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$511+ Cheap flights from Heathrow (LHR) 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 3/14. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
Nov 15 — Nov 221
Sat 11/15
Sat 11/22
1 adult, Economy
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Cheap flight deals from Heathrow to Illinois

Keep the following information in mind while searching for Heathrow to Illinois flight deals. Data was last updated October 16, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$532
(Cheapflightsfares)

One-way from

$511
(British Airways)

Popular in

July

Cheapest in

February

Average price

$720

Good round-trip deal

$581 or less

Good one-way deal

$586 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 Heathrow to Illinois
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One-way flight from London Heathrow to Illinois
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Highest demand for flights based on searches. 13% potential increase in price ($111 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from London Heathrow to Illinois.
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Price to beat on a one-way flight from London Heathrow to Illinois.
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Find flight deals from Heathrow to Illinois

Cheapest flights from Heathrow to Illinois
Explore the most affordable flight options available from Heathrow to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 16, 2025.

This The Travel House deal was found by Cheapflights users on 10/15. 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.
Wed 11/127:30 pmLHR - ORD
1 stop27h 15mScandinavian Airlines
Wed 11/197:20 pmORD - LHR
1 stop16h 20mScandinavian Airlines
Deal found 10/15$533
This Cheapflightsfares deal was found by Cheapflights users on 10/15. 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 11/187:50 pmLHR - ORD
2 stops26h 55mScandinavian Airlines
Thu 11/277:20 pmORD - LHR
1 stop16h 20mScandinavian Airlines
Deal found 10/15$534
This The Travel House deal was found by Cheapflights users on 10/16. 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.
Fri 10/3110:20 amLHR - ORD
1 stop12h 25mScandinavian Airlines
Fri 11/77:20 pmORD - LHR
1 stop14h 40mScandinavian Airlines
Deal found 10/16$535
This The Travel House deal was found by Cheapflights users on 10/15. 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.
Mon 11/37:05 amLHR - ORD
2 stops15h 40mScandinavian Airlines
Sat 11/87:20 pmORD - LHR
1 stop20h 20mScandinavian Airlines
Deal found 10/15$537
This The Travel House deal was found by Cheapflights users on 10/16. 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 11/16:40 amLHR - ORD
2 stops40h 05mScandinavian Airlines
Sat 11/227:20 pmORD - LHR
1 stop16h 20mScandinavian Airlines
Deal found 10/16$538
This oojo deal was found by Cheapflights users on 10/15. 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.
Sat 11/16:40 amLHR - ORD
1 stop16h 05mScandinavian Airlines
Wed 11/57:20 pmORD - LHR
2 stops17h 30mScandinavian Airlines
Deal found 10/15$540
This The Travel House deal was found by Cheapflights users on 10/15. 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.
Fri 11/73:35 pmLHR - ORD
2 stops31h 10mScandinavian Airlines
Fri 11/287:20 pmORD - LHR
2 stops39h 05mScandinavian Airlines
Deal found 10/15$541
This The Travel House deal was found by Cheapflights users on 10/15. 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 11/86:40 amLHR - ORD
1 stop16h 05mScandinavian Airlines
Sat 11/157:20 pmORD - LHR
2 stops18h 35mScandinavian Airlines
Deal found 10/15$542
This Mytrip deal was found by Cheapflights users on 10/15. 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.
Mon 11/176:40 amLHR - ORD
1 stop16h 05mScandinavian Airlines
Mon 12/17:20 pmORD - LHR
2 stops15h 05mScandinavian Airlines
Deal found 10/15$543
This The Travel House deal was found by Cheapflights users on 10/16. 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.
Sun 11/26:40 pmLHR - ORD
1 stop28h 05mScandinavian Airlines
Fri 11/77:20 pmORD - LHR
2 stops17h 10mScandinavian Airlines
Deal found 10/16$544
This Trip.com deal was found by Cheapflights users on 10/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1312:15 pmLHR - MDW
2 stops17h 40mMultiple Airlines
Thu 11/206:20 amMDW - LHR
2 stops31h 10mMultiple Airlines
Deal found 10/16$622
This Netflights deal was found by Cheapflights users on 10/14. 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 Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2511:45 amLHR - MDW
2 stops17h 55mVirgin Atlantic
Wed 12/39:34 amMDW - LHR
2 stops16h 16mVirgin Atlantic
Deal found 10/14$663

Cheapflights Fare Finder

 
Customize your flight search to find flights from Heathrow 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 October 16, 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Illinois that are best for you.

Fly from

Heathrow

Fly to

Illinois

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 11/21

10:20 am-4:45 pm

1 stop12h 25m

Chicago O'Hare Intl

Fri 11/28

7:20 pm-4:00 pm

1 stop14h 40m

$546

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 11/6

6:40 pm-4:45 pm

1 stop28h 05m

Chicago O'Hare Intl

Thu 11/13

7:20 pm-9:40 pm

1 stop20h 20m

$549

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 11/12

7:30 pm-4:45 pm

1 stop27h 15m

Chicago O'Hare Intl

Sun 11/23

7:20 pm-4:00 pm

1 stop14h 40m

$549

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 11/12

6:40 pm-4:45 pm

1 stop28h 05m

Chicago O'Hare Intl

Wed 11/26

7:20 pm-4:00 pm

1 stop14h 40m

$549

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 11/14

10:20 am-4:45 pm

1 stop12h 25m

Chicago O'Hare Intl

Fri 11/28

7:20 pm-4:00 pm

1 stop14h 40m

$549

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 11/13

1:45 pm-4:20 pm

1 stop32h 35m

Chicago O'Hare Intl

Sat 11/15

3:55 pm-6:30 am

1 stop32h 35m

$552

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 11/6

5:30 pm-4:45 pm

2 stops29h 15m

Chicago O'Hare Intl

Fri 11/14

7:20 pm-4:00 pm

1 stop14h 40m

$553

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 11/15

10:20 am-4:45 pm

1 stop12h 25m

Chicago O'Hare Intl

Mon 11/24

7:20 pm-4:25 pm

2 stops15h 05m

$553

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 11/6

5:30 pm-4:45 pm

2 stops29h 15m

Chicago O'Hare Intl

Sun 11/16

7:20 pm-4:25 pm

2 stops15h 05m

$557

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 11/10

7:05 am-4:45 pm

2 stops15h 40m

Chicago O'Hare Intl

Mon 11/24

7:20 pm-6:50 pm

2 stops17h 30m

$562

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/15

Showing 1-10 of 60 results
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Best time to book a flight from Heathrow to Illinois

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

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

Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to Illinois (average of $478). Flying from London Heathrow Airport to Illinois in July is currently the most expensive (average of $673). 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 LHR to IL?

Find hourly flight availability from Heathrow 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 October 16, 2025.

When flying from London Heathrow Airport to Illinois, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 50% versus a flight in the morning.

Weekly flight availability from London Heathrow Airport to Illinois

Explore weekly flight availability from Heathrow 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 October 16, 2025.

The most flights from LHR to USIL are scheduled on a Monday (47 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (47 on average).

How much does it cost to fly round-trip from London Heathrow Airport 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 October 16, 2025.
Read reviews from past customers who have flown United Airlines, American Airlines, and Aer Lingus from London Heathrow Airport to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,980 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

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
8,980 reviews
United Airlines
7.4
Good
8,980 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

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
7.2
Good
11,042 reviews
United Airlines
7.4
Good
8,980 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

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.
Aer Lingus
7.2
Good
1,341 reviews
United Airlines
7.4
Good
8,980 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

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
556 reviews
United Airlines
7.4
Good
8,980 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

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
7,456 reviews
United Airlines
7.4
Good
8,980 reviews

Comfort

7.3

Boarding

7.7

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

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 Heathrow 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 Heathrow Airport to Illinois?

    Scandinavian Airlines, Delta, and Virgin Atlantic can get you from London Heathrow Airport to Illinois in just under 12h 25m. Your travel time can differ by up to 5h 30m. The distance between London Heathrow Airport and Illinois is about 3939 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    The cheapest airlines for a one-way flight from London Heathrow Airport to Illinois are British Airways ($511), Aer Lingus ($520), and Delta ($524).

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

    The most popular flight routes from London Heathrow Airport to Illinois are London Heathrow - Chicago O'Hare Intl, London Heathrow - Chicago Midway and London Heathrow - Lambert-St Louis.

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

    No one likes to see their flight delayed. When booking a flight from London Heathrow Airport to Illinois consider choosing Air Canada (84%), Austrian Airlines (84%) or United Airlines (84%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from London Heathrow Airport to Illinois?

    Looking for the cheapest flight from London Heathrow Airport to Illinois? While on average our users pay $1,533, our data indicates the cheapest price to be $532. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around $504.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Heathrow 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 Heathrow Airport to Illinois?

    Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to Illinois (average of $478). Flying from London Heathrow Airport to Illinois in July is currently the most expensive (average of $673). 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.

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Alternative routes for Heathrow to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Heathrow to Illinois

Discover the top 10 airlines that operate flights from Heathrow 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 October 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$451Average$565FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$453Average$683FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$485Average$729FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$530Average$943FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$554Average$767FlexibilityNo cancel feeOn-time70%
TAP AIR PORTUGALCheapest$558Average$789FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$572Average$799FlexibilityNo cancel feeOn-time71%
IberiaCheapest$599Average$793FlexibilityNo cancel feeOn-time77%
FinnairCheapest$626Average$852FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$660Average$795FlexibilityNo cancel feeOn-time76%

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