HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
London

$273+ 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 7/13. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LON
Jun 20 — Jun 271
Sat 6/20
Sat 6/27
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to London with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 May 21, 2026.

This oojo deal was found by Cheapflights users on 5/18. 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.
Sun 9/67:15 pm
ORD
-
LHR
1 stop20h 25m
Scandinavian Airlines
Thu 9/177:05 am
LHR
-
ORD
2 stops15h 05m
Scandinavian Airlines
Deal found 5/18$850
This Mytrip deal was found by Cheapflights users on 5/17. 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 11/36:30 pm
ORD
-
LTN
2 stops21h 30m
Multiple Airlines
Tue 11/104:20 pm
LTN
-
ORD
3 stops31h 00m
Multiple Airlines
Deal found 5/17$852
This oojo deal was found by Cheapflights users on 5/17. 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.
Sat 9/127:15 pm
ORD
-
LHR
1 stop17h 15m
Scandinavian Airlines
Tue 9/226:40 am
LHR
-
ORD
1 stop15h 30m
Scandinavian Airlines
Deal found 5/17$853
This Gotogate deal was found by Cheapflights users on 5/17. 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.
Mon 11/96:50 pm
ORD
-
LCY
1 stop12h 00m
SWISS
Thu 11/199:15 am
LCY
-
ORD
1 stop13h 05m
SWISS
Deal found 5/17$853
This Trip.com deal was found by Cheapflights users on 5/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/35:20 pm
ORD
-
LGW
1 stop16h 25m
Virgin Atlantic
Tue 11/1010:00 am
LGW
-
ORD
1 stop11h 10m
Virgin Atlantic
Deal found 5/17$853
This Iberia deal was found by Cheapflights users on 5/16. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/225:50 pm
ORD
-
LHR
Nonstop7h 50m
Iberia
Tue 10/277:30 am
LHR
-
ORD
1 stop13h 25m
Iberia
Deal found 5/16$854
This Mytrip deal was found by Cheapflights users on 5/16. 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 7/19:50 am
ORD
-
LTN
2 stops20h 45m
Multiple Airlines
Wed 11/187:45 am
LTN
-
ORD
2 stops15h 35m
Multiple Airlines
Deal found 5/16$854
This Mytrip deal was found by Cheapflights users on 5/16. 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 6/24:37 pm
ORD
-
LGW
2 stops18h 58m
Multiple Airlines
Sat 6/61:00 pm
LGW
-
ORD
2 stops33h 00m
Multiple Airlines
Deal found 5/16$854
This Mytrip deal was found by Cheapflights users on 5/18. 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.
Fri 6/124:37 pm
ORD
-
STN
2 stops18h 58m
Multiple Airlines
Wed 6/176:30 am
STN
-
ORD
3 stops18h 55m
Multiple Airlines
Deal found 5/18$854
This Gotogate deal was found by Cheapflights users on 5/17. 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.
Thu 8/277:25 pm
ORD
-
LHR
1 stop10h 30m
Icelandair
Mon 8/311:05 pm
LHR
-
ORD
1 stop11h 10m
Icelandair
Deal found 5/17$855
This Mytrip deal was found by Cheapflights users on 5/16. 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.
Sat 8/110:25 pm
ORD
-
LTN
2 stops12h 35m
Multiple Airlines
Wed 8/1212:45 pm
LTN
-
ORD
2 stops29h 55m
Multiple Airlines
Deal found 5/16$855
This Mytrip deal was found by Cheapflights users on 5/17. 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 6/108:50 am
ORD
-
LGW
2 stops26h 15m
Multiple Airlines
Wed 6/178:50 am
LGW
-
ORD
2 stops16h 35m
Multiple Airlines
Deal found 5/17$855

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 May 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$850
(oojo)

One-way from

$273
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$933

Good round-trip deal

$977 or less

Good one-way deal

$502 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. 25% potential increase in price ($274 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($48 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 21, 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 - LHR

ORDLHR

Chicago O'Hare Intl

Mon 7/20

10:30 pm-12:15 pm

Nonstop7h 45m

London Heathrow

Tue 8/25

10:20 am-5:50 pm

1 stop13h 30m

$859

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 7/19

10:30 pm-12:15 pm

Nonstop7h 45m

London Heathrow

Tue 8/25

7:30 am-5:50 pm

1 stop16h 20m

$859

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 8/10

5:10 pm-4:00 pm

1 stop16h 50m

London Gatwick

Tue 8/18

5:00 pm-3:10 pm

1 stop28h 10m

$882

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Wed 9/9

8:10 pm-9:55 am

1 stop31h 45m

London Stansted

Wed 9/23

6:55 am-9:40 am

1 stop32h 45m

$884

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Tue 11/3

6:10 pm-4:35 pm

2 stops16h 25m

London City

Tue 11/10

8:05 pm-2:25 pm

1 stop24h 20m

$893

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Fri 11/13

8:10 pm-3:45 pm

1 stop13h 35m

London Gatwick

Thu 11/19

4:00 pm-3:30 pm

1 stop29h 30m

$902

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 8/5

3:31 pm-1:15 pm

1 stop15h 44m

London Heathrow

Thu 8/13

6:15 am-4:24 pm

2 stops16h 09m

$911

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Sat 7/4

7:25 pm-11:00 pm

2 stops21h 35m

London Luton

Wed 7/15

3:15 pm-12:40 pm

2 stops27h 25m

$921

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 11/8

7:00 am-9:00 am

2 stops20h 00m

London Gatwick

Sun 11/15

10:00 am-3:10 pm

1 stop11h 10m

$925

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Wed 6/17

2:15 pm-10:20 pm

2 stops26h 05m

London Luton

Tue 6/23

12:45 pm-4:00 pm

2 stops33h 15m

$926

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/16

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

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 $646). Flying from Illinois to London in February is currently the most expensive (average of $1,334). 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 May 21, 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 May 21, 2026.

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 (30 on average).

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

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 32 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 $859, Finnair can have you in London from Illinois in 7h 45m. 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 JetBlue. According to our data, you can fly for as low as $135. Users have also found prices from $219 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 Gatwick or Chicago O'Hare Intl - London Stansted, 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 (82%), Austrian Airlines (82%) or United Airlines (82%) 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 $2,452 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 $699.

  • 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 $646). Flying from Illinois to London in February is currently the most expensive (average of $1,334). 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
Dorking
Winchester
Croydon
Gatwick
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Orpington
Watford
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
Slough
Stansted
Sutton

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 May 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$240FlexibilityNo cancel feeOn-time62%
Scandinavian AirlinesCheapest$321Average$581FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$428Average$689FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$465Average$682FlexibilityNo cancel feeOn-time76%
FinnairCheapest$516Average$845FlexibilityNo cancel feeOn-time76%
Alaska AirlinesCheapest$522Average$809FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$527Average$760FlexibilityNo cancel feeOn-time70%
SWISSCheapest$562Average$761FlexibilityNo cancel feeOn-time79%
Aer LingusCheapest$568Average$861FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$574Average$905FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.