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$437+ 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 1/8. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ORD
Dec 26 — Jan 21
Fri 12/26
Fri 1/2
1 adult, Economy
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Cheap flight deals from London to Illinois

Keep the following information in mind while searching for London to Illinois flight deals. Data was last updated November 26, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$559
(Mytrip)

One-way from

$437
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$629

Good round-trip deal

$753 or less

Good one-way deal

$650 or less
Provider with most accurate pricing for London (LON)-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for London (LON)-Chicago (CHI) flights.
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From London (LON) to Illinois
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One-way flight from London (LON) to Illinois
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Highest demand for flights based on searches. 13% potential increase in price ($105 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($16 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from London (LON) to Illinois.
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Price to beat on a one-way flight from London (LON) to Illinois.
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Find 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 November 26, 2025.

This Mytrip deal was found by Cheapflights users on 11/24. 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.
Tue 12/28:50 amLGW - ORD
2 stops35h 30mMultiple Airlines
Tue 12/95:20 pmORD - LGW
2 stops21h 45mMultiple Airlines
Deal found 11/24$559
This Netflights deal was found by Cheapflights users on 11/23. 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 Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/912:15 pmLHR - ORD
1 stop11h 05mIcelandair
Tue 12/166:30 pmORD - LHR
1 stop19h 00mIcelandair
Deal found 11/23$564
This Mytrip deal was found by Cheapflights users on 11/24. 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.
Tue 12/28:30 amSTN - ORD
2 stops35h 50mMultiple Airlines
Tue 12/95:20 pmORD - STN
2 stops22h 00mMultiple Airlines
Deal found 11/24$564
This Mytrip deal was found by Cheapflights users on 11/23. 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.
Tue 12/99:00 amLTN - ORD
2 stops14h 20mMultiple Airlines
Tue 12/166:30 pmORD - LTN
2 stops19h 35mMultiple Airlines
Deal found 11/23$572
This TravelUp deal was found by Cheapflights users on 11/25. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/212:10 pmLHR - ORD
1 stop11h 45mBritish Airways
Mon 12/86:35 pmORD - LHR
Nonstop7h 40mBritish Airways
Deal found 11/25$576
This Gotogate deal was found by Cheapflights users on 11/24. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/168:35 pmLHR - ORD
1 stop26h 45mIcelandair
Tue 1/66:30 pmORD - LHR
1 stop10h 20mIcelandair
Deal found 11/24$578
This Gotogate deal was found by Cheapflights users on 11/24. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/411:55 amLGW - ORD
1 stop11h 25mIcelandair
Tue 12/96:30 pmORD - LGW
1 stop10h 25mIcelandair
Deal found 11/24$579
This Gotogate deal was found by Cheapflights users on 11/25. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/511:55 amLGW - ORD
1 stop11h 25mIcelandair
Mon 12/86:30 pmORD - LGW
1 stop10h 25mIcelandair
Deal found 11/25$580
This Netflights deal was found by Cheapflights users on 11/24. 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 Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/46:30 amLHR - ORD
1 stop13h 30mBritish Airways
Tue 12/96:35 pmORD - LHR
Nonstop7h 40mBritish Airways
Deal found 11/24$580
This Gotogate deal was found by Cheapflights users on 11/24. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/412:15 pmLHR - ORD
1 stop11h 05mIcelandair
Tue 12/96:30 pmORD - LHR
1 stop10h 20mIcelandair
Deal found 11/24$582
This Gotogate deal was found by Cheapflights users on 11/26. 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.
Sat 12/611:55 amLGW - ORD
1 stop11h 25mIcelandair
Tue 12/96:30 pmORD - LGW
1 stop10h 25mIcelandair
Deal found 11/26$583
This Gotogate deal was found by Cheapflights users on 11/26. 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.
Sat 12/67:50 amLHR - ORD
1 stop12h 10mAer Lingus
Wed 12/173:50 pmORD - LHR
1 stop10h 15mAer Lingus
Deal found 11/26$583

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 November 26, 2025.
Use the filters below to find and compare flights from London to Illinois that are best for you.

Fly from

London

Fly to

Illinois

Route

Depart

Return

Price

LondonChicago

LTN - ORD

LTNORD

London Luton

Sat 2/7

9:00 pm-4:55 pm

2 stops25h 55m

Chicago O'Hare Intl

Sun 2/15

7:10 pm-10:00 pm

2 stops20h 50m

$569

LondonChicago

LTN - ORD

LTNORD

London Luton

Mon 1/12

8:50 am-5:20 pm

2 stops14h 30m

Chicago O'Hare Intl

Fri 1/16

6:30 pm-8:10 pm

2 stops19h 40m

$580

LondonChicago

STN - ORD

STNORD

London Stansted

Mon 1/26

11:30 am-7:15 pm

1 stop13h 45m

Chicago O'Hare Intl

Fri 1/30

9:00 pm-4:35 pm

1 stop13h 35m

$595

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 4/29

6:40 am-4:10 pm

1 stop15h 30m

Chicago O'Hare Intl

Thu 5/21

7:15 pm-4:00 pm

1 stop14h 45m

$608

LondonChicago

STN - ORD

STNORD

London Stansted

Thu 12/18

6:30 am-5:20 pm

2 stops16h 50m

Chicago O'Hare Intl

Tue 1/6

6:30 pm-9:20 pm

2 stops20h 50m

$608

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 2/4

11:20 am-4:21 pm

1 stop35h 01m

Chicago O'Hare Intl

Sun 2/8

6:00 pm-7:30 am

1 stop31h 30m

$612

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 5/7

9:05 pm-4:10 pm

2 stops25h 05m

Chicago O'Hare Intl

Tue 5/12

7:30 am-9:35 am

2 stops20h 05m

$615

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 1/19

12:35 pm-3:25 pm

Nonstop8h 50m

Chicago O'Hare Intl

Mon 2/2

5:10 pm-6:55 am

Nonstop7h 45m

$644

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 1/19

11:10 am-6:25 pm

1 stop13h 15m

Chicago O'Hare Intl

Mon 2/2

10:35 am-7:10 am

1 stop14h 35m

$646

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 12/6

6:30 am-2:00 pm

1 stop13h 30m

Chicago O'Hare Intl

Tue 12/9

4:52 pm-9:30 am

1 stop10h 38m

$649

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/24

Showing 1-10 of 60 results
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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, March is the cheapest month in which you can book a flight from London to Illinois (average of $404). Flying from London to Illinois in July is currently the most expensive (average of $672). 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 November 26, 2025.

It’s optimal to fly from London to Illinois in the evening. By choosing this option you can save up to 40% on the cost of your flight, compared to a flight in the afternoon.

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 November 26, 2025.

The most flights from LON to USIL are scheduled on a Monday (42 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (22 on average).

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

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 November 26, 2025.
See what other customers who have flown with Austrian Airlines, United Airlines, and American Airlines 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.
Austrian Airlines
7.6
Good
874 reviews

Overall

7.6

Boarding

7.6

Food

6.8

Entertainment

6.8

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
Austrian Airlines
7.6
Good
874 reviews
Austrian Airlines
7.6
Good
874 reviews

Overall

7.6

Boarding

7.6

Food

6.8

Entertainment

6.8

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
United Airlines
7.4
Good
9,050 reviews
Austrian Airlines
7.6
Good
874 reviews

Overall

7.6

Boarding

7.6

Food

6.8

Entertainment

6.8

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
American Airlines
7.2
Good
11,037 reviews
Austrian Airlines
7.6
Good
874 reviews

Overall

7.6

Boarding

7.6

Food

6.8

Entertainment

6.8

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
Icelandair
7.0
Good
582 reviews
Austrian Airlines
7.6
Good
874 reviews

Overall

7.6

Boarding

7.6

Food

6.8

Entertainment

6.8

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
British Airways
6.7
Okay
7,539 reviews
Austrian Airlines
7.6
Good
874 reviews

Overall

7.6

Boarding

7.6

Food

6.8

Entertainment

6.8

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.

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 8h 50m. Fly via Scandinavian Airlines, British Airways, or Finnair 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 Air Canada, which is currently one of the cheapest options available, starting at $531. British Airways flights start at $536 while deals on United Airlines start at $537 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 (86%), Austrian Airlines (86%) or United Airlines (86%) 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 $530. On average you can expect to pay $1,524. The most popular route, (London Heathrow - Chicago O'Hare Intl), can usually be booked for $491.

  • 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, March is the cheapest month in which you can book a flight from London to Illinois (average of $404). Flying from London to Illinois in July is currently the most expensive (average of $672). 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

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Alternative routes for London to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to John F Kennedy Intl flights
Heathrow to Newark flights
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Edinburgh to Newark flights
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Heathrow to Ontario flights
London City to Dulles Intl flights
Heathrow to George Bush Intcntl flights

Top 10 airlines flying from London to Illinois

Discover the top 10 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 November 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$390Average$543FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$446Average$650FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$485Average$647FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$530Average$943FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$552Average$769FlexibilityNo cancel feeOn-time70%
TAP AIR PORTUGALCheapest$558Average$789FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$572Average$815FlexibilityNo cancel feeOn-time71%
IberiaCheapest$599Average$797FlexibilityNo cancel feeOn-time77%
FinnairCheapest$625Average$809FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$720Average$830FlexibilityNo cancel feeOn-time76%

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