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$246+ 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 1/14. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LON
Jan 9 — Jan 161
Fri 1/9
Fri 1/16
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 December 10, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/9. 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 12/311:24 pmORD - LHR
1 stop11h 16mMultiple Airlines
Thu 1/1511:10 amLHR - ORD
1 stop13h 15mMultiple Airlines
Deal found 12/9$571
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 12/311:24 pmORD - LHR
1 stop11h 16mMultiple Airlines
Wed 1/146:50 amLHR - ORD
1 stop11h 20mMultiple Airlines
Deal found 12/10$576
This oojo deal was found by Cheapflights users on 12/10. 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 12/306:30 pmORD - LHR
1 stop10h 20mIcelandair
Sat 1/318:35 pmLHR - ORD
1 stop26h 45mIcelandair
Deal found 12/10$580
This Cheapflightsfares deal was found by Cheapflights users on 12/7. 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.
Wed 12/102:40 pmORD - LHR
1 stop13h 00mMultiple Airlines
Fri 1/166:00 amLHR - ORD
1 stop12h 45mMultiple Airlines
Deal found 12/7$584
This Kiwi.com deal was found by Cheapflights users on 12/8. 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.
Tue 12/301:24 pmORD - LHR
1 stop11h 16mAustrian Airlines
Fri 1/94:20 pmLHR - ORD
1 stop32h 17mAustrian Airlines
Deal found 12/8$603
This Icelandair deal was found by Cheapflights users on 12/9. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:30 pmORD - LHR
1 stop10h 20mIcelandair
Sat 1/1712:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 12/9$605
This United Airlines deal was found by Cheapflights users on 12/9. 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.
Wed 12/313:45 pmORD - LHR
Nonstop8h 10mUnited Airlines
Tue 1/2011:10 amLHR - ORD
1 stop13h 15mUnited Airlines
Deal found 12/9$612
This United Airlines deal was found by Cheapflights users on 12/7. 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.
Wed 12/103:45 pmORD - LHR
Nonstop8h 10mUnited Airlines
Fri 1/1611:10 amLHR - ORD
1 stop13h 15mUnited Airlines
Deal found 12/7$614
This Kiwi.com deal was found by Cheapflights users on 12/8. 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 12/101:05 pmORD - LHR
1 stop15h 45mAustrian Airlines
Wed 12/1712:05 pmLHR - ORD
1 stop12h 26mAustrian Airlines
Deal found 12/8$616
This Delta deal was found by Cheapflights users on 12/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:05 amORD - LHR
1 stop17h 45mDelta
Wed 1/218:40 amLHR - ORD
1 stop11h 40mDelta
Deal found 12/9$618
This Air Canada deal was found by Cheapflights users on 12/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/103:35 pmORD - LHR
1 stop9h 35mAir Canada
Fri 3/206:50 amLHR - ORD
2 stops16h 55mAir Canada
Deal found 12/10$620
This Cheapflightsfares deal was found by Cheapflights users on 12/7. 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.
Wed 12/106:30 pmORD - LGW
1 stop10h 25mIcelandair
Fri 1/1611:55 amLGW - ORD
1 stop11h 25mIcelandair
Deal found 12/7$620

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 December 10, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$555
(Mytrip)

One-way from

$246
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$833

Good round-trip deal

$677 or less

Good one-way deal

$443 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 ($206 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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Price to beat on a round-trip flight from Illinois to London (LON).
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Price to beat on a one-way flight from Illinois to London (LON).
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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 December 10, 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 3/6

7:00 am-9:20 am

2 stops20h 20m

London Heathrow

Sun 3/15

9:05 pm-5:45 pm

2 stops25h 40m

$568

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Wed 1/14

9:00 pm-9:05 pm

1 stop18h 05m

London Stansted

Thu 1/22

6:30 am-7:15 pm

1 stop18h 45m

$577

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Wed 1/14

9:00 pm-9:05 pm

1 stop18h 05m

London Stansted

Wed 1/21

8:30 am-7:15 pm

1 stop16h 45m

$577

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Wed 1/14

9:00 pm-5:05 pm

1 stop14h 05m

London Luton

Thu 1/22

9:00 am-7:15 pm

1 stop16h 15m

$583

ChicagoLondon

MDW - LGW

MDWLGW

Chicago Midway

Fri 1/16

10:04 am-10:00 am

1 stop17h 56m

London Gatwick

Fri 1/23

2:00 pm-8:43 am

2 stops24h 43m

$590

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 3/6

7:00 am-9:20 am

2 stops20h 20m

London Heathrow

Sat 3/14

6:40 am-5:45 pm

1 stop16h 05m

$611

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 1/11

5:50 pm-7:55 am

Nonstop8h 05m

London Heathrow

Wed 1/21

11:10 am-6:25 pm

1 stop13h 15m

$620

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 1/13

9:05 pm-11:15 am

Nonstop8h 10m

London Heathrow

Tue 1/27

6:50 am-12:10 pm

1 stop11h 20m

$620

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 1/14

9:05 pm-11:15 am

Nonstop8h 10m

London Heathrow

Tue 1/27

9:00 am-4:20 pm

1 stop13h 20m

$620

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 2/17

9:05 pm-11:15 am

Nonstop8h 10m

London Heathrow

Thu 2/26

6:35 am-2:10 pm

1 stop13h 35m

$620

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

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 $604). 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 December 10, 2025.

Unlike in the morning, 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 December 16, 2024.

Travelers seeking maximum savings on their Illinois to London flight should consider departing on Sunday evenings when fares are most often at their lowest. Saturday at noon 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 December 10, 2025.

The most flights from USIL to LON are scheduled on a Monday (45 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (39 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 $620, Scandinavian Airlines can have you in London from Illinois in 8h 05m. 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 $207 and $218 on Scandinavian Airlines and Icelandair, 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 Air Canada (64%), Austrian Airlines (64%) or United Airlines (64%) 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 $2,529 for a flight from Illinois to London. The cheapest flight overall is $374 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at $431.

  • 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 $604). 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
Eastleigh
Dartford
Dover
Winchester
Croydon
Orpington
Watford
Hayes
Borehamwood
Aylesbury
Chipping Norton
Horley
Kingston upon Thames
Wembley
Folkestone
Eastbourne

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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 December 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$632FlexibilityNo cancel feeOn-time62%
SWISSCheapest$257Average$674FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$338Average$577FlexibilityNo cancel feeOn-time77%
DeltaCheapest$345Average$927FlexibilityNo cancel feeOn-timeN/A
TAP AIR PORTUGALCheapest$450Average$639FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$460Average$965FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$481Average$653FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$502Average$855FlexibilityNo cancel feeOn-time70%
Aer LingusCheapest$505Average$793FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$522Average$919FlexibilityNo cancel feeOn-time75%

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