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$359+ Cheap flights from London (LON) to Illinois

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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ORD
Aug 28 — Sep 41
Fri 8/28
Fri 9/4
1 adult, Economy
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Cheap flight deals from London to Illinois

Cheapest flights from London to Illinois
Explore the most affordable flight options available from London to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2026.

This Gotogate deal was found by Cheapflights users on 7/29. 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 9/93:40 pm
LGW
-
ORD
1 stop11h 45m
Icelandair
Sat 9/1210:25 pm
ORD
-
LGW
1 stop10h 10m
Icelandair
Deal found 7/29$655
This Gotogate deal was found by Cheapflights users on 7/29. 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 9/79:25 pm
LHR
-
ORD
1 stop26h 50m
Icelandair
Mon 9/217:25 pm
ORD
-
LHR
1 stop18h 55m
Icelandair
Deal found 7/29$657
This Mytrip deal was found by Cheapflights users on 7/29. 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.
Thu 9/243:50 pm
LTN
-
ORD
3 stops30h 20m
Multiple Airlines
Tue 9/297:15 pm
ORD
-
LTN
2 stops20h 55m
Multiple Airlines
Deal found 7/29$657
This The Travel House deal was found by Cheapflights users on 7/29. 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 The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/262:05 pm
LHR
-
ORD
1 stop26h 10m
Lufthansa
Sat 10/35:07 pm
ORD
-
LHR
1 stop11h 18m
Lufthansa
Deal found 7/29$659
This Gotogate deal was found by Cheapflights users on 7/29. 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 9/91:05 pm
LHR
-
ORD
1 stop14h 20m
Icelandair
Wed 9/167:25 pm
ORD
-
LHR
1 stop18h 55m
Icelandair
Deal found 7/29$661
This oojo deal was found by Cheapflights users on 7/29. 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.
Wed 9/23:40 pm
LGW
-
ORD
1 stop11h 45m
Icelandair
Wed 9/97:25 pm
ORD
-
LGW
1 stop13h 15m
Icelandair
Deal found 7/29$662
This United Airlines deal was found by Cheapflights users on 7/29. 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 9/98:40 am
LHR
-
ORD
1 stop13h 15m
United Airlines
Wed 9/96:15 pm
ORD
-
LHR
1 stop10h 25m
United Airlines
Deal found 7/29$662
This Gotogate deal was found by Cheapflights users on 7/29. 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 9/91:05 pm
LHR
-
ORD
1 stop14h 20m
Icelandair
Sat 9/1210:25 pm
ORD
-
LHR
1 stop31h 30m
Icelandair
Deal found 7/29$663
This Mytrip deal was found by Cheapflights users on 7/28. 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 9/116:40 am
STN
-
ORD
2 stops20h 45m
Multiple Airlines
Fri 9/187:25 pm
ORD
-
STN
2 stops19h 05m
Multiple Airlines
Deal found 7/28$663
This Kiwi.com deal was found by Cheapflights users on 7/28. 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.
Sat 11/2111:50 am
STN
-
ORD
1 stop12h 35m
Multiple Airlines
Sat 11/283:55 pm
ORD
-
STN
1 stop11h 40m
Multiple Airlines
Deal found 7/28$664
This TravelUp deal was found by Cheapflights users on 7/29. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/283:40 pm
LGW
-
ORD
1 stop11h 45m
Icelandair
Fri 9/187:25 pm
ORD
-
LGW
1 stop13h 15m
Icelandair
Deal found 7/29$665
This Booking.com deal was found by Cheapflights users on 7/28. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/239:25 pm
LHR
-
ORD
1 stop26h 50m
Icelandair
Mon 9/287:25 pm
ORD
-
LHR
1 stop10h 30m
Icelandair
Deal found 7/28$665

Find flight deals from London to Illinois

Keep the following information in mind while searching for London to Illinois flight deals. Data was last updated July 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$655
(Gotogate)

One-way from

$359
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$957

Good round-trip deal

$863 or less

Good one-way deal

$741 or less
Provider with most accurate pricing for London (LON)-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for London (LON)-Chicago (CHI) flights.
Search Deals
From London (LON) to Illinois
Search Deals
One-way flight from London (LON) to Illinois
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($149 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from London (LON) to Illinois.
Search Deals
Price to beat on a one-way flight from London (LON) to Illinois.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from London to Illinois 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 July 29, 2026.
Use the filters below to find and compare flights from London to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 9/9

8:40 am-3:55 pm

1 stop13h 15m

Chicago O'Hare Intl

Wed 9/9

6:15 pm-10:40 am

1 stop10h 25m

$662

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 12/2

12:15 pm-5:20 pm

1 stop11h 05m

Chicago O'Hare Intl

Thu 12/10

6:30 pm-10:50 am

1 stop10h 20m

$673

LondonChicago

LTN - ORD

LTNORD

London Luton

Mon 8/24

7:40 pm-6:15 pm

2 stops28h 35m

Chicago O'Hare Intl

Sun 9/6

7:25 pm-10:55 pm

2 stops21h 30m

$690

LondonChicago

LTN - ORD

LTNORD

London Luton

Wed 9/23

6:15 am-7:48 pm

3 stops19h 33m

Chicago O'Hare Intl

Wed 9/30

10:25 pm-10:15 pm

2 stops17h 50m

$691

LondonChicago

LTN - ORD

LTNORD

London Luton

Fri 9/4

6:20 am-2:00 pm

1 stop13h 40m

Chicago O'Hare Intl

Wed 9/9

9:00 pm-9:15 pm

1 stop18h 15m

$693

LondonChicago

LTN - ORD

LTNORD

London Luton

Tue 9/15

3:15 pm-6:15 pm

2 stops33h 00m

Chicago O'Hare Intl

Wed 9/23

10:25 pm-10:15 pm

2 stops17h 50m

$695

LondonChicago

LGW - MDW

LGWMDW

London Gatwick

Mon 9/7

11:35 am-2:35 pm

2 stops33h 00m

Chicago Midway

Mon 9/14

3:20 pm-7:55 am

2 stops34h 35m

$698

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 9/2

3:40 pm-9:25 pm

1 stop11h 45m

Chicago O'Hare Intl

Sun 9/6

10:25 pm-2:40 pm

1 stop10h 15m

$715

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 11/25

9:05 pm-4:45 pm

2 stops25h 40m

Chicago O'Hare Intl

Sun 12/6

7:15 pm-4:00 pm

1 stop14h 45m

$733

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 9/11

1:05 pm-6:15 pm

1 stop11h 10m

Chicago O'Hare Intl

Fri 10/2

7:25 pm-8:20 pm

1 stop18h 55m

$753

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

Showing 1-10 of 60 resultsSorted by cheapest first
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6

Best time to book a flight from London to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from London 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 London to Illinois

What is the cheapest month to book a flight from London to Illinois?

Currently, February is the cheapest month in which you can book a flight from London to Illinois (average of $615). Flying from London to Illinois in July is currently the most expensive (average of $1,020). 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 LON to IL?

Find hourly flight availability from London to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2026.

When flying from London to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from London to Illinois

Explore weekly flight availability from London to Illinois. 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 July 29, 2026.

The most flights from LON to USIL are scheduled on a Monday (52 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (49 on average).

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

Airfare is below average for this route at the moment.
London to Illinois flights typically cost between $726 and $1,145 in September.
The cheapest round-trip price found within the last 5 days was $655 on Icelandair (Sep 9-Sep 12).

How far ahead should I book a flight from London to Illinois?

Booking 62 days in advance of your planned departure date is, on average, the best time to get cheap flights from London to Illinois. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. 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 Illinois. Reviews last updated July 29, 2026.
See what other customers who have flown with United Airlines,American Airlines, andIcelandair from London to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
10,051 reviews

Boarding

7.7

Entertainment

7.1

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
United Airlines
7.4
Good
10,051 reviews
United Airlines
7.4
Good
10,051 reviews

Boarding

7.7

Entertainment

7.1

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
American Airlines
7.1
Good
11,841 reviews
United Airlines
7.4
Good
10,051 reviews

Boarding

7.7

Entertainment

7.1

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Icelandair
7.0
Good
716 reviews
United Airlines
7.4
Good
10,051 reviews

Boarding

7.7

Entertainment

7.1

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
Lufthansa
6.8
Okay
8,163 reviews
United Airlines
7.4
Good
10,051 reviews

Boarding

7.7

Entertainment

7.1

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.
British Airways
6.7
Okay
8,127 reviews
United Airlines
7.4
Good
10,051 reviews

Boarding

7.7

Entertainment

7.1

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

Related info for your journey

Find useful and relevant information for your journey from London to Illinois. 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 London to Illinois?

    There are many flights that can get you from London to Illinois in 11h 05m. Fly via United Airlines, Icelandair, or Scandinavian Airlines to get the fastest option. There are 3939 mi between London and Illinois. This flight may include one or multiple stops.

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

    To fly one-way, consider booking your trip with Icelandair, which is currently one of the cheapest options available, starting at $380. Aer Lingus flights start at $432 while deals on Lufthansa start at $496 one-way.

  • What are the most popular routes from London to Illinois?

    The most popular route from London to Illinois is London Heathrow - Chicago O'Hare Intl. You may also consider London Gatwick - Chicago O'Hare Intl or London City - Chicago O'Hare Intl.

  • What are the most reliable airlines from London to Illinois?

    Consider Air Canada (90%), Austrian Airlines (90%) or United Airlines (90%) when booking your flight. These represent the most reliable airlines when flying from London to Illinois.

  • What are the cheapest flights from London to Illinois?

    The cheapest flight price from London to Illinois is $554. On average you can expect to pay $2,669. The most popular route, (London Heathrow - Chicago O'Hare Intl), can usually be booked for $477.

  • Can I find deals for flights from London to Illinois that include hotel bookings?

    Yes. In addition to deals on London to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from London to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Illinois.

  • Can I find deals for business class flights from London to Illinois?

    Yes. Cheapflights offers flight deals from London to Illinois 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 London to Illinois?

    Currently, February is the cheapest month in which you can book a flight from London to Illinois (average of $615). Flying from London to Illinois in July is currently the most expensive (average of $1,020). 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

Browse thousands of different options on Cheapflights for your next trip

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Top 8 airlines flying from London to Illinois

Discover the top 8 airlines that operate flights from London to Illinois. 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 July 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$421Average$648FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$446Average$497FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$467Average$632FlexibilityNo cancel feeOn-time77%
Austrian AirlinesCheapest$530Average$931FlexibilityNo cancel feeOn-time78%
United AirlinesCheapest$572Average$930FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$574Average$857FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$583Average$931FlexibilityNo cancel feeOn-time71%
LufthansaCheapest$703Average$877FlexibilityNo cancel feeOn-time76%

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