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$560+ 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 12/17. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
Aug 26 — Sep 21
Tue 8/26
Tue 9/2
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 August 21, 2025.

Round-trip from

$571
(United Airlines)

One-way from

$560
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$843

Good round-trip deal

$666 or less

Good one-way deal

$661 or less
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 ($113 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 August 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 August 21, 2025.

This United Airlines deal was found by Cheapflights users on 8/21. 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 10/56:50 amLHR - ORD
1 stop11h 15mUnited Airlines
Sun 10/124:00 pmORD - LHR
Nonstop8h 20mUnited Airlines
Deal found 8/21$571
This United Airlines deal was found by Cheapflights users on 8/20. 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 9/171:30 pmLHR - ORD
1 stop12h 25mUnited Airlines
Tue 9/234:00 pmORD - LHR
Nonstop8h 20mUnited Airlines
Deal found 8/20$572
This United Airlines deal was found by Cheapflights users on 8/20. 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.
Thu 8/286:50 amLHR - ORD
1 stop11h 05mUnited Airlines
Wed 9/102:32 pmORD - LHR
1 stop10h 23mUnited Airlines
Deal found 8/20$573
This Icelandair deal was found by Cheapflights users on 8/20. 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.
Thu 8/289:25 pmLHR - ORD
1 stop26h 50mIcelandair
Thu 10/27:25 pmORD - LHR
1 stop18h 55mIcelandair
Deal found 8/20$574
This American Airlines deal was found by Cheapflights users on 8/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/197:40 amLHR - ORD
1 stop14h 05mAmerican Airlines
Fri 9/266:52 pmORD - LHR
1 stop11h 38mAmerican Airlines
Deal found 8/20$575
This United Airlines deal was found by Cheapflights users on 8/20. 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 9/179:30 amLHR - ORD
2 stops16h 18mUnited Airlines
Fri 9/269:20 pmORD - LHR
1 stop27h 35mUnited Airlines
Deal found 8/20$576
This Gotogate deal was found by Cheapflights users on 8/21. 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 8/279:25 pmLHR - ORD
1 stop26h 50mIcelandair
Sun 9/217:25 pmORD - LHR
1 stop10h 30mIcelandair
Deal found 8/21$577
This Air Canada deal was found by Cheapflights users on 8/20. 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.
Fri 8/296:50 amLHR - ORD
2 stops19h 26mAir Canada
Wed 10/19:55 amORD - LHR
2 stops14h 35mAir Canada
Deal found 8/20$578
This Expedia deal was found by Cheapflights users on 8/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/302:10 pmLHR - ORD
Nonstop8h 45mBrussels Airlines
Tue 9/304:00 pmORD - LHR
Nonstop8h 20mBrussels Airlines
Deal found 8/20$579
This Icelandair deal was found by Cheapflights users on 8/21. 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.
Wed 9/109:25 pmLHR - ORD
1 stop29h 50mIcelandair
Thu 9/187:25 pmORD - LHR
1 stop10h 30mIcelandair
Deal found 8/21$580
This Icelandair deal was found by Cheapflights users on 8/20. 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.
Wed 9/109:25 pmLHR - ORD
1 stop26h 50mIcelandair
Tue 9/167:25 pmORD - LHR
1 stop10h 30mIcelandair
Deal found 8/20$581
This Netflights deal was found by Cheapflights users on 8/21. 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 11/63:45 pmLHR - ORD
Nonstop9h 00mBritish Airways
Sun 11/96:45 pmORD - LHR
Nonstop7h 50mBritish Airways
Deal found 8/21$583

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 August 21, 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

Sun 10/5

6:50 am-12:05 pm

1 stop11h 15m

Chicago O'Hare Intl

Sun 10/12

4:00 pm-6:20 am

Nonstop8h 20m

$571

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 1/1

1:30 pm-8:05 pm

1 stop12h 35m

Chicago O'Hare Intl

Thu 1/15

9:05 pm-11:15 am

Nonstop8h 10m

$571

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 9/11

6:50 am-12:05 pm

1 stop11h 15m

Chicago O'Hare Intl

Mon 9/15

4:00 pm-6:20 am

Nonstop8h 20m

$571

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 9/25

8:30 am-2:55 pm

1 stop12h 25m

Chicago O'Hare Intl

Sun 10/5

4:00 pm-6:20 am

Nonstop8h 20m

$571

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 9/10

6:50 am-12:05 pm

1 stop11h 15m

Chicago O'Hare Intl

Wed 9/17

9:50 pm-11:45 am

Nonstop7h 55m

$571

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 9/3

6:50 am-12:05 pm

1 stop11h 15m

Chicago O'Hare Intl

Sat 9/13

1:12 pm-7:15 am

1 stop12h 03m

$571

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 9/17

8:30 am-2:55 pm

1 stop12h 25m

Chicago O'Hare Intl

Sun 9/21

4:00 pm-6:20 am

Nonstop8h 20m

$571

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 9/20

6:50 am-12:05 pm

1 stop11h 15m

Chicago O'Hare Intl

Sat 9/27

6:00 pm-8:20 am

Nonstop8h 20m

$572

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 9/26

6:50 am-12:05 pm

1 stop11h 15m

Chicago O'Hare Intl

Sat 10/4

8:40 am-6:30 am

1 stop15h 50m

$572

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Fri 12/5

11:05 am-6:07 pm

1 stop13h 02m

Chicago Midway

Tue 12/9

2:00 pm-7:05 am

1 stop11h 05m

$588

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/21

Showing 1-10 of 56 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, August is the cheapest month in which you can book a flight from London Heathrow Airport to Illinois (average of $245). Flying from London Heathrow Airport to Illinois in March is currently the most expensive (average of $321). 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 August 21, 2025.

When flying from London Heathrow Airport 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 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 August 21, 2025.

The most flights from LHR to USIL are scheduled on a Wednesday (53 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (46 on average).

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 August 21, 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
8,930 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Crew

8.1

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
United Airlines
7.4
Good
8,930 reviews
United Airlines
7.4
Good
8,930 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Crew

8.1

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,930 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Crew

8.1

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
Aer Lingus
7.1
Good
1,228 reviews
United Airlines
7.4
Good
8,930 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Crew

8.1

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
Iberia
7.0
Good
2,884 reviews
United Airlines
7.4
Good
8,930 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Crew

8.1

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
British Airways
6.7
Okay
7,291 reviews
United Airlines
7.4
Good
8,930 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Crew

8.1

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

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?

    United Airlines, Virgin Atlantic, and Scandinavian Airlines can get you from London Heathrow Airport to Illinois in just under 11h 15m. Your travel time can differ by up to 10h 05m. 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 TAP AIR PORTUGAL ($563), Aer Lingus ($565), and Lufthansa ($918).

  • 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 (73%), Austrian Airlines (73%) or United Airlines (73%) 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 $1,350, our data indicates the cheapest price to be $574. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around $470.

  • 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, August is the cheapest month in which you can book a flight from London Heathrow Airport to Illinois (average of $245). Flying from London Heathrow Airport to Illinois in March is currently the most expensive (average of $321). 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.
Heathrow to John F Kennedy Intl flights
Heathrow to Newark flights
Gatwick to Newark flights
London City to John F Kennedy Intl flights
Stansted to John F Kennedy Intl flights
Gatwick to John F Kennedy Intl flights
Stansted to Newark flights
London City to Newark flights
Luton to John F Kennedy Intl flights
Gatwick to LaGuardia flights
Heathrow to LaGuardia flights
Luton to Newark flights
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Heathrow to Orlando flights
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Heathrow to Miami flights
Heathrow to San Francisco flights
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Luton to LaGuardia flights
Heathrow to Dulles Intl flights
Heathrow to O'Hare Intl flights
Heathrow to Baltimore flights
Heathrow to Dallas/Fort Worth flights
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Gatwick to Orlando flights
Heathrow to Seattle flights
London City to Boston flights
London City to Los Angeles flights
Heathrow to Atlanta flights
Gatwick to San Francisco flights
Gatwick to Miami flights
Heathrow to Tampa flights
London City to Miami flights
Heathrow to Hobby flights
Gatwick to Los Angeles flights
London City to San Francisco flights
Stansted to Boston flights
Heathrow to Reagan-National flights
Heathrow to Denver flights
Gatwick to Dulles Intl flights
Gatwick to Baltimore flights
Gatwick to O'Hare Intl flights
Heathrow to George Bush Intcntl flights
Heathrow to Austin flights
London City to O'Hare Intl flights
Gatwick to Las Vegas flights
London City to Dulles Intl flights
Heathrow to Midway flights

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 August 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$451Average$565FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$462Average$568FlexibilityNo cancel feeOn-time77%
Aer LingusCheapest$484Average$693FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$485Average$748FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$552Average$778FlexibilityNo cancel feeOn-time70%
TAP AIR PORTUGALCheapest$558Average$789FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$582Average$793FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$583Average$797FlexibilityNo cancel feeOn-time71%
Austrian AirlinesCheapest$586Average$987FlexibilityNo cancel feeOn-time78%
FinnairCheapest$607Average$809FlexibilityNo cancel feeOn-time76%

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