HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Heathrow

$271+ Cheap flights from Illinois to Heathrow (LHR)

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 10/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
Jul 30 — Aug 61
Wed 7/30
Wed 8/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Heathrow 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 Illinois to Heathrow

Keep the following information in mind while searching for Illinois to Heathrow flight deals. Data was last updated July 25, 2025.

Round-trip from

$541
(Ovago)

One-way from

$271
(Mytrip)

Popular in

June

Cheapest in

February

Average price

$1,041

Good round-trip deal

$653 or less

Good one-way deal

$388 or less
From Illinois to London Heathrow
Search Deals
One-way flight from Illinois to London Heathrow
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($208 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals
Price to beat on a round-trip flight from Illinois to London Heathrow.
Search Deals
Price to beat on a one-way flight from Illinois to London Heathrow.
Search Deals

Find flight deals from Illinois to Heathrow

Cheapest flights from Illinois to Heathrow
Explore the most affordable flight options available from Illinois to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 25, 2025.

This Ovago deal was found by Cheapflights users on 7/24. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/14:36 pmORD - LHR
1 stop10h 34mBritish Airways
Thu 8/146:20 amLHR - ORD
1 stop15h 25mBritish Airways
Deal found 7/24$541
This Austrian Airlines deal was found by Cheapflights users on 7/24. 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.
Tue 10/1412:55 pmORD - LHR
2 stops19h 25mAustrian Airlines
Tue 10/289:05 amLHR - ORD
1 stop34h 55mAustrian Airlines
Deal found 7/24$542
This Virgin Atlantic deal was found by Cheapflights users on 7/24. 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.
Sun 8/35:39 pmORD - LHR
1 stop13h 31mVirgin Atlantic
Tue 8/1210:55 amLHR - ORD
2 stops15h 28mVirgin Atlantic
Deal found 7/24$543
This Virgin Atlantic deal was found by Cheapflights users on 7/24. 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.
Tue 8/59:25 amMDW - LHR
2 stops15h 20mVirgin Atlantic
Thu 8/149:20 amLHR - MDW
1 stop18h 24mVirgin Atlantic
Deal found 7/24$543
This oojo deal was found by Cheapflights users on 7/24. 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.
Sat 11/297:20 pmORD - LHR
2 stops15h 05mScandinavian Airlines
Fri 12/57:05 amLHR - ORD
2 stops15h 40mScandinavian Airlines
Deal found 7/24$545
This Gurufare deal was found by Cheapflights users on 7/24. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/103:45 pmORD - LHR
Nonstop8h 10mSWISS
Mon 12/88:05 pmLHR - ORD
1 stop26h 15mSWISS
Deal found 7/24$548
This United Airlines deal was found by Cheapflights users on 7/24. 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.
Mon 9/229:25 pmORD - LHR
Nonstop8h 20mUnited Airlines
Mon 9/298:30 amLHR - ORD
1 stop32h 30mUnited Airlines
Deal found 7/24$550
This Ovago deal was found by Cheapflights users on 7/24. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/16:00 pmORD - LHR
Nonstop8h 20mLufthansa
Fri 10/176:30 amLHR - ORD
1 stop12h 25mLufthansa
Deal found 7/24$551
This United Airlines deal was found by Cheapflights users on 7/24. 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.
Wed 11/51:35 pmSTL - LHR
1 stop14h 05mUnited Airlines
Mon 11/101:25 pmLHR - STL
2 stops31h 00mUnited Airlines
Deal found 7/24$558
This Kiwi.com deal was found by Cheapflights users on 7/23. 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.
Tue 7/298:15 pmORD - LHR
Nonstop8h 05mIberia
Tue 8/129:45 amLHR - ORD
1 stop12h 40mIberia
Deal found 7/23$560
This Cheapflightsfares deal was found by Cheapflights users on 7/23. 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 9/43:59 pmSTL - LHR
1 stop12h 51mBritish Airways
Wed 9/1012:00 pmLHR - STL
1 stop14h 15mBritish Airways
Deal found 7/23$563
This Cheapflightsfares deal was found by Cheapflights users on 7/24. 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.
Mon 8/185:30 pmSTL - LHR
2 stops16h 10mLufthansa
Mon 8/258:25 pmLHR - STL
2 stops25h 19mLufthansa
Deal found 7/24$564

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Heathrow 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 July 25, 2025.
Use the filters below to find and compare flights from Illinois to London Heathrow Airport that are best for you.

Fly from

Illinois

Fly to

Heathrow

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 8/1

4:36 pm-9:10 am

1 stop10h 34m

London Heathrow

Thu 8/14

6:20 am-3:45 pm

1 stop15h 25m

$541

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 10/14

12:55 pm-2:20 pm

2 stops19h 25m

London Heathrow

Tue 10/28

9:05 am-3:00 pm

1 stop34h 55m

$542

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 8/3

5:39 pm-1:10 pm

1 stop13h 31m

London Heathrow

Tue 8/12

10:55 am-8:23 pm

2 stops15h 28m

$543

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 8/5

9:25 am-6:45 am

2 stops15h 20m

London Heathrow

Thu 8/14

9:20 am-9:44 pm

1 stop18h 24m

$543

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 7/30

3:16 pm-7:50 am

1 stop10h 34m

London Heathrow

Wed 8/13

9:45 am-4:25 pm

1 stop12h 40m

$547

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 9/22

9:25 pm-11:45 am

Nonstop8h 20m

London Heathrow

Mon 9/29

8:30 am-11:00 am

1 stop32h 30m

$550

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 10/20

7:15 pm-9:35 pm

2 stops20h 20m

London Heathrow

Tue 10/28

9:05 pm-9:05 pm

2 stops29h 00m

$557

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 11/5

1:35 pm-9:40 am

1 stop14h 05m

London Heathrow

Mon 11/10

1:25 pm-2:25 pm

2 stops31h 00m

$558

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 9/4

3:59 pm-10:50 am

1 stop12h 51m

London Heathrow

Wed 9/10

12:00 pm-8:15 pm

1 stop14h 15m

$563

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 8/18

5:30 pm-3:40 pm

2 stops16h 10m

London Heathrow

Mon 8/25

8:25 pm-3:44 pm

2 stops25h 19m

$564

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/24

Showing 1-10 of 54 results
1
2
3
...
6

Best time to book a flight from Illinois to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Illinois 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 Illinois to London Heathrow Airport

What is the cheapest month to book a flight from Illinois to London Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from Illinois to London Heathrow Airport (average of $661). Flying from Illinois to London Heathrow Airport in June is currently the most expensive (average of $1,096). 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 IL to LHR?

Find hourly flight availability from Illinois to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 25, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to London Heathrow Airport as you normally would.

Weekly flight availability from Illinois to London Heathrow Airport

Explore weekly flight availability from Illinois to Heathrow. 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 July 25, 2025.

The most flights from USIL to LHR are scheduled on a Monday (57 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (52 on average).

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

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated July 25, 2025.
Read reviews from past customers who have flown Delta, KLM, and Austrian Airlines from Illinois to London Heathrow Airport. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,967 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,967 reviews
Delta
8.0
Very good
7,967 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,375 reviews
Delta
8.0
Very good
7,967 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Austrian Airlines
7.6
Good
820 reviews
Delta
8.0
Very good
7,967 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Finnair
7.6
Good
1,316 reviews
Delta
8.0
Very good
7,967 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air France
7.5
Good
1,462 reviews
Delta
8.0
Very good
7,967 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Illinois to Heathrow. 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 Illinois to London Heathrow Airport one-way?

    For one-way options, check prices for JetBlue. According to our data, you can fly for as low as $313. Users have also found prices from $318 and $324 on Icelandair and TAP AIR PORTUGAL, respectively.

  • What are the most popular routes from Illinois to London Heathrow Airport?

    The most popular flight routes from Illinois to London Heathrow Airport are Chicago O'Hare Intl - London Heathrow, Chicago Midway - London Heathrow and Lambert-St Louis - London Heathrow.

  • What are the most reliable airlines from Illinois to London Heathrow Airport?

    Consider Air Canada (66%), Austrian Airlines (66%) or United Airlines (66%) when booking your flight. These represent the most reliable airlines when flying from Illinois to London Heathrow Airport.

  • What are the cheapest flights from Illinois to London Heathrow Airport?

    While on average a flight from Illinois to London Heathrow Airport is generally $2,848, our data shows the cheapest flight currently is $211. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay $455 for that flight.

  • Can I find deals for flights from Illinois to Heathrow that include hotel bookings?

    Yes. In addition to deals on Illinois to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Heathrow.

  • Can I find deals for business class flights from Illinois to Heathrow?

    Yes. Cheapflights offers flight deals from Illinois to Heathrow 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 Illinois to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from Illinois to London Heathrow Airport (average of $661). Flying from Illinois to London Heathrow Airport in June is currently the most expensive (average of $1,096). 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

Traveling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Harrow
Canterbury
Dover
Stratford-upon-Avon
Gatwick
Orpington
Watford
Northampton
Borehamwood
Dartford
Broadway
Aylesbury
Chelmsford
Folkestone
Southend-on-Sea
Chichester
Swindon

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 Illinois to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Heathrow flights
Newark to Heathrow flights
John F Kennedy Intl to London City flights
John F Kennedy Intl to Gatwick flights
Newark to Gatwick flights
LaGuardia to Heathrow flights
Newark to London City flights
LaGuardia to Gatwick flights
John F Kennedy Intl to Stansted flights
Boston to Heathrow flights
Dulles Intl to Heathrow flights
John F Kennedy Intl to Luton flights
Los Angeles to Heathrow flights
O'Hare Intl to Heathrow flights
Seattle to Heathrow flights
Baltimore to Heathrow flights
San Francisco to Heathrow flights
Newark to Stansted flights
Dallas/Fort Worth to Heathrow flights
Newark to Luton flights
Boston to Gatwick flights
Atlanta to Heathrow flights
Reagan-National to Heathrow flights
Dulles Intl to Gatwick flights
Boston to London City flights
Philadelphia to Heathrow flights
Miami to Heathrow flights
Denver to Heathrow flights
Dulles Intl to London City flights
O'Hare Intl to Gatwick flights
Orlando to Heathrow flights
O'Hare Intl to London City flights
Baltimore to Gatwick flights
Seattle to Gatwick flights
LaGuardia to Stansted flights
Hobby to Heathrow flights
San Francisco to Gatwick flights
Los Angeles to London City flights
Minneapolis to Heathrow flights
Reagan-National to Gatwick flights
Seattle to London City flights
San Francisco to London City flights
Atlanta to Gatwick flights
Los Angeles to Gatwick flights
Boston to Stansted flights
Dallas/Fort Worth to Gatwick flights
Orlando to Gatwick flights
LaGuardia to Luton flights
Tampa to Heathrow flights
Boston to Luton flights

Top 10 airlines flying from Illinois to Heathrow

Discover the top 10 airlines that operate flights from Illinois to Heathrow. 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 July 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
SWISSCheapest$257Average$671FlexibilityNo cancel feeOn-time79%
DeltaCheapest$345Average$760FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$358Average$597FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$430Average$917FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$470Average$592FlexibilityNo cancel feeOn-time76%
JetBlueCheapest$505Average$869FlexibilityNo cancel feeOn-time62%
TAP AIR PORTUGALCheapest$508Average$804FlexibilityNo cancel feeOn-timeN/A
Aer LingusCheapest$559Average$814FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$569Average$757FlexibilityNo cancel feeOn-time76%
IberiaCheapest$581Average$743FlexibilityNo cancel feeOn-time77%

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.