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$394+ 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 2/7. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
Feb 20 — Feb 271
Fri 2/20
Fri 2/27
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 January 21, 2026.

This TravelUp 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/287:50 am
LHR
-
ORD
1 stop12h 10m
British Airways
Wed 11/118:40 pm
ORD
-
LHR
Nonstop7h 45m
British Airways
Deal found 1/21$532
This TravelUp 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/168:50 am
LHR
-
ORD
1 stop11h 10m
British Airways
Sun 4/196:00 pm
ORD
-
LHR
Nonstop7h 40m
British Airways
Deal found 1/21$533
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 1/287:50 am
LHR
-
ORD
2 stops18h 14m
British Airways
Mon 2/29:00 pm
ORD
-
LHR
1 stop16h 50m
British Airways
Deal found 1/20$534
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/512:10 pm
LHR
-
ORD
1 stop13h 05m
British Airways
Thu 2/126:30 pm
ORD
-
LHR
Nonstop7h 45m
British Airways
Deal found 1/21$535
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/126:40 am
LHR
-
ORD
1 stop16h 05m
Scandinavian Airlines
Wed 3/47:20 pm
ORD
-
LHR
1 stop14h 40m
Scandinavian Airlines
Deal found 1/19$536
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.
Sat 2/712:50 pm
LHR
-
ORD
1 stop12h 25m
British Airways
Sun 2/229:00 pm
ORD
-
LHR
1 stop16h 50m
British Airways
Deal found 1/20$537
This TravelUp 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/2112:50 pm
LHR
-
ORD
1 stop12h 25m
British Airways
Wed 2/255:10 pm
ORD
-
LHR
Nonstop7h 45m
British Airways
Deal found 1/21$539
This Lufthansa 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/49:00 am
LHR
-
ORD
1 stop13h 20m
Multiple Airlines
Thu 2/123:45 pm
ORD
-
LHR
Nonstop8h 10m
Multiple Airlines
Deal found 1/21$540
This Globehunters 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 Globehunters is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/166:00 am
LHR
-
ORD
1 stop14h 00m
Austrian Airlines
Tue 2/245:50 pm
ORD
-
LHR
Nonstop8h 05m
Austrian Airlines
Deal found 1/20$541
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/298:50 am
LHR
-
ORD
1 stop16h 25m
British Airways
Mon 2/29:00 pm
ORD
-
LHR
1 stop12h 35m
British Airways
Deal found 1/20$542
This Lufthansa 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/297:40 am
LHR
-
ORD
1 stop12h 30m
Lufthansa
Wed 2/113:45 pm
ORD
-
LHR
Nonstop8h 10m
Lufthansa
Deal found 1/20$543
This TravelUp 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/411:05 am
LHR
-
MDW
1 stop13h 31m
Virgin Atlantic
Wed 2/111:51 pm
MDW
-
LHR
1 stop11h 14m
Virgin Atlantic
Deal found 1/21$574

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 January 21, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$533
(TravelUp)

One-way from

$394
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$624

Good round-trip deal

$674 or less

Good one-way deal

$654 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. 14% potential increase in price ($119 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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.
Search Deals

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 January 21, 2026.
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 2/7

12:50 pm-7:15 pm

1 stop12h 25m

Chicago O'Hare Intl

Wed 2/18

6:30 pm-8:15 am

Nonstop7h 45m

$538

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 2/7

12:50 pm-7:15 pm

1 stop12h 25m

Chicago O'Hare Intl

Sat 2/14

6:48 pm-12:00 pm

1 stop11h 12m

$540

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 2/12

7:50 am-7:15 pm

1 stop17h 25m

Chicago O'Hare Intl

Fri 2/27

9:00 pm-7:50 pm

1 stop16h 50m

$540

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 3/4

8:50 am-2:00 pm

1 stop11h 10m

Chicago O'Hare Intl

Tue 3/10

9:35 pm-10:25 am

Nonstop7h 50m

$540

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 2/10

7:40 am-2:10 pm

1 stop12h 30m

Chicago O'Hare Intl

Mon 3/2

3:45 pm-5:55 am

Nonstop8h 10m

$545

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 2/17

8:30 am-3:20 pm

1 stop12h 50m

Chicago O'Hare Intl

Mon 3/2

9:15 pm-11:15 am

Nonstop8h 00m

$546

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 3/7

1:30 pm-11:44 pm

2 stops16h 14m

Chicago O'Hare Intl

Sat 3/14

9:15 pm-6:40 am

1 stop28h 25m

$552

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 4/16

7:40 am-2:00 pm

1 stop12h 20m

Chicago O'Hare Intl

Wed 4/22

11:21 am-6:25 am

1 stop13h 04m

$557

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 4/16

7:40 am-2:00 pm

1 stop12h 20m

Chicago O'Hare Intl

Tue 4/21

4:16 pm-9:10 am

1 stop10h 54m

$557

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 4/13

1:25 pm-7:15 pm

1 stop11h 50m

Chicago O'Hare Intl

Sun 4/19

4:49 pm-10:15 am

1 stop11h 26m

$557

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

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 $475). Flying from London Heathrow Airport to Illinois in July is currently the most expensive (average of $673). 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, 2026.

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, 2026.

The most flights from LHR to USIL are scheduled on a Wednesday (42 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (34 on average).

How much does it cost to fly round-trip from London Heathrow Airport to Illinois?

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, 2026.
Read reviews from past customers who have flown Austrian 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.
Austrian Airlines
7.6
Good
894 reviews

Entertainment

6.8

Overall

7.6

Comfort

7.3

Crew

8.1

Food

6.8

Boarding

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Dec 2025

VIE - DXB

Awful . Flight was overbooked. The boarding cards could not be printed, you had to wait more than one hour in a line that only two kiosks were working, staff was leaving and inside the plane they had the same seats in 3 cases at least winter twice!! I’ve never experienced such a disorganization! Awful
Austrian Airlines
7.6
Good
894 reviews
Austrian Airlines
7.6
Good
894 reviews

Entertainment

6.8

Overall

7.6

Comfort

7.3

Crew

8.1

Food

6.8

Boarding

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Dec 2025

VIE - DXB

Awful . Flight was overbooked. The boarding cards could not be printed, you had to wait more than one hour in a line that only two kiosks were working, staff was leaving and inside the plane they had the same seats in 3 cases at least winter twice!! I’ve never experienced such a disorganization! Awful
American Airlines
7.2
Good
11,174 reviews
Austrian Airlines
7.6
Good
894 reviews

Entertainment

6.8

Overall

7.6

Comfort

7.3

Crew

8.1

Food

6.8

Boarding

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Dec 2025

VIE - DXB

Awful . Flight was overbooked. The boarding cards could not be printed, you had to wait more than one hour in a line that only two kiosks were working, staff was leaving and inside the plane they had the same seats in 3 cases at least winter twice!! I’ve never experienced such a disorganization! Awful
Aer Lingus
7.2
Good
1,441 reviews
Austrian Airlines
7.6
Good
894 reviews

Entertainment

6.8

Overall

7.6

Comfort

7.3

Crew

8.1

Food

6.8

Boarding

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Dec 2025

VIE - DXB

Awful . Flight was overbooked. The boarding cards could not be printed, you had to wait more than one hour in a line that only two kiosks were working, staff was leaving and inside the plane they had the same seats in 3 cases at least winter twice!! I’ve never experienced such a disorganization! Awful
Lufthansa
6.8
Okay
7,738 reviews
Austrian Airlines
7.6
Good
894 reviews

Entertainment

6.8

Overall

7.6

Comfort

7.3

Crew

8.1

Food

6.8

Boarding

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Dec 2025

VIE - DXB

Awful . Flight was overbooked. The boarding cards could not be printed, you had to wait more than one hour in a line that only two kiosks were working, staff was leaving and inside the plane they had the same seats in 3 cases at least winter twice!! I’ve never experienced such a disorganization! Awful
British Airways
6.7
Okay
7,690 reviews
Austrian Airlines
7.6
Good
894 reviews

Entertainment

6.8

Overall

7.6

Comfort

7.3

Crew

8.1

Food

6.8

Boarding

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Dec 2025

VIE - DXB

Awful . Flight was overbooked. The boarding cards could not be printed, you had to wait more than one hour in a line that only two kiosks were working, staff was leaving and inside the plane they had the same seats in 3 cases at least winter twice!! I’ve never experienced such a disorganization! Awful

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?

    British Airways, Delta, and Virgin Atlantic can get you from London Heathrow Airport to Illinois in just under 12h 25m. Your travel time can differ by up to 4h 50m. 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 ($393), and Aer Lingus ($475).

  • 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 SWISS (88%), Austrian Airlines (87%) or Air Canada (87%) 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 $1,492, our data indicates the cheapest price to be $502. The most popular route (London Heathrow - Chicago O'Hare Intl), is priced around $411.

  • 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 $475). Flying from London Heathrow Airport to Illinois in July is currently the most expensive (average of $673). 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.
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Gatwick 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, 2026.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest$446Average$672FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$477Average$588FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$485Average$647FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$530Average$897FlexibilityNo cancel feeOn-time78%
British AirwaysCheapest$550Average$771FlexibilityNo cancel feeOn-time70%
TAP AIR PORTUGALCheapest$558Average$789FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$558Average$778FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$572Average$776FlexibilityNo cancel feeOn-time71%
FinnairCheapest$576Average$733FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$720Average$838FlexibilityNo cancel feeOn-time76%

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