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$406+ 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 6/25. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$557
(American Airlines)

One-way from

$406
(Mytrip)

Popular in

August

Cheapest in

February

Average price

$720

Good round-trip deal

$664 or less

Good one-way deal

$585 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. 12% potential increase in price ($102 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($18 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 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 June 12, 2025.

This American Airlines deal was found by Cheapflights users on 6/10. 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.
Mon 9/16:15 amLHR - ORD
1 stop14h 00mAmerican Airlines
Wed 9/171:59 pmORD - LHR
1 stop10h 21mAmerican Airlines
Deal found 6/10$557
This oojo deal was found by Cheapflights users on 6/10. 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.
Fri 10/246:40 pmLHR - ORD
1 stop27h 30mScandinavian Airlines
Mon 10/278:20 pmORD - LHR
1 stop14h 40mScandinavian Airlines
Deal found 6/10$558
This Netflights deal was found by Cheapflights users on 6/10. 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 9/99:50 amLHR - ORD
1 stop11h 55mBritish Airways
Sat 9/2010:20 pmORD - LHR
1 stop10h 35mBritish Airways
Deal found 6/10$559
This Mytrip deal was found by Cheapflights users on 6/12. 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.
Wed 9/101:30 pmLHR - ORD
1 stop12h 25mLufthansa
Sat 9/2010:30 pmORD - LHR
1 stop13h 10mLufthansa
Deal found 6/12$560
This KLM deal was found by Cheapflights users on 6/10. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/86:30 amLHR - ORD
1 stop14h 10mKLM
Wed 9/171:16 pmORD - LHR
1 stop11h 29mKLM
Deal found 6/10$561
This Delta deal was found by Cheapflights users on 6/12. 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.
Mon 9/88:40 amLHR - MDW
2 stops15h 57mDelta
Thu 9/1810:35 amMDW - LHR
1 stop14h 10mDelta
Deal found 6/12$562
This Delta deal was found by Cheapflights users on 6/10. 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.
Wed 8/2711:45 amLHR - ORD
2 stops16h 09mDelta
Wed 9/1010:15 amORD - LHR
1 stop14h 30mDelta
Deal found 6/10$564
This Finnair deal was found by Cheapflights users on 6/10. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/277:30 amLHR - ORD
1 stop16h 20mFinnair
Wed 9/1010:35 pmORD - LHR
Nonstop7h 40mFinnair
Deal found 6/10$565
This Virgin Atlantic deal was found by Cheapflights users on 6/11. 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.
Tue 9/236:15 amLHR - MDW
2 stops16h 08mVirgin Atlantic
Thu 10/210:35 amMDW - LHR
2 stops13h 45mVirgin Atlantic
Deal found 6/11$567
This oojo deal was found by Cheapflights users on 6/11. 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 9/138:00 amLHR - ORD
1 stop14h 30mTAP AIR PORTUGAL
Sat 9/206:15 pmORD - LHR
1 stop12h 30mTAP AIR PORTUGAL
Deal found 6/11$568
This TravelUp deal was found by Cheapflights users on 6/10. 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 9/98:40 amLHR - ORD
1 stop11h 30mVirgin Atlantic
Sat 9/202:10 pmORD - LHR
1 stop10h 35mVirgin Atlantic
Deal found 6/10$571
This TravelUp deal was found by Cheapflights users on 6/10. 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.
Thu 9/48:40 amLHR - MDW
2 stops15h 57mKLM
Thu 9/1110:35 amMDW - LHR
1 stop14h 10mKLM
Deal found 6/10$578

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 June 12, 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

Mon 9/1

6:15 am-2:15 pm

1 stop14h 00m

Chicago O'Hare Intl

Mon 9/22

1:59 pm-6:20 am

1 stop10h 21m

$557

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 9/9

9:50 am-3:45 pm

1 stop11h 55m

Chicago O'Hare Intl

Sat 9/20

10:20 pm-2:55 pm

1 stop10h 35m

$559

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 9/10

1:30 pm-7:55 pm

1 stop12h 25m

Chicago O'Hare Intl

Sat 9/20

10:30 pm-5:40 pm

1 stop13h 10m

$560

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 9/8

6:30 am-2:40 pm

1 stop14h 10m

Chicago O'Hare Intl

Wed 9/17

1:16 pm-6:45 am

1 stop11h 29m

$561

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Mon 9/8

8:40 am-6:37 pm

2 stops15h 57m

Chicago Midway

Thu 9/18

10:35 am-6:45 am

1 stop14h 10m

$562

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 8/27

9:30 am-5:50 pm

1 stop14h 20m

Chicago O'Hare Intl

Wed 9/10

10:35 pm-12:15 pm

Nonstop7h 40m

$563

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 8/27

11:45 am-9:54 pm

2 stops16h 09m

Chicago O'Hare Intl

Wed 9/10

10:15 am-6:45 am

1 stop14h 30m

$564

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Tue 9/23

6:15 am-4:23 pm

2 stops16h 08m

Chicago Midway

Thu 10/2

10:35 am-6:20 am

2 stops13h 45m

$567

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 9/3

6:45 pm-12:35 pm

1 stop23h 50m

Chicago O'Hare Intl

Sat 9/13

6:15 pm-12:45 pm

1 stop12h 30m

$569

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 9/9

8:40 am-2:10 pm

1 stop11h 30m

Chicago O'Hare Intl

Sat 9/20

2:10 pm-6:45 am

1 stop10h 35m

$571

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 54 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 June 12, 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 June 12, 2025.

The most flights from LHR to USIL are scheduled on a Monday (53 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (48 on average).

Rainfall in Illinois by month

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

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

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

If weather is an important factor for your trip to Illinois, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 June 12, 2025.
To help decide which airline to fly from London to Illinois, see what other customers have to say about Delta, KLM and Austrian Airlines. 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.
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

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
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

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
1,358 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

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
802 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

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
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

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!
Air France
7.5
Good
1,463 reviews
Delta
8.0
Very good
7,950 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Overall

8.0

Crew

8.5

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 Heathrow to Illinois. 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 London Heathrow Airport to Illinois one-way?

    The cheapest airlines for a one-way flight from London Heathrow Airport to Illinois are Aer Lingus ($518), TAP AIR PORTUGAL ($544), and British Airways ($563).

  • 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 (92%), Austrian Airlines (92%) or United Airlines (92%) 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 $2,749, our data indicates the cheapest price to be $525. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around $441.

  • 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.

See more FAQs

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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
Heathrow to LaGuardia flights
London City to John F Kennedy Intl flights
Gatwick to Newark flights
Gatwick to John F Kennedy Intl flights
Gatwick to LaGuardia flights
London City to Newark flights
Stansted to John F Kennedy Intl flights
Heathrow to Los Angeles flights
Heathrow to Boston flights
Luton to John F Kennedy Intl flights
Gatwick to Boston flights
Heathrow to O'Hare Intl flights
Heathrow to Orlando flights
Heathrow to Miami flights
Heathrow to Seattle flights
Heathrow to San Francisco flights
Heathrow to Dulles Intl flights
Heathrow to Dallas/Fort Worth flights
London City to Boston flights
Heathrow to Las Vegas flights
Heathrow to Baltimore flights
Stansted to Newark flights
London City to Los Angeles flights
Gatwick to Stewart flights
Heathrow to Atlanta flights
Gatwick to Orlando flights
Luton to Stewart flights
Heathrow to Hobby flights
Gatwick to O'Hare Intl flights
Gatwick to Miami flights
London City to Miami flights
Heathrow to Tampa flights
Gatwick to Los Angeles flights
Luton to Newark flights
London City to O'Hare Intl flights
Heathrow to Philadelphia flights
Heathrow to Raleigh flights
Gatwick to San Francisco flights
Heathrow to Ontario flights
Heathrow to Midway flights
Heathrow to Denver flights
Stansted to Boston flights
London City to San Francisco flights
Heathrow to George Bush Intcntl flights
Gatwick to Dulles Intl 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$451Average$569FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$462Average$569FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$483Average$776FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$538Average$821FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$551Average$766FlexibilityNo cancel feeOn-time70%
Aer LingusCheapest$568Average$713FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$582Average$776FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$583Average$794FlexibilityNo cancel feeOn-time71%
Austrian AirlinesCheapest$586Average$987FlexibilityNo cancel feeOn-time78%
FinnairCheapest$607Average$809FlexibilityNo cancel feeOn-time76%

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