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$232+ 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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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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 September 11, 2025.

Round-trip from

$505
(United Airlines)

One-way from

$232
(lol.travel)

Popular in

June

Cheapest in

February

Average price

$663

Good round-trip deal

$639 or less

Good one-way deal

$434 or less
From Illinois to London Heathrow
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One-way flight from Illinois to London Heathrow
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Highest demand for flights based on searches. 21% potential increase in price ($204 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Illinois to London Heathrow.
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Price to beat on a one-way flight from Illinois to London Heathrow.
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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 September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/8. 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.
Sun 9/284:00 pmORD - LHR
Nonstop8h 20mUnited Airlines
Wed 10/156:50 amLHR - ORD
1 stop11h 15mUnited Airlines
Deal found 9/8$505
This United Airlines deal was found by Cheapflights users on 9/9. 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 9/249:50 pmORD - LHR
Nonstop7h 55mUnited Airlines
Wed 10/226:50 amLHR - ORD
1 stop11h 15mUnited Airlines
Deal found 9/9$506
This Air Canada deal was found by Cheapflights users on 9/11. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1212:50 pmORD - LHR
1 stop12h 20mAir Canada
Fri 11/216:50 amLHR - ORD
2 stops14h 05mAir Canada
Deal found 9/11$507
This Tripair deal was found by Cheapflights users on 9/9. 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 Tripair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2111:40 amORD - LHR
1 stop13h 15mUnited Airlines
Tue 9/3011:05 amLHR - ORD
Nonstop9h 05mUnited Airlines
Deal found 9/9$508
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Thu 9/189:05 pmORD - LHR
1 stop28h 35mUnited Airlines
Sun 9/216:50 amLHR - ORD
1 stop11h 15mUnited Airlines
Deal found 9/9$509
This United Airlines deal was found by Cheapflights users on 9/10. 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 11/18:18 pmORD - LHR
1 stop32h 22mUnited Airlines
Fri 11/141:25 pmLHR - ORD
1 stop27h 53mUnited Airlines
Deal found 9/10$510
This United Airlines deal was found by Cheapflights users on 9/11. 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 9/242:32 pmORD - LHR
1 stop10h 23mUnited Airlines
Tue 10/76:50 amLHR - ORD
1 stop11h 15mUnited Airlines
Deal found 9/11$511
This Air Canada deal was found by Cheapflights users on 9/11. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/511:15 amORD - LHR
2 stops13h 55mMultiple Airlines
Tue 11/119:00 amLHR - ORD
2 stops15h 39mMultiple Airlines
Deal found 9/11$512
This Delta deal was found by Cheapflights users on 9/8. 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.
Wed 11/121:25 pmORD - LHR
1 stop10h 55mDelta
Thu 11/206:20 amLHR - ORD
1 stop14h 50mDelta
Deal found 9/8$513
This Delta deal was found by Cheapflights users on 9/11. 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.
Wed 10/16:28 pmORD - LHR
1 stop11h 37mDelta
Wed 11/198:55 amLHR - ORD
1 stop12h 15mDelta
Deal found 9/11$514
This Delta deal was found by Cheapflights users on 9/11. 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.
Wed 9/241:00 pmORD - LHR
1 stop11h 25mDelta
Fri 10/36:30 amLHR - ORD
1 stop13h 40mDelta
Deal found 9/11$515
This United deal was found by Cheapflights users on 9/11. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/218:40 amORD - LHR
1 stop15h 50mMultiple Airlines
Tue 9/302:05 pmLHR - ORD
1 stop23h 56mMultiple Airlines
Deal found 9/11$516

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 September 11, 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

Sun 9/28

4:00 pm-6:20 am

Nonstop8h 20m

London Heathrow

Tue 10/21

6:50 am-12:05 pm

1 stop11h 15m

$506

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 11/12

5:50 pm-7:55 am

Nonstop8h 05m

London Heathrow

Wed 11/19

6:50 am-12:10 pm

1 stop11h 20m

$506

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 11/1

8:18 pm-9:40 am

1 stop32h 22m

London Heathrow

Mon 11/10

12:05 pm-4:20 pm

1 stop34h 15m

$514

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 9/21

6:00 pm-8:20 am

Nonstop8h 20m

London Heathrow

Tue 9/30

2:05 pm-8:01 am

1 stop23h 56m

$516

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 9/24

4:00 pm-6:20 am

Nonstop8h 20m

London Heathrow

Fri 10/3

2:10 pm-5:20 pm

Nonstop9h 10m

$517

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 2/9

6:30 pm-7:30 pm

1 stop19h 00m

London Heathrow

Fri 2/20

12:15 pm-5:20 pm

1 stop11h 05m

$522

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 9/29

9:50 am-7:15 am

1 stop15h 25m

London Heathrow

Wed 10/8

8:40 am-8:37 pm

2 stops17h 57m

$524

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Wed 11/12

1:14 pm-8:45 am

1 stop13h 31m

London Heathrow

Wed 11/19

6:20 am-6:08 pm

2 stops17h 48m

$524

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 10/14

12:48 pm-7:15 am

1 stop12h 27m

London Heathrow

Thu 11/13

6:20 am-6:08 pm

2 stops17h 48m

$524

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Sun 10/19

9:35 am-8:55 am

1 stop17h 20m

London Heathrow

Tue 11/4

6:20 am-6:25 pm

2 stops18h 05m

$524

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 60 results
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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 $1,098). 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 September 11, 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 September 11, 2025.

The most flights from USIL to LHR are scheduled on a Tuesday (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?

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.

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

    For as low as $506, United Airlines can have you in London Heathrow Airport from Illinois in 8h 20m. There are 3939 mi between Illinois and London Heathrow Airport. This flight may include one or multiple stops.

  • 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 $324. Users have also found prices from $372 and $393 on Virgin Atlantic and Delta, 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 Aer Lingus (64%), American Airlines (62%) or Air Canada (62%) 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 $2,490, our data shows the cheapest flight currently is $388. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay $423 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 $1,098). 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
Southend-on-Sea
Harrow
Canterbury
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Northampton
Gatwick
Borehamwood
Broadway
Aylesbury
Bedford
Wembley
Folkestone

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Alternative routes for Illinois to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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Atlanta to Heathrow flights
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Philadelphia to Heathrow flights
Boston to London City flights
Denver to Heathrow flights
Dulles Intl to Gatwick flights
Orlando to Heathrow flights
Newark to Stansted flights
Newark to Luton flights
Dulles Intl to London City flights
Baltimore to Gatwick flights
Los Angeles to London City flights
George Bush Intcntl to Heathrow flights
Reagan-National to Gatwick flights
O'Hare Intl to Gatwick flights
San Francisco to Gatwick flights
Los Angeles to Gatwick flights
O'Hare Intl to London City flights
Dallas/Fort Worth to Gatwick flights
Austin to Heathrow flights
LaGuardia to London City flights
San Francisco to London City flights
Minneapolis to Heathrow flights
Seattle to Gatwick flights
Orlando to Gatwick flights
Boston to Stansted flights
Raleigh to Heathrow flights
Dulles Intl to Stansted 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$632FlexibilityNo cancel feeOn-time62%
SWISSCheapest$257Average$626FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$338Average$597FlexibilityNo cancel feeOn-time77%
DeltaCheapest$345Average$870FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$430Average$920FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$472Average$597FlexibilityNo cancel feeOn-time76%
FinnairCheapest$554Average$759FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$554Average$804FlexibilityNo cancel feeOn-timeN/A
Aer LingusCheapest$562Average$824FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$567Average$858FlexibilityNo cancel feeOn-time70%

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