HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$402+ 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 3/19. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ORD
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Heathrow to Illinois with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$527
(Lufthansa)

One-way from

$402
(Kiwi.com)

Popular in

August

Cheapest in

February

Average price

$579

Good round-trip deal

$640 or less

Good one-way deal

$646 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. 12% potential increase in price ($98 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 February 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.
Search Deals

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 February 20, 2025.

This Lufthansa deal was found by Cheapflights users on 2/20. 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.
Wed 4/236:00 amLHR - ORD
1 stop12h 10mMultiple Airlines
Tue 4/294:05 pmORD - LHR
Nonstop8h 15mMultiple Airlines
Deal found 2/20$527
This United Airlines deal was found by Cheapflights users on 2/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/77:40 amLHR - ORD
1 stop12h 30mUnited Airlines
Tue 3/182:16 pmORD - LHR
1 stop10h 39mUnited Airlines
Deal found 2/20$528
This Gotogate deal was found by Cheapflights users on 2/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/258:40 pmLHR - ORD
1 stop26h 40mIcelandair
Mon 3/36:30 pmORD - LHR
1 stop19h 00mIcelandair
Deal found 2/20$531
This Mytrip deal was found by Cheapflights users on 2/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/216:00 amLHR - ORD
1 stop15h 30mTAP AIR PORTUGAL
Fri 2/288:20 pmORD - LHR
1 stop16h 35mTAP AIR PORTUGAL
Deal found 2/20$534
This Kiwi.com deal was found by Cheapflights users on 2/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/66:00 amLHR - ORD
1 stop12h 55mSWISS
Tue 3/188:05 pmORD - LHR
1 stop11h 55mSWISS
Deal found 2/20$536
This TravelUp deal was found by Cheapflights users on 2/20. 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.
Sat 3/12:10 pmLHR - ORD
Nonstop8h 50mBritish Airways
Tue 3/189:15 pmORD - LHR
Nonstop7h 45mBritish Airways
Deal found 2/20$537
This StudentUniverse deal was found by Cheapflights users on 2/20. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2311:05 amLHR - ORD
Nonstop8h 45mFinnair
Tue 4/294:55 pmORD - LHR
Nonstop7h 55mFinnair
Deal found 2/20$542
This ChecknFly deal was found by Cheapflights users on 2/20. 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 ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/272:30 pmLHR - ORD
1 stop13h 36mLufthansa
Wed 4/29:20 pmORD - LHR
Nonstop8h 25mLufthansa
Deal found 2/20$543
This Mytrip deal was found by Cheapflights users on 2/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/232:10 pmLHR - ORD
Nonstop9h 05mBrussels Airlines
Tue 4/299:20 pmORD - LHR
Nonstop8h 25mBrussels Airlines
Deal found 2/20$556
This TravelUp deal was found by Cheapflights users on 2/20. 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.
Sat 3/19:10 amLHR - MDW
1 stop14h 33mKLM
Tue 3/182:55 pmMDW - LHR
1 stop10h 55mKLM
Deal found 2/20$558
This TravelUp deal was found by Cheapflights users on 2/19. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/189:10 amLHR - MDW
1 stop14h 08mAir France
Mon 3/241:16 pmMDW - LHR
1 stop12h 49mAir France
Deal found 2/19$559
This lastminute.com deal was found by Cheapflights users on 2/20. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/112:40 pmLHR - ORD
1 stop14h 44mVirgin Atlantic
Mon 3/175:30 pmORD - LHR
1 stop12h 05mVirgin Atlantic
Deal found 2/20$562

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 February 20, 2025.

Fly from

Heathrow

Fly to

Illinois

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 4/23

6:00 am-12:10 pm

1 stop12h 10m

Chicago O'Hare Intl

Tue 4/29

4:05 pm-6:20 am

Nonstop8h 15m

$527

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 3/7

7:40 am-2:10 pm

1 stop12h 30m

Chicago O'Hare Intl

Wed 3/12

12:48 pm-5:55 am

1 stop12h 07m

$528

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 3/8

7:40 am-2:10 pm

1 stop12h 30m

Chicago O'Hare Intl

Wed 3/12

4:15 pm-8:45 am

1 stop11h 30m

$534

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 3/6

6:00 am-12:55 pm

1 stop12h 55m

Chicago O'Hare Intl

Tue 3/18

8:05 pm-1:00 pm

1 stop11h 55m

$536

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 3/12

10:25 am-2:50 pm

Nonstop9h 25m

Chicago O'Hare Intl

Wed 3/26

6:50 pm-7:55 am

Nonstop8h 05m

$537

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 4/15

9:25 pm-9:15 pm

1 stop29h 50m

Chicago O'Hare Intl

Tue 4/29

7:30 pm-11:55 am

1 stop10h 25m

$539

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 3/6

11:55 am-2:45 pm

Nonstop8h 50m

Chicago O'Hare Intl

Mon 3/10

9:15 pm-10:00 am

Nonstop7h 45m

$540

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 4/23

11:05 am-1:50 pm

Nonstop8h 45m

Chicago O'Hare Intl

Tue 4/29

4:55 pm-6:50 am

Nonstop7h 55m

$542

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 4/23

2:10 pm-5:15 pm

Nonstop9h 05m

Chicago O'Hare Intl

Tue 4/29

9:20 pm-11:45 am

Nonstop8h 25m

$556

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Thu 3/20

9:10 am-6:18 pm

1 stop14h 08m

Chicago Midway

Thu 3/27

2:55 pm-6:50 am

1 stop10h 55m

$558

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 57 results
1
2
3
...
6

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 $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 February 20, 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 February 20, 2025.

The most flights from LHR to USIL are scheduled on a Wednesday (38 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (33 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 February 20, 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
8,219 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

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
8,219 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

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
1,333 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

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
1,274 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

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
7.6
Good
773 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

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
1,568 reviews
Delta
8.0
Very good
8,219 reviews

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

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 WestJet ($450), Icelandair ($504), and Aer Lingus ($516).

  • 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 (91%), Austrian Airlines (91%) or United Airlines (91%) 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 $1,316, our data indicates the cheapest price to be $547. 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 $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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Heathrow to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to Newark flights
Heathrow to John F Kennedy Intl flights
Heathrow to LaGuardia flights
London City to John F Kennedy Intl flights
Gatwick to Newark flights
London City to Newark flights
Gatwick to John F Kennedy Intl flights
Heathrow to Los Angeles flights
Heathrow to Orlando flights
Luton to John F Kennedy Intl flights
Heathrow to Miami flights
Heathrow to Boston flights
Gatwick to LaGuardia flights
Luton to Stewart flights
Heathrow to O'Hare Intl flights
Heathrow to San Francisco flights
Luton to Newark flights
Heathrow to Dallas/Fort Worth flights
Heathrow to Las Vegas flights
Stansted to John F Kennedy Intl flights
Heathrow to Dulles Intl flights
Heathrow to Seattle flights
Gatwick to Boston flights
Heathrow to Atlanta flights
Heathrow to Baltimore flights
London City to Los Angeles flights
Gatwick to Orlando flights
London City to Miami flights
London City to Boston flights
Heathrow to Hobby flights
Heathrow to Tampa flights
Heathrow to Denver flights
Gatwick to Los Angeles flights
Heathrow to George Bush Intcntl flights
Gatwick to Miami flights
London City to San Francisco flights
Gatwick to O'Hare Intl flights
Heathrow to Charlotte flights
Gatwick to San Francisco flights
London City to O'Hare Intl flights
Gatwick to Las Vegas flights
Heathrow to Philadelphia flights
Stansted to Boston flights
Heathrow to Ontario flights
London City to Las Vegas flights
Heathrow to Nashville flights
Heathrow to Midway flights
Stansted to Newark 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$451Average$587FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$462Average$666FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$483Average$729FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$556Average$782FlexibilityNo cancel feeOn-time71%
Aer LingusCheapest$576Average$736FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$579Average$963FlexibilityNo cancel feeOn-time69%
IberiaCheapest$582Average$793FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$589Average$797FlexibilityNo cancel feeOn-time70%
FinnairCheapest$607Average$866FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$660Average$1,067FlexibilityNo cancel feeOn-time76%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.