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$215+ 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 7/23. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LON
Jun 20 — Jun 271
Fri 6/20
Fri 6/27
1 adult, Economy
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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 June 15, 2025.

Round-trip from

$668
(Scandinavian Airlines)

One-way from

$215
(Mytrip)

Popular in

June

Cheapest in

February

Average price

$1,144

Good round-trip deal

$667 or less

Good one-way deal

$496 or less
From Illinois to London (LON)
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One-way flight from Illinois to London (LON)
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Highest demand for flights based on searches. 21% potential increase in price ($206 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).
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Average for round-trip flights in June 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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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 June 15, 2025.

This Scandinavian Airlines deal was found by Cheapflights users on 6/14. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/157:15 pmORD - LHR
2 stops17h 15mScandinavian Airlines
Sat 8/235:30 pmLHR - ORD
2 stops28h 40mScandinavian Airlines
Deal found 6/14$668
This FlightHub deal was found by Cheapflights users on 6/14. 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 8/157:25 pmORD - LGW
1 stop10h 20mIcelandair
Sat 8/233:40 pmLGW - ORD
1 stop32h 35mIcelandair
Deal found 6/14$668
This Kiwi.com deal was found by Cheapflights users on 6/13. 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 8/227:25 pmORD - LHR
1 stop10h 30mIcelandair
Tue 8/261:05 pmLHR - ORD
1 stop11h 10mIcelandair
Deal found 6/13$669
This SWISS deal was found by Cheapflights users on 6/13. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/127:05 pmORD - LCY
1 stop11h 25mSWISS
Thu 11/69:15 amLCY - ORD
1 stop13h 00mSWISS
Deal found 6/13$669
This Mytrip deal was found by Cheapflights users on 6/13. 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 10/112:00 pmORD - STN
2 stops28h 20mMultiple Airlines
Thu 10/166:55 amSTN - ORD
3 stops36h 19mMultiple Airlines
Deal found 6/13$669
This Delta deal was found by Cheapflights users on 6/13. 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.
Sun 8/315:00 pmORD - LHR
1 stop9h 55mDelta
Tue 12/99:00 amLHR - ORD
1 stop12h 10mDelta
Deal found 6/13$670
This Mytrip deal was found by Cheapflights users on 6/14. 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 8/167:25 pmORD - LTN
2 stops14h 20mMultiple Airlines
Sat 8/238:45 amLTN - ORD
2 stops18h 30mMultiple Airlines
Deal found 6/14$671
This Virgin Atlantic deal was found by Cheapflights users on 6/14. 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.
Thu 8/141:25 pmORD - LGW
1 stop14h 35mVirgin Atlantic
Thu 8/2112:00 pmLGW - ORD
2 stops17h 56mVirgin Atlantic
Deal found 6/14$671
This Cheapflightsfares deal was found by Cheapflights users on 6/13. 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 8/53:16 pmORD - LHR
1 stop10h 34mIberia
Tue 8/129:15 amLHR - ORD
Nonstop8h 40mIberia
Deal found 6/13$672
This SWISS deal was found by Cheapflights users on 6/14. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/282:20 pmORD - LGW
1 stop21h 30mSWISS
Mon 8/116:35 pmLGW - ORD
1 stop27h 20mSWISS
Deal found 6/14$672
This United Airlines deal was found by Cheapflights users on 6/13. 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.
Sun 7/279:25 pmORD - LHR
Nonstop8h 20mUnited Airlines
Tue 8/129:30 amLHR - ORD
1 stop16h 46mUnited Airlines
Deal found 6/13$674
This SWISS deal was found by Cheapflights users on 6/13. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/297:05 pmORD - LHR
1 stop11h 55mSWISS
Mon 8/118:05 pmLHR - ORD
1 stop25h 50mSWISS
Deal found 6/13$675

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 15, 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 8/15

7:15 pm-6:30 pm

2 stops17h 15m

London Heathrow

Sat 8/23

5:30 pm-4:10 pm

2 stops28h 40m

$668

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Fri 8/15

7:25 pm-11:45 am

1 stop10h 20m

London Gatwick

Sat 8/23

3:40 pm-6:15 pm

1 stop32h 35m

$668

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Sun 10/12

7:05 pm-5:30 pm

1 stop16h 25m

London City

Wed 11/5

9:25 am-4:15 pm

1 stop12h 50m

$669

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Sat 10/11

2:00 pm-12:20 am

2 stops28h 20m

London Stansted

Thu 10/16

6:55 am-1:14 pm

3 stops36h 19m

$669

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 8/22

7:25 pm-11:55 am

1 stop10h 30m

London Heathrow

Tue 8/26

1:05 pm-6:15 pm

1 stop11h 10m

$669

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 8/31

5:00 pm-8:55 am

1 stop9h 55m

London Heathrow

Tue 12/9

9:00 am-3:10 pm

1 stop12h 10m

$670

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Thu 8/14

1:25 pm-10:00 am

1 stop14h 35m

London Gatwick

Thu 8/21

12:00 pm-11:56 pm

2 stops17h 56m

$671

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Sat 8/16

7:25 pm-3:45 pm

2 stops14h 20m

London Luton

Sat 8/23

8:45 am-9:15 pm

2 stops18h 30m

$671

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 8/5

3:16 pm-7:50 am

1 stop10h 34m

London Heathrow

Tue 8/12

9:15 am-11:55 am

Nonstop8h 40m

$672

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 7/28

2:20 pm-5:50 pm

1 stop21h 30m

London Gatwick

Mon 8/11

6:35 pm-3:55 pm

1 stop27h 20m

$672

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/13

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, November is the cheapest month in which you can book a flight from Illinois to London (average of $661). Flying from Illinois to London in June is currently the most expensive (average of $1,108). 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 15, 2025.

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 15, 2025.

The most flights from USIL to LON are scheduled on a Monday (57 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (52 on average).

Rainfall in London by month

Plan your trip to London by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London when rainfall is around 1.6 in.

Temperature in London by month

Plan your trip to London by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated June 15, 2025.
To help decide which airline to fly from Illinois to London, see what other customers have to say about Delta, Porter Airlines and KLM. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,963 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,963 reviews
Delta
8.0
Very good
7,963 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Porter Airlines
8.0
Very good
289 reviews
Delta
8.0
Very good
7,963 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,361 reviews
Delta
8.0
Very good
7,963 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Austrian Airlines
7.6
Good
803 reviews
Delta
8.0
Very good
7,963 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Finnair
7.6
Good
1,290 reviews
Delta
8.0
Very good
7,963 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

  • What are the cheapest airlines to fly from Illinois to London one-way?

    For one-way options, check prices for TAP AIR PORTUGAL. According to our data, you can fly for as low as $377. Users have also found prices from $378 and $380 on Icelandair and Air Canada, 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 (81%), SriLankan Airlines (75%) or Air Canada (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 $2,680 for a flight from Illinois to London. The cheapest flight overall is $412 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at $367.

  • 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 $661). Flying from Illinois to London in June is currently the most expensive (average of $1,108). 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 Illinois?

Book flights to Illinois if you plan to visit one of these locations
Hayes
Hounslow
Thornton Heath
Luton
Canterbury
Harrow
Dover
Gatwick
Orpington
Watford
Croydon
Folkestone
Borehamwood
Sutton
Aylesbury
Chelmsford
Brentwood
Chichester
Wembley
Arundel

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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 June 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
SWISSCheapest$257Average$700FlexibilityNo cancel feeOn-time79%
DeltaCheapest$345Average$935FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$381Average$601FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$440Average$921FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$465Average$649FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$507Average$792FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$516Average$869FlexibilityNo cancel feeOn-time62%
Air CanadaCheapest$554Average$751FlexibilityNo cancel feeOn-time67%
FinnairCheapest$567Average$745FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$569Average$803FlexibilityNo cancel feeOn-timeN/A

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