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$386+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
1 adult, Economy
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Cheap 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 December 4, 2025.

This oojo deal was found by Cheapflights users on 12/3. 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.
Tue 12/238:35 pmLHR - ORD
1 stop26h 45mIcelandair
Thu 1/156:30 pmORD - LHR
1 stop19h 00mIcelandair
Deal found 12/3$626
This lastminute.com deal was found by Cheapflights users on 12/3. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/512:20 pmLHR - ORD
1 stop15h 32mJetBlue
Mon 1/126:45 amORD - LHR
1 stop18h 10mJetBlue
Deal found 12/3$634
This The Travel House deal was found by Cheapflights users on 12/3. 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 12/126:40 amLHR - ORD
2 stops21h 07mScandinavian Airlines
Thu 1/157:20 pmORD - LHR
1 stop14h 40mScandinavian Airlines
Deal found 12/3$641
This Gotogate deal was found by Cheapflights users on 12/3. 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.
Fri 12/1212:15 pmLHR - ORD
1 stop11h 05mIcelandair
Thu 1/156:30 pmORD - LHR
1 stop19h 00mIcelandair
Deal found 12/3$646
This Gotogate deal was found by Cheapflights users on 12/3. 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.
Mon 12/158:35 pmLHR - ORD
1 stop26h 45mIcelandair
Fri 1/166:30 pmORD - LHR
1 stop19h 00mIcelandair
Deal found 12/3$650
This Kiwi.com deal was found by Cheapflights users on 12/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/88:35 pmLHR - ORD
1 stop26h 45mIcelandair
Sun 12/146:30 pmORD - LHR
1 stop10h 20mIcelandair
Deal found 12/4$652
This Cheapflightsfares deal was found by Cheapflights users on 12/3. 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.
Sun 12/1410:20 amLHR - ORD
1 stop12h 25mScandinavian Airlines
Thu 2/57:20 pmORD - LHR
1 stop14h 40mScandinavian Airlines
Deal found 12/3$653
This The Travel House deal was found by Cheapflights users on 12/4. 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 12/127:50 pmLHR - ORD
2 stops50h 55mScandinavian Airlines
Fri 1/167:20 pmORD - LHR
1 stop32h 00mScandinavian Airlines
Deal found 12/4$658
This oojo deal was found by Cheapflights users on 12/3. 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.
Tue 12/237:50 pmLHR - ORD
2 stops26h 55mScandinavian Airlines
Thu 1/157:20 pmORD - LHR
2 stops17h 30mScandinavian Airlines
Deal found 12/3$664
This Trip.com deal was found by Cheapflights users on 12/3. 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.
Wed 12/3111:05 amLHR - MDW
1 stop12h 14mVirgin Atlantic
Wed 1/71:49 pmMDW - LHR
1 stop11h 16mVirgin Atlantic
Deal found 12/3$769
This Virgin Atlantic deal was found by Cheapflights users on 12/2. 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.
Wed 12/3111:05 amLHR - STL
1 stop17h 11mVirgin Atlantic
Wed 1/79:59 amSTL - LHR
2 stops14h 51mVirgin Atlantic
Deal found 12/2$818
This Expedia deal was found by Cheapflights users on 12/3. 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.
Wed 12/316:30 amLHR - MDW
2 stops32h 35mKLM
Wed 1/79:50 amMDW - LHR
1 stop15h 15mKLM
Deal found 12/3$846

Find flight deals from Heathrow to Illinois

Keep the following information in mind while searching for Heathrow to Illinois flight deals. Data was last updated December 4, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$624
(United Airlines)

One-way from

$386

Popular in

July

Cheapest in

February

Average price

$799

Good round-trip deal

$756 or less

Good one-way deal

$615 or less
Provider with most accurate pricing for London (LON)-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for London (LON)-Chicago (CHI) flights.
Search Deals
From London Heathrow to Illinois
Search Deals
One-way flight from London Heathrow to Illinois
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($105 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from London Heathrow to Illinois.
Search Deals
Price to beat on a one-way flight from London Heathrow to Illinois.
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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 December 4, 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 2/15

6:30 am-1:25 pm

1 stop12h 55m

Chicago O'Hare Intl

Sat 2/28

3:45 pm-5:55 am

Nonstop8h 10m

$626

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 3/19

7:05 am-5:45 pm

2 stops15h 40m

Chicago O'Hare Intl

Tue 3/24

10:40 am-9:20 am

2 stops17h 40m

$627

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 5/24

6:30 am-12:55 pm

1 stop12h 25m

Chicago O'Hare Intl

Fri 6/5

8:40 am-10:00 am

1 stop19h 20m

$645

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 4/30

1:05 pm-6:15 pm

1 stop11h 10m

Chicago O'Hare Intl

Mon 5/11

7:25 pm-11:55 am

1 stop10h 30m

$653

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 1/12

8:30 am-3:20 pm

1 stop12h 50m

Chicago O'Hare Intl

Mon 1/19

9:05 pm-11:15 am

Nonstop8h 10m

$654

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 5/1

1:05 pm-9:40 pm

1 stop14h 35m

Chicago O'Hare Intl

Thu 5/14

7:25 pm-11:55 am

1 stop10h 30m

$660

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 5/2

1:05 pm-6:15 pm

1 stop11h 10m

Chicago O'Hare Intl

Tue 5/12

7:25 pm-11:55 am

1 stop10h 30m

$660

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 5/3

1:05 pm-6:15 pm

1 stop11h 10m

Chicago O'Hare Intl

Thu 5/14

7:25 pm-11:55 am

1 stop10h 30m

$660

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 5/27

6:40 am-4:10 pm

1 stop15h 30m

Chicago O'Hare Intl

Sun 5/31

7:15 pm-5:40 pm

1 stop16h 25m

$669

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 1/12

8:05 pm-12:45 pm

1 stop22h 40m

Chicago O'Hare Intl

Mon 1/19

4:10 pm-1:40 pm

2 stops15h 30m

$683

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

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 $477). Flying from London Heathrow Airport to Illinois in July is currently the most expensive (average of $672). 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 December 4, 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 December 4, 2025.

The most flights from LHR to USIL are scheduled on a Thursday (42 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (30 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 December 4, 2025.
Read reviews from past customers who have flown Austrian Airlines, United Airlines, and American Airlines from London Heathrow Airport to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Austrian Airlines
7.6
Good
875 reviews

Comfort

7.3

Overall

7.6

Boarding

7.6

Crew

8.1

Food

6.8

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
Austrian Airlines
7.6
Good
875 reviews
Austrian Airlines
7.6
Good
875 reviews

Comfort

7.3

Overall

7.6

Boarding

7.6

Crew

8.1

Food

6.8

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
United Airlines
7.4
Good
9,065 reviews
Austrian Airlines
7.6
Good
875 reviews

Comfort

7.3

Overall

7.6

Boarding

7.6

Crew

8.1

Food

6.8

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
American Airlines
7.2
Good
11,047 reviews
Austrian Airlines
7.6
Good
875 reviews

Comfort

7.3

Overall

7.6

Boarding

7.6

Crew

8.1

Food

6.8

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
Aer Lingus
7.2
Good
1,384 reviews
Austrian Airlines
7.6
Good
875 reviews

Comfort

7.3

Overall

7.6

Boarding

7.6

Crew

8.1

Food

6.8

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
British Airways
6.7
Okay
7,562 reviews
Austrian Airlines
7.6
Good
875 reviews

Comfort

7.3

Overall

7.6

Boarding

7.6

Crew

8.1

Food

6.8

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the 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.

  • How long is the flight from London Heathrow Airport to Illinois?

    United Airlines, Scandinavian Airlines, and Icelandair can get you from London Heathrow Airport to Illinois in just under 11h 10m. Your travel time can differ by up to 4h 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 Scandinavian Airlines ($288), TAP AIR PORTUGAL ($400), and Icelandair ($472).

  • 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 Austrian Airlines (88%), Brussels Airlines (88%) or Lufthansa (88%) 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 $1,494, our data indicates the cheapest price to be $466. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around $369.

  • 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 $477). Flying from London Heathrow Airport to Illinois in July is currently the most expensive (average of $672). 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
Gatwick to John F Kennedy Intl flights
Heathrow to LaGuardia flights
Gatwick to Newark flights
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Stansted to John F Kennedy Intl flights
Gatwick to LaGuardia flights
Luton to John F Kennedy Intl flights
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Stansted to Newark flights
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Stansted to Miami flights
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Luton to Miami flights
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London City to Los Angeles flights
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Heathrow to George Bush Intcntl flights
Stansted to Los Angeles flights
London City to Boston flights
London City to San Francisco flights
Heathrow to Atlanta flights
Heathrow to Ontario flights
Gatwick to Fort Lauderdale flights
Heathrow to Reagan-National flights
Heathrow to Santa Ana flights
Gatwick to Dulles Intl flights
Stansted to Orlando flights
Luton to Los Angeles flights
Heathrow to Sky Harbor 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 December 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest$446Average$603FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$451Average$544FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$485Average$639FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$530Average$897FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$552Average$770FlexibilityNo cancel feeOn-time70%
TAP AIR PORTUGALCheapest$558Average$789FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$558Average$793FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$572Average$805FlexibilityNo cancel feeOn-time71%
FinnairCheapest$625Average$808FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$720Average$830FlexibilityNo cancel feeOn-time76%

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