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$219+ 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 7/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LON
Jul 23 — Jul 301
Thu 7/23
Thu 7/30
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 June 23, 2026.

This FlightHub deal was found by Cheapflights users on 6/22. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/207:15 pm
ORD
-
LHR
2 stops15h 10m
Scandinavian Airlines
Fri 11/277:05 am
LHR
-
ORD
2 stops15h 40m
Scandinavian Airlines
Deal found 6/22$932
This Mytrip deal was found by Cheapflights users on 6/23. 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.
Mon 8/243:45 pm
ORD
-
LTN
1 stop15h 00m
Multiple Airlines
Sun 8/309:00 am
LTN
-
ORD
1 stop11h 00m
Multiple Airlines
Deal found 6/23$932
This Virgin Atlantic deal was found by Cheapflights users on 6/23. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/512:29 pm
ORD
-
LCY
2 stops14h 21m
Virgin Atlantic
Mon 10/1910:00 am
LCY
-
ORD
1 stop10h 30m
Virgin Atlantic
Deal found 6/23$932
This Cheapflightsfares deal was found by Cheapflights users on 6/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/610:25 pm
ORD
-
LGW
1 stop10h 15m
Icelandair
Sun 9/203:40 pm
LGW
-
ORD
1 stop11h 45m
Icelandair
Deal found 6/23$932
This Mytrip deal was found by Cheapflights users on 6/22. 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.
Sun 8/163:45 pm
ORD
-
STN
1 stop10h 05m
Multiple Airlines
Sun 8/236:35 am
STN
-
ORD
1 stop13h 25m
Multiple Airlines
Deal found 6/22$932
This United Airlines deal was found by Cheapflights users on 6/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/39:35 pm
ORD
-
LHR
1 stop17h 45m
United Airlines
Sun 10/118:00 am
LHR
-
ORD
Nonstop9h 10m
United Airlines
Deal found 6/22$933
This Mytrip deal was found by Cheapflights users on 6/22. 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.
Fri 10/23:45 pm
ORD
-
LTN
1 stop10h 40m
Multiple Airlines
Tue 10/65:40 am
LTN
-
ORD
2 stops19h 35m
Multiple Airlines
Deal found 6/22$933
This Virgin Atlantic deal was found by Cheapflights users on 6/22. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/410:30 am
ORD
-
LCY
2 stops16h 20m
Virgin Atlantic
Sat 10/108:25 am
LCY
-
ORD
1 stop11h 50m
Virgin Atlantic
Deal found 6/22$933
This Mytrip deal was found by Cheapflights users on 6/23. 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 8/169:00 pm
ORD
-
STN
1 stop13h 50m
Multiple Airlines
Fri 8/211:45 pm
STN
-
ORD
2 stops34h 30m
Multiple Airlines
Deal found 6/23$933
This United Airlines deal was found by Cheapflights users on 6/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/184:30 pm
ORD
-
LHR
Nonstop8h 15m
United Airlines
Mon 8/314:25 pm
LHR
-
ORD
1 stop27h 35m
United Airlines
Deal found 6/22$934
This Mytrip deal was found by Cheapflights users on 6/22. 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 8/193:45 pm
ORD
-
LTN
1 stop11h 15m
Multiple Airlines
Mon 8/247:15 am
LTN
-
ORD
2 stops20h 10m
Multiple Airlines
Deal found 6/22$934
This KLM deal was found by Cheapflights users on 6/22. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/104:50 pm
ORD
-
LCY
1 stop10h 00m
KLM
Wed 8/199:20 am
LCY
-
ORD
1 stop11h 10m
KLM
Deal found 6/22$934

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 June 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$932
(FlightHub)

One-way from

$219
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$1,375

Good round-trip deal

$1,080 or less

Good one-way deal

$467 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 ($283 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($53 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 23, 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

MDW - LHR

MDWLHR

Chicago Midway

Mon 8/24

1:25 pm-7:10 am

1 stop11h 45m

London Heathrow

Thu 9/10

8:40 am-6:19 pm

2 stops15h 39m

$938

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mon 8/10

1:27 pm-7:10 am

1 stop11h 43m

London Heathrow

Wed 8/19

8:40 am-10:36 pm

2 stops19h 56m

$940

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Wed 8/19

9:24 am-6:45 am

2 stops15h 21m

London Heathrow

Wed 9/2

6:30 am-4:59 pm

2 stops16h 29m

$943

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Sat 7/11

6:05 pm-11:25 pm

2 stops23h 20m

London Luton

Tue 7/21

5:45 pm-4:00 pm

2 stops28h 15m

$947

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Sun 8/2

4:20 pm-9:30 am

1 stop11h 10m

London City

Wed 8/19

7:45 am-2:30 pm

1 stop12h 45m

$952

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Sun 8/9

4:20 pm-8:50 am

1 stop10h 30m

London City

Wed 8/19

7:45 am-2:30 pm

1 stop12h 45m

$955

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Mon 8/24

8:10 pm-4:50 pm

1 stop38h 40m

London Stansted

Wed 9/9

5:45 pm-9:40 am

1 stop21h 55m

$956

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Mon 8/24

10:30 am-7:15 am

2 stops14h 45m

London City

Thu 9/10

9:20 am-2:15 pm

1 stop10h 55m

$957

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Mon 8/10

1:00 pm-9:30 am

2 stops14h 30m

London City

Wed 8/19

10:00 am-2:30 pm

1 stop10h 30m

$959

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Thu 7/9

4:45 pm-12:50 am

2 stops26h 05m

London Luton

Thu 7/16

5:30 pm-4:00 pm

2 stops28h 30m

$961

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/19

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, November is the cheapest month in which you can book a flight from Illinois to London (average of $651). Flying from Illinois to London in February is currently the most expensive (average of $1,554). 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 June 23, 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 June 23, 2026.

The most flights from USIL to LON are scheduled on a Tuesday (56 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (46 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 $952, Delta can have you in London from Illinois in 11h 10m. The distance between Illinois and London is about 3957 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 $279 on Icelandair and Finnair, 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 (72%), Austrian Airlines (72%) or United Airlines (72%) 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 $2,325 for a flight from Illinois to London. The cheapest flight overall is $328 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at $617.

  • 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 $651). Flying from Illinois to London in February is currently the most expensive (average of $1,554). 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
Southend-on-Sea
Wembley
Harrow
Eastleigh
Dartford
Dover
Orpington
Watford
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
Slough
Stansted

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 June 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$81FlexibilityNo cancel feeOn-time62%
Scandinavian AirlinesCheapest$384Average$593FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$428Average$696FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$434Average$545FlexibilityNo cancel feeOn-time76%
FinnairCheapest$513Average$817FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$513Average$816FlexibilityNo cancel feeOn-time70%
IberiaCheapest$516Average$749FlexibilityNo cancel feeOn-time77%
Alaska AirlinesCheapest$522Average$809FlexibilityNo cancel feeOn-time75%
SWISSCheapest$562Average$823FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$573Average$1,017FlexibilityNo cancel feeOn-time69%

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