating	Free Cancellation	Price
Lufthansa	PriceFrom £354	Free Cancellation	Rating 6.8 7,415 reviews	Search Lufthansa flights
American Airlines	PriceFrom £381	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Finnair	PriceFrom £409	Free Cancellation	Rating 7.6 1,324 reviews	Search Finnair flights
Iberia	PriceFrom £441	Free Cancellation	Rating 7.0 2,926 reviews	Search Iberia flights
Aer Lingus	PriceFrom £444	Free Cancellation	Rating 7.2 1,281 reviews	Search Aer Lingus flights
British Airways	PriceFrom £454	Free Cancellation	Rating 6.7 7,373 reviews	Search British Airways flights
United Airlines	PriceFrom £457	Free Cancellation	Rating 7.4 8,926 reviews	Search United Airlines flights

Eastbourne

Luton

Milton Keynes

Maidstone

Gatwick

Slough

Canterbury

Southend-on-Sea

Ipswich

Ilford

Guildford

Colchester

Worthing

Chelmsford

Dover

Hayes

Dartford

Winchester

Hounslow

Stansted

Why use momondo?

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

It is quick and easy to find Illinois to London 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 London that suits you.

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

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

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

Once you have performed a search for Illinois to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Yes momondo offers price alerts on flights to London from Illinois. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your London 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 the United Kingdom

Fly into one of these airports located in London

London City Airport

London Gatwick Airport

London Heathrow Airport

London Luton Airport

London Southend Airport

London Stansted Airport

Popular Cities in the United Kingdom

Flights to Manchesterfrom £30

Flights to Birminghamfrom £33

Flights to Edinburghfrom £29

Flights to Belfastfrom £29

Flights to Glasgowfrom £32

Flights to Bristolfrom £30

Flights to Newcastle upon Tynefrom £52

Flights to Aberdeenfrom £49

Flights to Liverpoolfrom £30

Flights to Leedsfrom £36

Flights to Invernessfrom £38

Flights to Newquayfrom £35

Cheap flights from Illinois to London from £169

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to London departing on 4/10. 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

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Filter for what you want

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Find the cheapest flights from Illinois to London

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United Airlines flights from Illinois to London

Our best United Airlines deals on Illinois to London flight tickets

Iberia flights from Illinois to London

Our best Iberia deals on Illinois to London flight tickets

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

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How to get the cheapest flight ticket from Illinois to London

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 London?

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

Our data shows that Thursday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £509. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to London for around £649.

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

The cheapest time of day to fly to London is in the morning when flights can be purchased for as low as £482. Flights at midday are often more expensive, with an average ticket price of £805.

What is the cheapest Illinois to London flight route?

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

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

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

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

You could potentially save up to 36% on your flight if you consider stops on a Illinois to London flight.

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

WestJet and TAP AIR PORTUGAL are the most popular carriers operating from Illinois to London

Which airlines fly to London?

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

As of September 2025, 56 flights take off from Illinois and land in London each day. The most common flight departure time for this route is 16:00, with 64% of daily flights taking off in the evening.

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

As of September 2025, 394 flights take off from Illinois and land in London each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.

How long does it take to fly to London?

Cheap Illinois to London flight deals and tips

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

Best price found

Fastest flight time

Direct flights

Airports in London

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

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

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

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

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

Best airlines flying from Illinois to London

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

Travelling to a place near London?

Why use momondo?

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

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

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

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

An easier way to manage your London 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 the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London