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$230+ 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 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LON
oct. 16 — oct. 231
jue. 10/16
jue. 10/23
1 adult, Economy
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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 septiembre 16, 2025.

Round-trip from

$505
(Air Canada)

One-way from

$230
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$659

Good round-trip deal

$642 or less

Good one-way deal

$438 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 ($208 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($36 potential savings vs. average RT price).
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Average for round-trip flights in September 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 septiembre 16, 2025.

This Air Canada deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/193:35 pmORD - LHR
1 stop12h 00mMultiple Airlines
mar. 11/49:00 amLHR - ORD
2 stops15h 39mMultiple Airlines
Deal found 9/14$505
This Mytrip deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/16:30 pmORD - STN
2 stops13h 50mMultiple Airlines
dom. 12/146:30 amSTN - ORD
2 stops16h 50mMultiple Airlines
Deal found 9/15$505
This Booking.com deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/410:00 amORD - LHR
1 stop14h 30mMultiple Airlines
lun. 11/1012:05 pmLHR - ORD
1 stop34h 15mMultiple Airlines
Deal found 9/14$506
This Mytrip deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/56:30 pmORD - LGW
2 stops16h 50mMultiple Airlines
mar. 11/118:50 amLGW - ORD
2 stops14h 30mMultiple Airlines
Deal found 9/14$506
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/304:00 pmORD - LHR
Nonstop8h 20mUnited Airlines
mar. 10/76:50 amLHR - ORD
1 stop11h 15mUnited Airlines
Deal found 9/15$507
This Norse deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Norse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/67:51 pmORD - LGW
1 stop32h 09mMultiple Airlines
jue. 10/92:00 pmLGW - ORD
1 stop34h 46mMultiple Airlines
Deal found 9/15$507
This Mytrip deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/286:30 pmORD - STN
2 stops20h 05mMultiple Airlines
vie. 12/55:55 amSTN - ORD
2 stops17h 25mMultiple Airlines
Deal found 9/14$507
This Mytrip deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/217:25 pmORD - LHR
1 stop10h 30mIcelandair
mar. 9/309:25 pmLHR - ORD
1 stop26h 50mIcelandair
Deal found 9/14$508
This Billigflug deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Billigflug is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/217:10 amORD - LHR
1 stop22h 40mAir Canada
mar. 9/302:10 pmLHR - ORD
Nonstop9h 10mAir Canada
Deal found 9/14$509
This Mytrip deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/56:30 pmORD - LTN
2 stops22h 35mMultiple Airlines
mié. 11/126:50 amLTN - ORD
2 stops16h 30mMultiple Airlines
Deal found 9/15$509
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/19:08 pmORD - LHR
1 stop29h 22mUnited Airlines
mar. 11/251:25 pmLHR - ORD
1 stop31h 30mUnited Airlines
Deal found 9/14$510
This Mytrip deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/286:30 pmORD - LGW
2 stops18h 15mMultiple Airlines
jue. 12/48:50 pmLGW - ORD
2 stops26h 30mMultiple Airlines
Deal found 9/15$510

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated septiembre 16, 2025.
Use the filters below to find and compare flights from Illinois to London that are best for you.

Fly from

Illinois

Fly to

London

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

dom. 9/28

4:00 pm-6:20 am

Nonstop8h 20m

London Heathrow

mar. 10/21

6:50 am-12:05 pm

1 stop11h 15m

$507

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

lun. 10/13

5:01 am-9:40 am

1 stop22h 39m

London Heathrow

vie. 10/31

6:35 am-7:25 pm

1 stop17h 50m

$507

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

jue. 12/4

7:20 pm-12:55 pm

2 stops59h 35m

London Heathrow

lun. 12/8

6:40 am-4:45 pm

1 stop16h 05m

$508

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

mié. 12/3

6:30 pm-11:05 pm

2 stops22h 35m

London Luton

mar. 12/9

9:00 am-5:20 pm

2 stops14h 20m

$512

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mar. 10/21

10:40 am-9:35 am

1 stop16h 55m

London Heathrow

lun. 10/27

4:40 pm-3:10 pm

1 stop27h 30m

$512

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mar. 10/14

6:20 pm-11:00 am

1 stop10h 40m

London Heathrow

mié. 10/29

9:00 am-4:10 pm

1 stop12h 10m

$514

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

dom. 9/28

5:30 am-7:15 am

1 stop19h 45m

London Heathrow

vie. 10/17

6:30 am-2:10 pm

1 stop13h 40m

$515

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

mar. 10/14

2:00 pm-12:00 pm

2 stops16h 00m

London Stansted

mar. 10/21

9:45 pm-8:17 pm

2 stops28h 32m

$515

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mar. 10/14

9:42 am-7:15 am

1 stop15h 33m

London Heathrow

jue. 10/23

6:30 am-2:10 pm

1 stop13h 40m

$516

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

dom. 9/28

8:10 pm-1:10 pm

1 stop11h 00m

London Heathrow

jue. 10/16

8:40 am-2:10 pm

1 stop11h 30m

$516

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 60 results
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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?

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 septiembre 16, 2025.

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

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 septiembre 16, 2025.

The most flights from USIL to LON are scheduled on a Tuesday (57 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (46 on average).

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?

    For as low as $507, United Airlines can have you in London from Illinois in 8h 20m. The distance between Illinois and London is about 3939 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Illinois to London one-way?

    For one-way options, check prices for TAP AIR PORTUGAL. According to our data, you can fly for as low as $237. Users have also found prices from $346 and $389 on Scandinavian Airlines and KLM, respectively.

  • 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 Royal Jordanian (71%), American Airlines (68%) or Alaska Airlines (68%) 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 $2,491 for a flight from Illinois to London. The cheapest flight overall is $388 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at $426.

  • 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

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Hayes
Southend-on-Sea
Harrow
Canterbury
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Gatwick
Borehamwood
Aylesbury
Bedford
Wembley
Folkestone
Chichester
Eastbourne
Sutton

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Alternative routes for Illinois to London

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Illinois to London

Discover the top 10 airlines that operate flights from Illinois to London. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated septiembre 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$632FlexibilityNo cancel feeOn-time62%
SWISSCheapest$257Average$701FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$338Average$591FlexibilityNo cancel feeOn-time77%
DeltaCheapest$345Average$927FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$430Average$920FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$450Average$734FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$472Average$654FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$502Average$849FlexibilityNo cancel feeOn-time70%
Aer LingusCheapest$537Average$826FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$547Average$765FlexibilityNo cancel feeOn-time76%

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