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$230+ 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 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
oct. 17 — oct. 241
vie. 10/17
vie. 10/24
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 septiembre 17, 2025.

Round-trip from

$505
(Air Canada)

One-way from

$230
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$659

Good round-trip deal

$642 or less

Good one-way deal

$438 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 ($208 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($36 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 septiembre 17, 2025.

This Air Canada deal was found by Cheapflights users on 9/15. 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.
mié. 11/512:50 pmORD - LHR
1 stop12h 20mAir Canada
mar. 11/119:00 amLHR - ORD
2 stops15h 39mAir Canada
Deal found 9/15$505
This Air Canada deal was found by Cheapflights users on 9/16. 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.
lun. 12/112:50 pmORD - LHR
1 stop12h 20mMultiple Airlines
mar. 12/99:00 amLHR - ORD
2 stops15h 52mMultiple Airlines
Deal found 9/16$506
This United Airlines deal was found by Cheapflights users on 9/15. 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.
mar. 9/304:00 pmORD - LHR
Nonstop8h 20mUnited Airlines
mar. 10/76:50 amLHR - ORD
1 stop11h 15mUnited Airlines
Deal found 9/15$507
This Billigflug deal was found by Cheapflights users on 9/15. 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 Billigflug is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/229:50 pmORD - LHR
Nonstop7h 55mAir Canada
mar. 9/308:30 amLHR - ORD
Nonstop9h 00mAir Canada
Deal found 9/15$508
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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.
dom. 9/287:11 amORD - LHR
1 stop17h 19mAir Canada
mar. 10/76:50 amLHR - ORD
2 stops13h 58mAir Canada
Deal found 9/15$509
This Gurufare deal was found by Cheapflights users on 9/16. 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.
mar. 9/2310:35 pmORD - LHR
Nonstop7h 40mFinnair
vie. 10/32:25 pmLHR - ORD
Nonstop8h 35mFinnair
Deal found 9/16$510
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
lun. 9/294:20 pmORD - LHR
1 stop16h 00mAustrian Airlines
mar. 10/216:00 amLHR - ORD
1 stop13h 20mAustrian Airlines
Deal found 9/15$511
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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.
mar. 10/147:10 pmORD - LHR
Nonstop7h 55mBritish Airways
mar. 10/211:10 pmLHR - ORD
Nonstop8h 45mBritish Airways
Deal found 9/15$512
This Air Canada deal was found by Cheapflights users on 9/15. 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.
mié. 11/1210:00 amORD - LHR
2 stops15h 10mMultiple Airlines
mié. 11/196:50 amLHR - ORD
2 stops14h 05mMultiple Airlines
Deal found 9/15$513
This Delta deal was found by Cheapflights users on 9/15. 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.
lun. 9/298:10 pmORD - LHR
1 stop11h 00mDelta
mié. 10/159:00 amLHR - ORD
1 stop12h 00mDelta
Deal found 9/15$514
This Delta deal was found by Cheapflights users on 9/15. 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.
dom. 9/285:30 amORD - LHR
1 stop19h 45mDelta
vie. 10/176:30 amLHR - ORD
1 stop13h 40mDelta
Deal found 9/15$515
This Delta deal was found by Cheapflights users on 9/17. 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.
mar. 9/301:00 pmORD - LHR
1 stop11h 25mDelta
mar. 10/76:30 amLHR - ORD
1 stop13h 40mDelta
Deal found 9/17$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 septiembre 17, 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

dom. 9/28

4:00 pm-6:20 am

Nonstop8h 20m

London Heathrow

mar. 10/21

6:50 am-12:05 pm

1 stop11h 15m

$507

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

lun. 12/1

5:50 pm-7:55 am

Nonstop8h 05m

London Heathrow

mar. 12/9

6:50 am-12:10 pm

1 stop11h 20m

$507

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

dom. 11/2

9:30 pm-9:40 am

1 stop30h 10m

London Heathrow

jue. 11/20

1:25 pm-11:18 am

1 stop27h 53m

$511

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

lun. 11/3

4:56 pm-8:45 am

1 stop9h 49m

London Heathrow

jue. 11/20

8:55 am-3:10 pm

1 stop12h 15m

$512

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mar. 9/30

1:00 pm-6:25 am

1 stop11h 25m

London Heathrow

mié. 10/15

9:00 am-3:00 pm

1 stop12h 00m

$514

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mar. 9/30

2:05 pm-6:45 am

1 stop10h 40m

London Heathrow

vie. 10/17

8:40 am-2:10 pm

1 stop11h 30m

$516

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mar. 9/30

1:00 pm-6:25 am

1 stop11h 25m

London Heathrow

mar. 10/7

6:30 am-2:10 pm

1 stop13h 40m

$516

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

dom. 9/28

8:10 pm-1:10 pm

1 stop11h 00m

London Heathrow

jue. 10/16

8:40 am-2:10 pm

1 stop11h 30m

$516

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mar. 10/21

6:00 pm-8:20 am

Nonstop8h 20m

London Heathrow

mié. 10/29

1:35 pm-6:00 pm

Nonstop9h 25m

$517

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mar. 11/18

5:50 pm-7:55 am

Nonstop8h 05m

London Heathrow

mié. 11/26

7:40 am-11:00 am

Nonstop9h 20m

$517

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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 $1,097). 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 septiembre 17, 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 septiembre 17, 2025.

The most flights from USIL to LHR are scheduled on a Monday (57 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (51 on average).

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 $507, 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 $346 and $389 on Scandinavian Airlines and KLM, 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 Royal Jordanian (71%), American Airlines (68%) or Alaska Airlines (68%) 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 $2,491, 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 $426 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 $1,097). 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
Southend-on-Sea
Harrow
Canterbury
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Northampton
Gatwick
Borehamwood
Broadway
Aylesbury
Bedford
Wembley
Folkestone
Chichester

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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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Dulles Intl to London City flights
George Bush Intcntl to Heathrow flights
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Dallas/Fort Worth to Gatwick flights
Reagan-National to Gatwick flights
Los Angeles to London City flights
O'Hare Intl to Gatwick flights
San Francisco to Gatwick flights
Boston to Stansted flights
O'Hare Intl to London City flights
Los Angeles to Gatwick flights
Boston to Luton flights
LaGuardia to London City flights
Minneapolis to Heathrow flights
San Francisco to London City flights
Dulles Intl to Stansted flights
Hobby to Gatwick flights
Raleigh to Heathrow flights
Dulles Intl to Luton flights
Austin to Heathrow 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 septiembre 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$632FlexibilityNo cancel feeOn-time62%
SWISSCheapest$257Average$626FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$338Average$591FlexibilityNo cancel feeOn-time77%
DeltaCheapest$345Average$870FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$430Average$920FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$450Average$734FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$472Average$598FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$537Average$826FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$547Average$765FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$564Average$857FlexibilityNo cancel feeOn-time70%

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