How long is the flight from Illinois to London?

For as low as $507, Icelandair can have you in London from Illinois in 10h 25m. The distance between Illinois and London is about 3960 mi. Both multi-stop and nonstop flights can be found to your destination and back.

In terms of precipitation, rainfall in London ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London when rainfall is around 1.6 in.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

What are the most popular routes from Illinois to London?

While some choose either Chicago O'Hare Intl - London Gatwick or Chicago O'Hare Intl - London City, Chicago O'Hare Intl - London Heathrow is the most popular route from Illinois to London.

What are the cheapest flights from Illinois to London?

On average you can expect to pay $2,504 for a flight from Illinois to London. The cheapest flight overall is $372 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at $371.

What are the most reliable airlines from Illinois to London?

No one likes to see their flight delayed. When booking a flight from Illinois to London consider choosing Air Canada (63%), Austrian Airlines (63%) or United Airlines (63%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from Illinois to London?

When booking a flight from Illinois to London, you may want to consider flying on American Airlines, Air Canada or Alaska Airlines as they are the most popular for this route.

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

Find a great deal and save up to 11% by booking at least 60 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Illinois to London within the next two weeks, with the cheapest ticket starting at $701.

What is the cheapest month to fly from Illinois to London?

Our data shows that February tends to be the cheapest month to fly to London from Illinois. Users have commonly found prices around $762 for the month, but tickets can be as low as $463. Due to multiple factors, prepare for potentially higher prices in June.

Can I find deals for flights from Illinois to London that include hotel bookings?

Yes. In addition to deals on Illinois to London flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Illinois to London?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to London.

Can I find deals for business class flights from Illinois to London?

Yes. Cheapflights offers flight deals from Illinois to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$222+ Cheap Flights from Illinois to London

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Cheap flight deals from Illinois to London

Round-trip from	$505 (FlightHub)
One-way from	$222 (Kiwi.com)
Popular in	June
Cheapest in	February
Average price	$713
Good round-trip deal	$572 or less
Good one-way deal	$388 or less

From Illinois to London (LON)

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One-way flight from Illinois to London (LON)

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Highest demand for flights based on searches. 21% potential increase in price ($203 potential increase over avg. RT price).

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Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).

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Average for round-trip flights in August 2025

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Price to beat on a round-trip flight from Illinois to London (LON).

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Price to beat on a one-way flight from Illinois to London (LON).

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Find flight deals from Illinois to London

Cheapest flights from Illinois to London
Explore the most affordable flight options available from Illinois to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

Mon 9/87:25 pmORD - LGW

1 stop10h 20mIcelandair

Fri 9/123:40 pmLGW - ORD

1 stop11h 35mIcelandair

Deal found 8/18

$505

Mon 9/227:25 pmORD - LHR

1 stop18h 55mIcelandair

Tue 9/309:25 pmLHR - ORD

1 stop26h 50mIcelandair

Deal found 8/17

$506

Fri 9/57:25 pmORD - LGW

1 stop13h 15mIcelandair

Fri 9/123:40 pmLGW - ORD

1 stop11h 35mIcelandair

Deal found 8/16

$506

Fri 9/57:25 pmORD - LHR

1 stop10h 30mIcelandair

Thu 9/119:25 pmLHR - ORD

1 stop29h 50mIcelandair

Deal found 8/16

$507

Wed 12/36:30 pmORD - LTN

1 stop13h 00mMultiple Airlines

Sun 12/76:00 amLTN - ORD

1 stop17h 20mMultiple Airlines

Deal found 8/16

$507

Fri 9/510:15 pmORD - LGW

1 stop10h 25mIcelandair

Thu 9/113:40 pmLGW - ORD

1 stop11h 35mIcelandair

Deal found 8/17

$507

Mon 9/110:15 pmORD - LHR

1 stop16h 05mIcelandair

Tue 9/99:25 pmLHR - ORD

1 stop26h 50mIcelandair

Deal found 8/16

$508

Mon 12/16:30 pmORD - LTN

1 stop13h 30mMultiple Airlines

Sun 12/146:00 amLTN - ORD

1 stop17h 20mMultiple Airlines

Deal found 8/18

$509

Wed 9/37:25 pmORD - LGW

1 stop10h 20mIcelandair

Thu 9/113:40 pmLGW - ORD

1 stop11h 35mIcelandair

Deal found 8/17

$509

Thu 10/308:50 pmORD - STN

3 stops21h 30mMultiple Airlines

Fri 11/71:30 pmSTN - ORD

3 stops33h 15mMultiple Airlines

Deal found 8/15

$509

Fri 10/105:50 amORD - LGW

2 stops22h 10mMultiple Airlines

Tue 10/142:00 pmLGW - ORD

1 stop31h 08mMultiple Airlines

Deal found 8/16

$510

Thu 9/47:25 pmORD - LHR

1 stop10h 30mIcelandair

Tue 9/99:25 pmLHR - ORD

1 stop26h 50mIcelandair

Deal found 8/17

$511

Best flights from Illinois to London
Discover carefully curated flight deals from Illinois to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 18, 2025.

Wed 12/36:30 pmORD - LTN

1 stop13h 00mMultiple Airlines

Sun 12/76:00 amLTN - ORD

1 stop17h 20mMultiple Airlines

Deal found 8/16

$507

Fri 9/510:15 pmORD - LGW

1 stop10h 25mIcelandair

Thu 9/113:40 pmLGW - ORD

1 stop11h 35mIcelandair

Deal found 8/17

$507

Fri 11/73:59 pmSTL - LHR

2 stops18h 01mScandinavian Airlines

Sun 11/96:40 amLHR - STL

3 stops22h 59mScandinavian Airlines

Deal found 8/18

$635

Wed 9/107:05 pmORD - LCY

1 stop11h 25mSWISS

Wed 9/179:25 amLCY - ORD

1 stop12h 30mSWISS

Deal found 8/18

$655

Sun 9/214:05 pmSTL - LHR

1 stop11h 55mAir Canada

Tue 10/72:05 pmLHR - STL

1 stop11h 52mAir Canada

Deal found 8/16

$709

Wed 11/510:40 amMDW - LHR

1 stop15h 10mDelta

Wed 11/126:20 amLHR - MDW

2 stops17h 47mDelta

Deal found 8/16

$753

Wed 11/129:20 amMDW - LHR

1 stop15h 45mVirgin Atlantic

Wed 11/196:20 amLHR - MDW

2 stops18h 16mVirgin Atlantic

Deal found 8/16

$753

Wed 11/123:50 pmSTL - LCY

1 stop11h 15mLufthansa

Tue 11/185:15 pmLCY - STL

1 stop26h 40mLufthansa

Deal found 8/17

$814

Fri 9/510:15 pmORD - LGW

1 stop10h 25mIcelandair

Fri 9/123:40 pmLGW - ORD

1 stop11h 35mIcelandair

Deal found 8/18

$507

Tue 12/26:30 pmORD - LTN

1 stop13h 55mMultiple Airlines

Sun 12/76:00 amLTN - ORD

1 stop17h 20mMultiple Airlines

Deal found 8/17

$509

Thu 10/308:50 pmORD - STN

3 stops21h 30mMultiple Airlines

Fri 11/71:30 pmSTN - ORD

3 stops33h 15mMultiple Airlines

Deal found 8/15

$509

Thu 9/410:15 pmORD - LGW

1 stop31h 30mIcelandair

Thu 9/113:40 pmLGW - ORD

1 stop11h 35mIcelandair

Deal found 8/17

$511

Last-minute flights from Illinois to London
Discover last-minute flight deals from Illinois to London. Data last updated August 18, 2025 and is based on user searches.

Mon 9/110:15 pmORD - LHR

1 stop16h 05mIcelandair

Tue 9/99:25 pmLHR - ORD

1 stop26h 50mIcelandair

Deal found 8/16

$508

Mon 9/110:15 pmORD - LHR

1 stop16h 05mIcelandair

Mon 9/89:25 pmLHR - ORD

1 stop26h 50mIcelandair

Deal found 8/17

$513

Wed 9/37:25 pmORD - LGW

1 stop10h 20mIcelandair

Thu 9/113:40 pmLGW - ORD

1 stop11h 35mIcelandair

Deal found 8/17

$509

Thu 9/47:25 pmORD - LHR

1 stop10h 30mIcelandair

Tue 9/99:25 pmLHR - ORD

1 stop26h 50mIcelandair

Deal found 8/17

$511

Thu 9/410:15 pmORD - LGW

1 stop31h 30mIcelandair

Tue 9/91:00 pmLGW - ORD

1 stop11h 15mIcelandair

Deal found 8/17

$511

Fri 9/57:25 pmORD - LGW

1 stop13h 15mIcelandair

Fri 9/123:40 pmLGW - ORD

1 stop11h 35mIcelandair

Deal found 8/16

$506

Fri 9/57:25 pmORD - LHR

1 stop10h 30mIcelandair

Thu 9/119:25 pmLHR - ORD

1 stop29h 50mIcelandair

Deal found 8/16

$507

Fri 9/510:15 pmORD - LGW

1 stop10h 25mIcelandair

Thu 9/113:40 pmLGW - ORD

1 stop11h 35mIcelandair

Deal found 8/17

$507

Sat 9/67:25 pmORD - LHR

1 stop10h 30mIcelandair

Sat 9/139:25 pmLHR - ORD

1 stop26h 50mIcelandair

Deal found 8/16

$515

Mon 9/87:25 pmORD - LGW

1 stop10h 20mIcelandair

Fri 9/123:40 pmLGW - ORD

1 stop11h 35mIcelandair

Deal found 8/18

$505

Wed 9/1010:15 pmORD - LHR

1 stop31h 40mIcelandair

Mon 9/159:25 pmLHR - ORD

1 stop26h 50mIcelandair

Deal found 8/16

$517

Mon 9/227:25 pmORD - LHR

1 stop18h 55mIcelandair

Tue 9/309:25 pmLHR - ORD

1 stop26h 50mIcelandair

Deal found 8/17

$506

One-way flights from Illinois to London
Search for one-way flight options from Illinois to London. Find affordable one-way fares based on user searches. Data last updated August 18, 2025.

Mon 10/206:05 pmSTL - LGW

1 stop33h 55mMultiple Airlines

Deal found 8/17

$222

Fri 11/288:15 pmORD - LHR

1 stop16h 40mTAP AIR PORTUGAL

Deal found 8/17

$226

Fri 11/288:15 pmORD - LGW

1 stop13h 30mTAP AIR PORTUGAL

Deal found 8/16

$226

Sun 9/286:00 pmORD - LHR

1 stop22h 55mTAP AIR PORTUGAL

Deal found 8/17

$227

Fri 10/106:00 pmORD - STN

2 stops23h 10mMultiple Airlines

Deal found 8/15

$227

Thu 9/256:00 pmORD - LHR

1 stop12h 45mTAP AIR PORTUGAL

Deal found 8/17

$228

Sun 11/168:25 pmORD - LGW

1 stop13h 20mTAP AIR PORTUGAL

Deal found 8/17

$228

Mon 11/172:20 pmORD - LHR

1 stop16h 30mWestJet

Deal found 8/17

$229

Thu 9/2510:27 amORD - LGW

1 stop14h 33mMultiple Airlines

Deal found 8/18

$229

Fri 10/36:00 pmORD - STN

2 stops21h 05mMultiple Airlines

Deal found 8/17

$229

Mon 12/12:20 pmORD - LHR

1 stop16h 30mWestJet

Deal found 8/17

$230

Sat 10/187:52 pmSTL - LGW

2 stops33h 03mMultiple Airlines

Deal found 8/17

$230

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Wed 12/3

6:30 pm-1:30 pm

1 stop13h 00m

London Luton

Sun 12/7

6:00 am-5:20 pm

1 stop17h 20m

$507

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Fri 9/5

10:15 pm-2:40 pm

1 stop10h 25m

London Gatwick

Thu 9/11

3:40 pm-9:15 pm

1 stop11h 35m

$507

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Fri 9/5

10:15 pm-2:40 pm

1 stop10h 25m

London Gatwick

Fri 9/12

3:40 pm-9:15 pm

1 stop11h 35m

$507

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Tue 12/2

6:30 pm-2:25 pm

1 stop13h 55m

London Luton

Sun 12/7

6:00 am-5:20 pm

1 stop17h 20m

$509

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Thu 10/30

8:50 pm-11:20 pm

3 stops21h 30m

London Stansted

Fri 11/7

1:30 pm-4:45 pm

3 stops33h 15m

$509

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Wed 11/12

7:10 pm-7:40 pm

2 stops18h 30m

London Stansted

Tue 11/18

8:25 pm-3:00 pm

2 stops24h 35m

$509

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Mon 12/1

6:30 pm-2:00 pm

1 stop13h 30m

London Luton

Sun 12/14

6:00 am-5:20 pm

1 stop17h 20m

$510

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Wed 11/12

6:30 pm-1:30 pm

1 stop13h 00m

London Luton

Wed 11/19

7:30 am-5:20 pm

1 stop15h 50m

$510

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Sun 11/30

6:30 pm-2:50 pm

1 stop14h 20m

London Luton

Sun 12/14

6:00 am-5:20 pm

1 stop17h 20m

$510

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Thu 9/4

10:15 pm-11:45 am

1 stop31h 30m

London Gatwick

Thu 9/11

3:40 pm-9:15 pm

1 stop11h 35m

$511

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/17

Showing 1-10 of 60 results

...

Best time to book a flight from Illinois to London

Have a flexible travel schedule? Discover the best time to fly to London from Illinois with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Illinois to London

What is the cheapest month to book a flight from Illinois to London?

Currently, November is the cheapest month in which you can book a flight from Illinois to London (average of $661). Flying from Illinois to London in June is currently the most expensive (average of $1,097). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IL to LON?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to London as you normally would.

Weekly flight availability from Illinois to London

The most flights from USIL to LON are scheduled on a Monday (57 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (51 on average).

Related info for your journey

How long is the flight from Illinois to London?
For as low as $507, Icelandair can have you in London from Illinois in 10h 25m. The distance between Illinois and London is about 3960 mi. Both multi-stop and nonstop flights can be found to your destination and back.
What are the most popular routes from Illinois to London?
While some choose either Chicago O'Hare Intl - London Gatwick or Chicago O'Hare Intl - London City, Chicago O'Hare Intl - London Heathrow is the most popular route from Illinois to London.
What are the most reliable airlines from Illinois to London?
No one likes to see their flight delayed. When booking a flight from Illinois to London consider choosing Air Canada (63%), Austrian Airlines (63%) or United Airlines (63%) as they are the most reliable in getting you off to your destination on time.
What are the cheapest flights from Illinois to London?
On average you can expect to pay $2,504 for a flight from Illinois to London. The cheapest flight overall is $372 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at $371.
Can I find deals for flights from Illinois to London that include hotel bookings?
Yes. In addition to deals on Illinois to London flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Illinois to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to London.
Can I find deals for business class flights from Illinois to London?
Yes. Cheapflights offers flight deals from Illinois to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Illinois to London?
Currently, November is the cheapest month in which you can book a flight from Illinois to London (average of $661). Flying from Illinois to London in June is currently the most expensive (average of $1,097). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Hounslow

Hayes

Thornton Heath

Harrow

Canterbury

Dartford

Dover

Orpington

Watford

Gatwick

Borehamwood

Aylesbury

Chelmsford

Southend-on-Sea

Folkestone

Chichester

Arundel

Eastbourne

Milton Keynes

Sutton

Browse thousands of different options on Cheapflights for your next trip

Top 10 airlines flying from Illinois to London

Airline	Cheapest	Average	Flexibility	On-time
JetBlue	Cheapest$51	Average$632	FlexibilityNo cancel fee	On-time62%
SWISS	Cheapest$257	Average$723	FlexibilityNo cancel fee	On-time79%
Scandinavian Airlines	Cheapest$338	Average$594	FlexibilityNo cancel fee	On-time77%
Delta	Cheapest$345	Average$909	FlexibilityNo cancel fee	On-timeN/A
Lufthansa	Cheapest$400	Average$915	FlexibilityNo cancel fee	On-time76%
Icelandair	Cheapest$468	Average$653	FlexibilityNo cancel fee	On-time76%
British Airways	Cheapest$502	Average$850	FlexibilityNo cancel fee	On-time70%
TAP AIR PORTUGAL	Cheapest$508	Average$797	FlexibilityNo cancel fee	On-timeN/A
Aer Lingus	Cheapest$548	Average$818	FlexibilityNo cancel fee	On-timeN/A
Finnair	Cheapest$562	Average$760	FlexibilityNo cancel fee	On-time76%

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$222+ Cheap flights from Illinois to London (LON)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/20. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Illinois to London with Cheapflights

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Cheap flight deals from Illinois to London

Keep the following information in mind while searching for Illinois to London flight deals. Data was last updated August 18, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Illinois to London

Cheapest flights from Illinois to LondonExplore the most affordable flight options available from Illinois to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

Explore the most affordable flight options available from Illinois to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Illinois to London

Have a flexible travel schedule? Discover the best time to fly to London from Illinois with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Illinois to London

What is the cheapest month to book a flight from Illinois to London?

What is the cheapest time of day to fly from IL to LON?

Find hourly flight availability from Illinois to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 18, 2025.

Weekly flight availability from Illinois to London

Explore weekly flight availability from Illinois to London. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated August 18, 2025.

Related info for your journey

Find useful and relevant information for your journey from Illinois to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

How long is the flight from Illinois to London?

What are the most popular routes from Illinois to London?

What are the most reliable airlines from Illinois to London?

What are the cheapest flights from Illinois to London?

Can I find deals for flights from Illinois to London that include hotel bookings?

How can I find direct flights from Illinois to London?

Can I find deals for business class flights from Illinois to London?

What is the cheapest month to book a flight from Illinois to London?

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Alternative routes for Illinois to London

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Top 10 airlines flying from Illinois to London

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Cheapest flights from Illinois to London
Explore the most affordable flight options available from Illinois to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.