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$229+ 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 10/19. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LON
Sep 3 — Sep 101
Thu 9/3
Thu 9/10
1 adult, Economy
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Cheap 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 4, 2026.

This deal was found by Cheapflights users on 7/31. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:30 pm
ORD
-
LGW
1 stop10h 25m
Icelandair
Wed 11/1811:55 am
LGW
-
ORD
1 stop11h 25m
Icelandair
Deal found 7/31$689
This Scandinavian Airlines deal was found by Cheapflights users on 7/30. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/258:15 pm
ORD
-
LHR
2 stops55h 40m
Scandinavian Airlines
Thu 10/297:05 am
LHR
-
ORD
2 stops15h 40m
Scandinavian Airlines
Deal found 7/30$690
This Mytrip deal was found by Cheapflights users on 8/1. 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.
Wed 9/237:25 pm
ORD
-
LGW
2 stops15h 40m
Multiple Airlines
Wed 9/308:50 am
LGW
-
ORD
2 stops18h 35m
Multiple Airlines
Deal found 8/1$690
This Mytrip deal was found by Cheapflights users on 8/2. 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.
Tue 9/297:25 pm
ORD
-
STN
2 stops22h 45m
Multiple Airlines
Sun 10/47:05 am
STN
-
ORD
2 stops17h 10m
Multiple Airlines
Deal found 8/2$690
This Mytrip deal was found by Cheapflights users on 8/1. 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.
Wed 9/237:25 pm
ORD
-
LHR
1 stop18h 55m
Icelandair
Wed 9/309:25 pm
LHR
-
ORD
1 stop26h 50m
Icelandair
Deal found 8/1$691
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/249:20 am
ORD
-
LGW
2 stops41h 55m
Multiple Airlines
Fri 10/3012:35 pm
LGW
-
ORD
1 stop16h 15m
Multiple Airlines
Deal found 7/30$691
This Mytrip deal was found by Cheapflights users on 8/3. 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.
Sun 10/257:30 pm
ORD
-
LTN
2 stops17h 55m
Multiple Airlines
Sat 11/712:15 pm
LTN
-
ORD
2 stops33h 15m
Multiple Airlines
Deal found 8/3$692
This Mytrip deal was found by Cheapflights users on 7/31. 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.
Mon 9/147:25 pm
ORD
-
LGW
2 stops17h 00m
Multiple Airlines
Mon 9/216:05 pm
LGW
-
ORD
2 stops30h 10m
Multiple Airlines
Deal found 7/31$692
This Mytrip deal was found by Cheapflights users on 7/31. 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.
Wed 10/1410:25 pm
ORD
-
STN
2 stops16h 10m
Multiple Airlines
Wed 10/284:40 pm
STN
-
ORD
2 stops30h 05m
Multiple Airlines
Deal found 7/31$692
This Gotogate deal was found by Cheapflights users on 7/30. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/187:25 pm
ORD
-
LHR
1 stop10h 30m
Icelandair
Wed 10/2812:15 pm
LHR
-
ORD
1 stop11h 05m
Icelandair
Deal found 7/30$693
This Mytrip deal was found by Cheapflights users on 8/3. 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.
Mon 9/77:25 pm
ORD
-
STN
2 stops15h 25m
Multiple Airlines
Tue 9/1512:45 pm
STN
-
ORD
2 stops35h 30m
Multiple Airlines
Deal found 8/3$693
This Booking.com deal was found by Cheapflights users on 8/1. 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.
Sat 11/77:15 pm
ORD
-
LHR
1 stop17h 15m
Scandinavian Airlines
Sun 11/89:05 pm
LHR
-
ORD
2 stops25h 40m
Scandinavian Airlines
Deal found 8/1$694

Find 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 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$689

One-way from

$229
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$756

Good round-trip deal

$1,001 or less

Good one-way deal

$401 or less
Provider with most accurate pricing for Chicago (CHI)-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-London (LON) flights.
Search Deals
From Illinois to London (LON)
Search Deals
One-way flight from Illinois to London (LON)
Search Deals
Highest demand for flights based on searches. 26% potential increase in price ($292 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($52 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals
Price to beat on a round-trip flight from Illinois to London (LON).
Search Deals
Price to beat on a one-way flight from Illinois to London (LON).
Search Deals

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 August 4, 2026.
Use the filters below to find and compare flights from Illinois to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Wed 10/7

3:45 pm-9:00 am

1 stop11h 15m

London Luton

Mon 10/12

6:25 am-5:50 pm

2 stops17h 25m

$717

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Wed 9/16

10:25 pm-10:15 pm

2 stops17h 50m

London Luton

Wed 9/23

12:45 pm-2:00 pm

2 stops31h 15m

$733

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Tue 9/22

7:25 pm-10:50 pm

2 stops21h 25m

London Luton

Fri 9/25

8:30 am-9:25 pm

2 stops18h 55m

$760

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Wed 8/26

7:25 pm-12:10 am

2 stops22h 45m

London Luton

Wed 9/23

3:15 pm-6:15 pm

3 stops33h 00m

$775

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 11/1

8:10 pm-8:35 pm

2 stops18h 25m

London Gatwick

Sat 11/14

4:35 pm-3:30 pm

1 stop28h 55m

$785

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Thu 9/17

8:10 pm-4:50 pm

1 stop38h 40m

London Stansted

Tue 9/22

5:35 pm-9:40 am

1 stop22h 05m

$832

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Tue 9/22

11:25 am-4:50 pm

1 stop23h 25m

London Stansted

Wed 9/30

5:45 pm-9:40 am

1 stop21h 55m

$833

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Wed 9/30

8:10 pm-4:40 pm

1 stop38h 30m

London Stansted

Wed 10/7

6:55 am-9:40 am

1 stop32h 45m

$833

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Wed 9/30

8:10 pm-10:10 pm

1 stop20h 00m

London Stansted

Thu 10/15

5:35 pm-9:40 am

1 stop22h 05m

$863

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 9/17

7:35 am-9:20 am

2 stops19h 45m

London Heathrow

Sun 10/11

6:40 am-4:10 pm

2 stops15h 30m

$870

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 60 resultsSorted by cheapest first
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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, January is the cheapest month in which you can book a flight from Illinois to London (average of $651). Flying from Illinois to London in June is currently the most expensive (average of $1,381). 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 August 4, 2026.

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 August 4, 2026.

The most flights from USIL to LON are scheduled on a Monday (58 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (40 on average).

How much does it cost to fly round-trip from Illinois to London?

Airfare is typical for this route at the moment.
Illinois to London flights typically cost between $654 and $955 in November.
The cheapest round-trip price found within the last 5 days was $689 on Icelandair (Nov 10-Nov 18).

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

To ensure you get the cheapest price possible for a flight from Illinois to London, you should look to book at least 74 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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 $785, TAP AIR PORTUGAL can have you in London from Illinois in 18h 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 cheapest airlines to fly from Illinois to London one-way?

    For one-way options, check prices for Finnair. According to our data, you can fly for as low as $279. Users have also found prices from $289 and $292 on Icelandair and Brussels Airlines, respectively.

  • What are the most popular routes from Illinois to London?

    While some choose either Chicago O'Hare Intl - London Stansted or Chicago O'Hare Intl - London Gatwick, 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 $3,428 for a flight from Illinois to London. The cheapest flight overall is $324 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at $652.

  • 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, January is the cheapest month in which you can book a flight from Illinois to London (average of $651). Flying from Illinois to London in June is currently the most expensive (average of $1,381). 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
Ilford
Dorking
Hounslow
Winchester
Croydon
Gatwick
Wembley
Harrow
Eastleigh
Southend-on-Sea
Watford
Dartford
Chipping Norton
Kingston upon Thames
Eastbourne
Slough
Stansted
Sutton
Luton
Harlow

Browse thousands of different options on Cheapflights for your next trip

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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 August 4, 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$362Average$781FlexibilityNo cancel feeOn-time67%
TAP AIR PORTUGALCheapest$428Average$721FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$430Average$559FlexibilityNo cancel feeOn-time76%
SWISSCheapest$458Average$786FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$476Average$621FlexibilityNo cancel feeOn-time77%
FinnairCheapest$516Average$835FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$520Average$893FlexibilityNo cancel feeOn-time70%
Alaska AirlinesCheapest$522Average$809FlexibilityNo cancel feeOn-time75%
IberiaCheapest$527Average$796FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$577Average$1,062FlexibilityNo cancel feeOn-time69%

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