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$440+ 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 4/22. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
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 March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$539
(United Airlines)

One-way from

$440
(Kiwi.com)

Popular in

August

Cheapest in

February

Average price

$640

Good round-trip deal

$685 or less

Good one-way deal

$660 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. 12% potential increase in price ($99 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 March 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 March 28, 2025.

This United Airlines deal was found by Cheapflights users on 3/27. 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.
Sat 5/107:25 amLHR - ORD
1 stop12h 30mUnited Airlines
Wed 5/144:25 pmORD - LHR
1 stop12h 15mUnited Airlines
Deal found 3/27$539
This Austrian Airlines deal was found by Cheapflights users on 3/28. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/59:05 amLHR - ORD
1 stop34h 15mAustrian Airlines
Tue 9/164:00 pmORD - LHR
Nonstop8h 20mAustrian Airlines
Deal found 3/28$540
This Cheapflightsfares deal was found by Cheapflights users on 3/27. 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.
Sat 4/267:40 amLHR - ORD
1 stop12h 20mBritish Airways
Tue 4/298:20 pmORD - LHR
Nonstop8h 10mBritish Airways
Deal found 3/27$544
This Lufthansa deal was found by Cheapflights users on 3/27. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/197:30 amLHR - ORD
2 stops16h 56mLufthansa
Wed 5/142:35 pmORD - LHR
1 stop13h 05mLufthansa
Deal found 3/27$546
This Gotogate deal was found by Cheapflights users on 3/27. 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 6/41:05 pmLHR - ORD
1 stop11h 10mIcelandair
Wed 6/2510:15 pmORD - LHR
1 stop16h 05mIcelandair
Deal found 3/27$548
This Flysmarter deal was found by Cheapflights users on 3/28. 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 Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/196:30 amLHR - ORD
1 stop14h 15mMultiple Airlines
Fri 5/212:00 pmORD - LHR
1 stop12h 35mMultiple Airlines
Deal found 3/28$553
This TravelUp deal was found by Cheapflights users on 3/26. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/106:30 amLHR - MDW
2 stops15h 51mKLM
Sat 5/176:30 pmMDW - LHR
1 stop12h 40mKLM
Deal found 3/26$559
This Flysmarter deal was found by Cheapflights users on 3/28. 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 Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/199:30 amLHR - ORD
2 stops16h 00mAir Canada
Fri 5/210:40 amORD - LHR
1 stop13h 50mAir Canada
Deal found 3/28$560
This TravelUp deal was found by Cheapflights users on 3/27. 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.
Sat 4/2611:45 amLHR - MDW
1 stop12h 35mVirgin Atlantic
Sat 5/34:00 pmMDW - LHR
1 stop13h 10mVirgin Atlantic
Deal found 3/27$566
This SWISS deal was found by Cheapflights users on 3/27. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/236:00 amLHR - ORD
1 stop12h 45mSWISS
Tue 5/63:45 pmORD - LHR
2 stops18h 50mSWISS
Deal found 3/27$568
This TravelUp deal was found by Cheapflights users on 3/27. 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.
Mon 4/289:20 amLHR - MDW
1 stop12h 52mAir France
Tue 5/63:02 pmMDW - LHR
1 stop11h 53mAir France
Deal found 3/27$571
This Delta deal was found by Cheapflights users on 3/27. 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.
Sat 4/198:40 amLHR - ORD
2 stops17h 30mDelta
Fri 5/210:30 amORD - LHR
1 stop16h 25mDelta
Deal found 3/27$580

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 March 28, 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

Sat 5/10

7:25 am-1:55 pm

1 stop12h 30m

Chicago O'Hare Intl

Wed 5/14

4:25 pm-10:40 am

1 stop12h 15m

$539

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 4/26

7:40 am-2:00 pm

1 stop12h 20m

Chicago O'Hare Intl

Tue 4/29

8:20 pm-10:30 am

Nonstop8h 10m

$544

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 4/19

7:30 am-6:26 pm

2 stops16h 56m

Chicago O'Hare Intl

Wed 5/14

2:35 pm-9:40 am

1 stop13h 05m

$546

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 6/4

1:05 pm-6:15 pm

1 stop11h 10m

Chicago O'Hare Intl

Wed 6/25

10:15 pm-8:20 pm

1 stop16h 05m

$548

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 4/19

6:30 am-2:45 pm

1 stop14h 15m

Chicago O'Hare Intl

Fri 5/2

12:00 pm-6:35 am

1 stop12h 35m

$553

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 4/26

8:30 am-11:35 am

Nonstop9h 05m

Chicago O'Hare Intl

Tue 4/29

9:20 pm-11:45 am

Nonstop8h 25m

$554

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Sat 5/10

6:30 am-4:21 pm

2 stops15h 51m

Chicago Midway

Sat 5/17

6:30 pm-1:10 pm

1 stop12h 40m

$559

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 4/19

9:30 am-7:30 pm

2 stops16h 00m

Chicago O'Hare Intl

Fri 5/2

10:40 am-6:30 am

1 stop13h 50m

$560

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Sat 4/26

11:45 am-6:20 pm

1 stop12h 35m

Chicago Midway

Sat 5/3

4:00 pm-11:10 am

1 stop13h 10m

$566

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 4/23

6:00 am-12:45 pm

1 stop12h 45m

Chicago O'Hare Intl

Tue 5/6

3:45 pm-4:35 pm

2 stops18h 50m

$568

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 57 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 $323). 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 March 28, 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.

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 March 28, 2025.
To help decide which airline to fly from London to Illinois, see what other customers have to say about Delta, KLM and Finnair. 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
7,896 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,896 reviews
Delta
8.0
Very good
7,896 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,321 reviews
Delta
8.0
Very good
7,896 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Finnair
7.6
Good
1,267 reviews
Delta
8.0
Very good
7,896 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Austrian Airlines
7.5
Good
769 reviews
Delta
8.0
Very good
7,896 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
SWISS
7.5
Good
1,570 reviews
Delta
8.0
Very good
7,896 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

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 TAP AIR PORTUGAL ($460), Icelandair ($517), and Aer Lingus ($520).

  • 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 $2,299, our data indicates the cheapest price to be $549. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around $442.

  • 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 $323). 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.
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Heathrow to Newark flights
Gatwick to John F Kennedy Intl flights
London City to John F Kennedy Intl flights
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Gatwick to Newark flights
London City to Newark flights
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Heathrow to Orlando flights
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Heathrow to O'Hare Intl flights
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Gatwick to Boston flights
London City to Los Angeles flights
Heathrow to Hobby flights
Gatwick to Orlando flights
London City to Miami flights
Heathrow to Seattle flights
Heathrow to Atlanta flights
Luton to Stewart flights
Gatwick to Los Angeles flights
Gatwick to Miami flights
Luton to Newark flights
London City to Boston flights
Gatwick to San Francisco flights
Heathrow to George Bush Intcntl flights
London City to San Francisco flights
Gatwick to Las Vegas flights
Luton to Los Angeles flights
Stansted to Boston flights
Gatwick to Stewart flights
Heathrow to Ontario flights
Heathrow to Denver flights
Stansted to Miami flights
Heathrow to Philadelphia flights
Gatwick to Dulles Intl flights
London City to Las Vegas flights
Heathrow to Nashville 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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$451Average$587FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$483Average$729FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$492Average$675FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$562Average$788FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$562Average$848FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$573Average$804FlexibilityNo cancel feeOn-time70%
Aer LingusCheapest$574Average$739FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$582Average$777FlexibilityNo cancel feeOn-time77%
FinnairCheapest$613Average$838FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$660Average$1,067FlexibilityNo cancel feeOn-time76%
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