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$233+ 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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LON
Nov 26 — Dec 31
Wed 11/26
Wed 12/3
1 adult, Economy
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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 October 27, 2025.

This FlightHub deal was found by Cheapflights users on 10/25. 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 12/96:30 pmORD - LHR
1 stop10h 20mIcelandair
Sun 12/1412:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 10/25$534
This Mytrip deal was found by Cheapflights users on 10/25. 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 12/56:30 pmORD - LGW
2 stops19h 45mMultiple Airlines
Sat 12/139:05 pmLGW - ORD
2 stops26h 15mMultiple Airlines
Deal found 10/25$534
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
Wed 11/266:30 pmORD - LGW
1 stop10h 25mIcelandair
Wed 12/311:55 amLGW - ORD
1 stop11h 25mIcelandair
Deal found 10/27$536
This Gotogate deal was found by Cheapflights users on 10/26. 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.
Wed 12/106:30 pmORD - LHR
1 stop19h 00mIcelandair
Wed 12/178:35 pmLHR - ORD
1 stop26h 45mIcelandair
Deal found 10/26$537
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
Sun 11/96:30 pmORD - LGW
1 stop10h 25mIcelandair
Mon 11/1711:55 amLGW - ORD
1 stop11h 25mIcelandair
Deal found 10/26$537
This Mytrip deal was found by Cheapflights users on 10/25. 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 11/263:35 pmORD - LGW
2 stops18h 45mMultiple Airlines
Wed 12/38:30 amLGW - ORD
2 stops17h 35mMultiple Airlines
Deal found 10/25$538
This Justfly.com deal was found by Cheapflights users on 10/26. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/117:10 amORD - LHR
2 stops20h 10mScandinavian Airlines
Sat 11/226:40 amLHR - ORD
1 stop16h 05mScandinavian Airlines
Deal found 10/26$539
This FlightHub deal was found by Cheapflights users on 10/25. 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 11/288:15 pmORD - LGW
1 stop13h 30mTAP AIR PORTUGAL
Sat 12/64:35 pmLGW - ORD
1 stop28h 10mTAP AIR PORTUGAL
Deal found 10/25$539
This Mytrip deal was found by Cheapflights users on 10/26. 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 11/257:40 pmORD - LGW
1 stop16h 50mMultiple Airlines
Thu 11/278:50 amLGW - ORD
1 stop11h 10mMultiple Airlines
Deal found 10/26$540
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
Fri 12/56:30 pmORD - LHR
1 stop19h 00mIcelandair
Sat 12/1312:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 10/27$541
This Kiwi.com deal was found by Cheapflights users on 10/25. 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.
Thu 11/66:30 pmORD - LHR
1 stop19h 00mIcelandair
Wed 11/198:35 pmLHR - ORD
1 stop26h 45mIcelandair
Deal found 10/25$542
This Mytrip deal was found by Cheapflights users on 10/24. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1012:50 pmORD - LGW
2 stops25h 20mMultiple Airlines
Wed 12/178:30 amLGW - ORD
2 stops17h 35mMultiple Airlines
Deal found 10/24$545

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 October 27, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$534
(FlightHub)

One-way from

$233
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$670

Good round-trip deal

$705 or less

Good one-way deal

$436 or less
Provider with most accurate pricing for Chicago (CHI)-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-London (LON) flights.
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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 ($202 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 October 2025
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 October 27, 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

Fri 1/9

7:20 pm-8:55 am

2 stops31h 35m

London Heathrow

Mon 1/12

6:40 am-9:35 pm

2 stops20h 55m

$536

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 1/29

10:40 am-4:00 pm

2 stops23h 20m

London Heathrow

Tue 2/3

6:05 pm-4:45 pm

2 stops28h 40m

$548

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Tue 11/25

9:50 pm-9:20 pm

2 stops17h 30m

London Stansted

Tue 12/2

9:45 pm-1:10 pm

2 stops21h 25m

$549

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Sat 12/6

6:30 pm-8:55 pm

2 stops20h 25m

London Luton

Wed 12/10

9:40 pm-5:20 pm

2 stops25h 40m

$550

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Wed 11/26

9:50 pm-10:50 pm

2 stops19h 00m

London Stansted

Wed 12/3

6:30 am-6:25 pm

2 stops17h 55m

$551

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Wed 11/12

7:05 am-5:50 pm

3 stops28h 45m

London Stansted

Tue 11/18

6:45 pm-1:10 pm

2 stops24h 25m

$552

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 11/11

7:10 am-9:20 am

2 stops20h 10m

London Heathrow

Mon 11/17

6:40 am-4:45 pm

1 stop16h 05m

$571

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 2/26

10:40 am-9:20 am

2 stops16h 40m

London Heathrow

Sun 3/1

6:40 am-4:45 pm

2 stops16h 05m

$575

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 12/7

6:30 pm-10:55 am

1 stop10h 25m

London Gatwick

Tue 12/16

11:55 am-5:20 pm

1 stop11h 25m

$585

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sat 12/6

6:30 pm-10:55 am

1 stop10h 25m

London Gatwick

Tue 12/16

11:55 am-5:20 pm

1 stop11h 25m

$585

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/26

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, May is the cheapest month in which you can book a flight from Illinois to London (average of $397). Flying from Illinois to London in July is currently the most expensive (average of $611). 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 October 27, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 31% on flights from Illinois to London by exploring options for tickets in the evening.

What is the cheapest day to fly from Illinois to London?

Use this chart to determine the cheapest time to fly round-trip from Illinois to London. Price data was last updated on November 10, 2024.

Travelers seeking maximum savings on their Illinois to London flight should consider departing on Tuesday evenings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 October 27, 2025.

The most flights from USIL to LON are scheduled on a Sunday (45 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (36 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 $585, Scandinavian Airlines can have you in London from Illinois in 10h 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 JetBlue. According to our data, you can fly for as low as $324. Users have also found prices from $400 and $498 on Lufthansa and United 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 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 (80%), SriLankan Airlines (74%) or Gulf Air (74%) 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 $2,566 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 $439.

  • 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, May is the cheapest month in which you can book a flight from Illinois to London (average of $397). Flying from Illinois to London in July is currently the most expensive (average of $611). 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
Ilford
Hayes
Southend-on-Sea
Harrow
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Gatwick
Borehamwood
Aylesbury
Bedford
Chipping Norton
Wembley
Folkestone
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 October 27, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$636FlexibilityNo cancel feeOn-time62%
SWISSCheapest$257Average$701FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$338Average$566FlexibilityNo cancel feeOn-time77%
DeltaCheapest$345Average$949FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$430Average$947FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$450Average$660FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$479Average$659FlexibilityNo cancel feeOn-time76%
Alaska AirlinesCheapest$487Average$677FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$502Average$854FlexibilityNo cancel feeOn-time70%
Aer LingusCheapest$502Average$824FlexibilityNo cancel feeOn-timeN/A

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