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$151+ 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 2/2. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LON
Feb 24 — Mar 31
Tue 2/24
Tue 3/3
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 January 25, 2026.

This oojo deal was found by Cheapflights users on 1/23. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:25 pm
ORD
-
LHR
1 stop10h 30m
Icelandair
Wed 5/61:05 pm
LHR
-
ORD
1 stop11h 10m
Icelandair
Deal found 1/23$519
This oojo deal was found by Cheapflights users on 1/23. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/2410:25 pm
ORD
-
LHR
1 stop15h 55m
Icelandair
Fri 5/89:25 pm
LHR
-
ORD
1 stop26h 50m
Icelandair
Deal found 1/23$520
This Mytrip deal was found by Cheapflights users on 1/22. 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 2/116:30 pm
ORD
-
LTN
2 stops16h 35m
Multiple Airlines
Wed 2/186:50 am
LTN
-
ORD
2 stops16h 30m
Multiple Airlines
Deal found 1/22$521
This Kiwi.com deal was found by Cheapflights users on 1/24. 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.
Mon 2/912:44 pm
ORD
-
LGW
1 stop15h 16m
Multiple Airlines
Mon 2/232:00 pm
LGW
-
ORD
2 stops32h 52m
Multiple Airlines
Deal found 1/24$521
This Cheapflightsfares deal was found by Cheapflights users on 1/24. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/147:25 pm
ORD
-
LHR
1 stop10h 30m
Icelandair
Mon 4/201:05 pm
LHR
-
ORD
1 stop11h 10m
Icelandair
Deal found 1/24$522
This Mytrip deal was found by Cheapflights users on 1/23. 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 4/127:25 pm
ORD
-
LTN
2 stops20h 15m
Multiple Airlines
Mon 4/208:15 am
LTN
-
ORD
2 stops16h 00m
Multiple Airlines
Deal found 1/23$522
This Mytrip deal was found by Cheapflights users on 1/23. 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 4/127:25 pm
ORD
-
STN
2 stops22h 00m
Multiple Airlines
Mon 4/206:30 am
STN
-
ORD
2 stops17h 45m
Multiple Airlines
Deal found 1/23$522
This FlightHub deal was found by Cheapflights users on 1/24. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/287:25 pm
ORD
-
LHR
1 stop10h 30m
Icelandair
Thu 5/71:05 pm
LHR
-
ORD
1 stop11h 10m
Icelandair
Deal found 1/24$523
This Mytrip deal was found by Cheapflights users on 1/23. 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.
Thu 4/167:25 pm
ORD
-
LTN
2 stops15h 20m
Multiple Airlines
Wed 4/226:15 am
LTN
-
ORD
2 stops18h 00m
Multiple Airlines
Deal found 1/23$523
This oojo deal was found by Cheapflights users on 1/24. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/110:25 pm
ORD
-
LGW
1 stop10h 15m
Icelandair
Wed 5/133:40 pm
LGW
-
ORD
1 stop11h 45m
Icelandair
Deal found 1/24$523
This KAYAK deal was found by Cheapflights users on 1/24. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/117:30 pm
ORD
-
LHR
1 stop10h 20m
Icelandair
Mon 3/309:25 pm
LHR
-
ORD
1 stop26h 50m
Icelandair
Deal found 1/24$524
This oojo deal was found by Cheapflights users on 1/23. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/177:25 pm
ORD
-
LGW
1 stop13h 15m
Icelandair
Sat 9/263:40 pm
LGW
-
ORD
1 stop32h 35m
Icelandair
Deal found 1/23$525

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 January 25, 2026.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$517
(Mytrip)

One-way from

$284
(Kiwi.com)

Popular in

June

Cheapest in

April

Average price

$666

Good round-trip deal

$641 or less

Good one-way deal

$398 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. 21% potential increase in price ($204 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 25, 2026.
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 - LTN

ORDLTN

Chicago O'Hare Intl

Sun 4/12

7:25 pm-9:40 pm

2 stops20h 15m

London Luton

Mon 4/20

8:15 am-6:15 pm

2 stops16h 00m

$522

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Wed 4/8

7:25 pm-2:40 pm

1 stop13h 15m

London Gatwick

Sun 4/19

3:40 pm-6:15 pm

1 stop32h 35m

$534

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Wed 2/11

6:30 pm-3:05 pm

2 stops14h 35m

London Stansted

Wed 2/18

6:30 am-5:20 pm

2 stops16h 50m

$541

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Fri 2/6

6:30 pm-8:10 pm

2 stops19h 40m

London Luton

Mon 2/9

8:50 am-5:20 pm

2 stops14h 30m

$542

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Sun 2/8

6:30 pm-8:05 pm

2 stops19h 35m

London Stansted

Thu 2/12

6:30 am-5:20 pm

2 stops16h 50m

$545

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Wed 1/28

7:10 pm-3:05 pm

1 stop13h 55m

London Gatwick

Fri 2/6

9:25 pm-2:45 pm

2 stops47h 20m

$567

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Wed 4/22

6:00 pm-2:00 pm

1 stop14h 00m

London Gatwick

Wed 4/29

9:15 pm-4:00 pm

2 stops48h 45m

$570

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 3/9

8:20 pm-4:00 pm

1 stop14h 40m

London Heathrow

Mon 3/16

7:05 am-5:45 pm

2 stops15h 40m

$588

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 2/1

8:25 pm-3:45 pm

1 stop13h 20m

London Gatwick

Tue 3/3

10:40 am-3:00 pm

1 stop34h 20m

$619

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 3/3

5:50 pm-7:55 am

Nonstop8h 05m

London Heathrow

Tue 3/17

6:50 am-1:10 pm

1 stop11h 20m

$622

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/22

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, June is the cheapest month in which you can book a flight from Illinois to London (average of $375). Flying from Illinois to London in July is currently the most expensive (average of $607). 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 January 25, 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 January 25, 2026.

The most flights from USIL to LON are scheduled on a Wednesday (45 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (37 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 $534, Icelandair can have you in London from Illinois in 13h 15m. 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 JetBlue. According to our data, you can fly for as low as $135. Users have also found prices from $218 and $237 on Icelandair and TAP AIR PORTUGAL, 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 Aer Lingus (73%), American Airlines (66%) or Alaska Airlines (66%) 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 $2,466 for a flight from Illinois to London. The cheapest flight overall is $334 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at $411.

  • 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, June is the cheapest month in which you can book a flight from Illinois to London (average of $375). Flying from Illinois to London in July is currently the most expensive (average of $607). 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
Hounslow
Southend-on-Sea
Harrow
Croydon
Eastleigh
Gatwick
Dartford
Dover
Winchester
Orpington
Watford
Hayes
Borehamwood
Aylesbury
Chipping Norton
Horley
Kingston upon Thames
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 January 25, 2026.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$505FlexibilityNo cancel feeOn-time62%
SWISSCheapest$257Average$674FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$331Average$568FlexibilityNo cancel feeOn-time77%
DeltaCheapest$345Average$902FlexibilityNo cancel feeOn-timeN/A
TAP AIR PORTUGALCheapest$427Average$577FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$471Average$679FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$480Average$1,108FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$499Average$782FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$516Average$769FlexibilityNo cancel feeOn-time76%
Alaska AirlinesCheapest$522Average$809FlexibilityNo cancel feeOn-time75%

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