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$412+ 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 2/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
Jan 26 — Feb 21
Sun 1/26
Sun 2/2
1 adult, Economy
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Cheap flight deals from Heathrow to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Illinois (USIL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 21, 2025.

Round-trip from

$532
(Gotogate)

One-way from

$412
(Kiwi.com)

Good round-trip deal

$736 or less

Good one-way deal

$667 or less
From London Heathrow to Illinois
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One-way flight from London Heathrow to Illinois
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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 January 21, 2025.

This Gotogate deal was found by Cheapflights users on 1/21. 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.
Thu 3/137:40 amLHR - ORD
1 stop12h 30mLufthansa
Thu 3/276:50 pmORD - LHR
Nonstop8h 05mLufthansa
Deal found 1/21$532
This Scandinavian Airlines deal was found by Cheapflights users on 1/21. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/197:50 pmLHR - ORD
2 stops28h 00mScandinavian Airlines
Sun 3/27:40 pmORD - LHR
1 stop16h 00mScandinavian Airlines
Deal found 1/21$533
This Gotogate deal was found by Cheapflights users on 1/21. 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.
Thu 3/207:25 pmLHR - ORD
1 stop24h 40mAustrian Airlines
Tue 3/256:50 pmORD - LHR
Nonstop8h 05mAustrian Airlines
Deal found 1/21$537
This United Airlines deal was found by Cheapflights users on 1/19. 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 2/169:30 amLHR - ORD
1 stop33h 55mUnited Airlines
Sun 2/238:02 pmORD - LHR
1 stop31h 38mUnited Airlines
Deal found 1/19$538
This Air Canada deal was found by Cheapflights users on 1/20. 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.
Wed 2/196:50 amLHR - ORD
2 stops13h 55mMultiple Airlines
Wed 2/2611:35 amORD - LHR
2 stops14h 55mMultiple Airlines
Deal found 1/20$539
This British Airways deal was found by Cheapflights users on 1/20. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/193:45 pmLHR - ORD
Nonstop9h 00mBritish Airways
Wed 2/269:45 pmORD - LHR
Nonstop7h 45mBritish Airways
Deal found 1/20$540
This American Airlines deal was found by Cheapflights users on 1/20. 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.
Mon 1/2711:55 amLHR - ORD
Nonstop8h 50mAmerican Airlines
Mon 2/106:35 pmORD - LHR
Nonstop7h 40mAmerican Airlines
Deal found 1/20$541
This TravelUp deal was found by Cheapflights users on 1/20. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/1912:20 pmLHR - MDW
1 stop11h 51mKLM
Wed 2/262:08 pmMDW - LHR
1 stop10h 42mKLM
Deal found 1/20$543
This Icelandair deal was found by Cheapflights users on 1/20. 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.
Sun 4/139:25 pmLHR - ORD
1 stop26h 55mIcelandair
Fri 4/2510:15 pmORD - LHR
1 stop16h 05mIcelandair
Deal found 1/20$548
This Delta deal was found by Cheapflights users on 1/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/278:40 amLHR - MDW
2 stops15h 34mDelta
Mon 2/102:08 pmMDW - LHR
1 stop10h 42mDelta
Deal found 1/20$549
This KLM deal was found by Cheapflights users on 1/20. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/16:30 amLHR - ORD
1 stop13h 40mKLM
Mon 9/222:00 pmORD - LHR
1 stop12h 05mKLM
Deal found 1/20$552
This SmartFares deal was found by Cheapflights users on 1/20. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/2712:20 pmLHR - MDW
1 stop11h 54mVirgin Atlantic
Mon 2/102:08 pmMDW - LHR
1 stop10h 42mVirgin Atlantic
Deal found 1/20$552

Find flights from Heathrow to Illinois within your budget

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 January 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 3/13

7:40 am-3:10 pm

1 stop12h 30m

Chicago O'Hare Intl

Thu 3/27

6:50 pm-7:55 am

Nonstop8h 05m

$532

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 2/19

7:50 pm-5:50 pm

2 stops28h 00m

Chicago O'Hare Intl

Sun 3/2

7:40 pm-5:40 pm

1 stop16h 00m

$533

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 3/20

7:25 pm-3:05 pm

1 stop24h 40m

Chicago O'Hare Intl

Tue 3/25

6:50 pm-7:55 am

Nonstop8h 05m

$537

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 2/16

9:30 am-1:25 pm

1 stop33h 55m

Chicago O'Hare Intl

Sun 2/23

8:02 pm-9:40 am

1 stop31h 38m

$538

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 2/19

6:50 am-2:45 pm

2 stops13h 55m

Chicago O'Hare Intl

Wed 2/26

11:35 am-8:30 am

2 stops14h 55m

$539

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 2/19

3:45 pm-6:45 pm

Nonstop9h 00m

Chicago O'Hare Intl

Wed 2/26

9:45 pm-11:30 am

Nonstop7h 45m

$540

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Wed 2/19

12:20 pm-6:11 pm

1 stop11h 51m

Chicago Midway

Wed 2/26

2:08 pm-6:50 am

1 stop10h 42m

$543

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 4/13

9:25 pm-6:20 pm

1 stop26h 55m

Chicago O'Hare Intl

Sat 4/26

7:30 pm-11:55 am

1 stop10h 25m

$548

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Mon 2/17

8:40 am-6:11 pm

2 stops15h 31m

Chicago Midway

Mon 2/24

12:44 pm-6:20 am

1 stop11h 36m

$549

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 2/3

10:00 am-9:15 pm

2 stops17h 15m

Chicago O'Hare Intl

Mon 2/17

2:59 pm-7:55 am

1 stop10h 56m

$553

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

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.

Travel insights for flights from Heathrow to Illinois

Get recent, data-driven insights about flights from Heathrow to Illinois including ideal travel times, pricing trends, and more.

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 $320). 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 January 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 January 21, 2025.

The most flights from LHR to USIL are scheduled on a Monday (36 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (30 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 January 21, 2025.
To help decide which airline to fly from London to Illinois, see what other customers have to say about Lufthansa, Scandinavian Airlines and United 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
8,521 reviews

Comfort

8.0

Food

7.3

Crew

8.6

Entertainment

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta
8.0
Very good
8,521 reviews
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Food

7.3

Crew

8.6

Entertainment

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM
7.8
Good
1,341 reviews
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Food

7.3

Crew

8.6

Entertainment

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Finnair
7.6
Good
1,286 reviews
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Food

7.3

Crew

8.6

Entertainment

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Austrian Airlines
7.6
Good
786 reviews
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Food

7.3

Crew

8.6

Entertainment

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

SWISS
7.5
Good
1,600 reviews
Delta
8.0
Very good
8,521 reviews

Comfort

8.0

Food

7.3

Crew

8.6

Entertainment

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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 Icelandair ($440), Aer Lingus ($442), and Virgin Atlantic ($509).

  • 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 (93%), Austrian Airlines (93%) or United Airlines (93%) 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 $1,362, our data indicates the cheapest price to be $578. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around $417.

  • 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 $320). 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 John F Kennedy Intl flights
London City to John F Kennedy Intl flights
Heathrow to LaGuardia flights
Gatwick to Newark flights
London City to Newark flights
Heathrow to Miami flights
Heathrow to Los Angeles flights
Heathrow to Orlando flights
Luton to John F Kennedy Intl flights
Heathrow to O'Hare Intl flights
Stansted to John F Kennedy Intl flights
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Heathrow to San Francisco flights
Luton to Newark flights
London City to Miami flights
Heathrow to Dulles Intl flights
Heathrow to Dallas/Fort Worth flights
Heathrow to Baltimore flights
Gatwick to Miami flights
Gatwick to Orlando flights
Stansted to Newark flights
Gatwick to Los Angeles flights
Heathrow to Seattle flights
London City to Los Angeles flights
Heathrow to Atlanta flights
Heathrow to Hobby flights
Gatwick to Stewart flights
Heathrow to Tampa flights
Gatwick to Boston flights
Heathrow to Ontario flights
Heathrow to Charlotte flights
Heathrow to Denver flights
Heathrow to Nashville flights
Heathrow to George Bush Intcntl flights
London City to New Orleans flights
Gatwick to New Orleans flights
Stansted to Miami flights
Gatwick to O'Hare Intl flights
Gatwick to San Francisco flights
Heathrow to Baton Rouge flights
London City to Boston flights
Luton to Stewart flights
London City to O'Hare 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 January 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$451Average$567FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$462Average$666FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$483Average$729FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$556Average$791FlexibilityNo cancel feeOn-time71%
FinnairCheapest$562Average$809FlexibilityNo cancel feeOn-time76%
IberiaCheapest$564Average$787FlexibilityNo cancel feeOn-time77%
Aer LingusCheapest$578Average$733FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$579Average$1,035FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$592Average$804FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$660Average$1,067FlexibilityNo cancel feeOn-time76%
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