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Heathrow

$248+ 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 3/1. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
Jan 26 — Feb 21
Sun 1/26
Sun 2/2
1 adult, Economy
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Cheap flight deals from Illinois to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Illinois (USIL) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 21, 2025.

Round-trip from

$587
(Cheapflightsfares)

One-way from

$255
(Kiwi.com)

Good round-trip deal

$684 or less

Good one-way deal

$451 or less
From Illinois to London Heathrow
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One-way flight from Illinois to London Heathrow
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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 January 21, 2025.

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.
Wed 2/265:18 pmORD - LHR
1 stop10h 02mIberia
Tue 3/2511:55 amLHR - ORD
Nonstop8h 50mIberia
Deal found 1/21$587
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/227:15 pmORD - LHR
2 stops20h 05mScandinavian Airlines
Tue 10/77:05 amLHR - ORD
2 stops15h 05mScandinavian Airlines
Deal found 1/21$589
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/227:15 pmORD - LHR
1 stop17h 40mTAP AIR PORTUGAL
Fri 1/316:00 amLHR - ORD
1 stop15h 30mTAP AIR PORTUGAL
Deal found 1/21$592
This Gotogate 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/47:30 pmORD - LHR
1 stop10h 25mIcelandair
Tue 4/89:25 pmLHR - ORD
1 stop26h 55mIcelandair
Deal found 1/21$596
This Finnair 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/228:35 pmORD - LHR
Nonstop7h 55mFinnair
Tue 4/297:30 amLHR - ORD
1 stop16h 20mFinnair
Deal found 1/20$598
This Ticket 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/42:08 pmMDW - LHR
1 stop10h 42mAir France
Wed 3/129:10 amLHR - MDW
1 stop14h 08mAir France
Deal found 1/19$618
This lastminute.com 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/272:08 pmMDW - LHR
1 stop10h 42mVirgin Atlantic
Tue 2/412:20 pmLHR - MDW
1 stop11h 51mVirgin Atlantic
Deal found 1/20$620
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/2411:42 amORD - LHR
1 stop14h 08mBritish Airways
Mon 3/318:15 pmLHR - ORD
1 stop24h 15mBritish Airways
Deal found 1/21$624
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/45:15 amORD - LHR
2 stops23h 35mMultiple Airlines
Tue 3/1812:15 pmLHR - ORD
2 stops24h 29mMultiple Airlines
Deal found 1/21$625
This United 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/59:10 pmORD - LHR
Nonstop8h 05mUnited Airlines
Mon 3/101:45 pmLHR - ORD
1 stop32h 30mUnited Airlines
Deal found 1/21$627
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/2810:53 amORD - LHR
1 stop13h 37mAir Canada
Thu 2/66:50 amLHR - ORD
2 stops13h 55mAir Canada
Deal found 1/21$628
This JetBlue 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/17:00 amORD - LHR
1 stop16h 55mJetBlue
Sat 2/88:25 amLHR - ORD
1 stop15h 30mJetBlue
Deal found 1/21$630

Find flights from Illinois to Heathrow within your budget

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 January 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 2/26

5:18 pm-9:20 am

1 stop10h 02m

London Heathrow

Wed 3/26

1:50 pm-5:40 pm

Nonstop8h 50m

$587

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 3/2

7:40 pm-11:25 am

1 stop9h 45m

London Heathrow

Fri 3/7

7:50 am-2:00 pm

1 stop12h 10m

$595

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 3/6

7:40 pm-4:25 pm

2 stops14h 45m

London Heathrow

Thu 3/13

7:05 am-6:50 pm

2 stops16h 45m

$599

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 2/7

6:30 pm-7:30 pm

1 stop19h 00m

London Heathrow

Tue 2/11

8:40 pm-5:20 pm

1 stop26h 40m

$610

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 2/4

11:35 am-11:50 am

2 stops18h 15m

London Heathrow

Tue 2/18

6:50 am-7:55 pm

2 stops19h 05m

$618

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 3/4

2:08 pm-6:50 am

1 stop10h 42m

London Heathrow

Wed 3/12

9:10 am-6:18 pm

1 stop14h 08m

$618

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 2/2

5:00 pm-6:50 am

Nonstop7h 50m

London Heathrow

Tue 2/11

3:45 pm-6:45 pm

Nonstop9h 00m

$619

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 3/4

2:08 pm-6:50 am

1 stop10h 42m

London Heathrow

Tue 3/11

9:10 am-6:18 pm

1 stop14h 08m

$623

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 3/11

7:20 am-8:30 am

2 stops20h 10m

London Heathrow

Tue 3/18

7:25 pm-3:05 pm

1 stop24h 40m

$626

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 2/1

7:00 am-5:55 am

1 stop16h 55m

London Heathrow

Sun 2/9

7:25 am-3:43 pm

1 stop14h 18m

$630

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 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.

Travel insights for flights from Illinois to Heathrow

Get recent, data-driven insights about flights from Illinois to Heathrow including ideal travel times, pricing trends, and more.

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 $1,137). 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 January 21, 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 January 21, 2025.

The most flights from USIL to LHR are scheduled on a Monday (38 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (26 on average).

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London Heathrow Airport, 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 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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 January 21, 2025.
To help decide which airline to fly from Illinois to London, see what other customers have to say about TAP AIR PORTUGAL, Icelandair and Air Canada. 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
8,521 reviews

Crew

8.6

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta
8.0
Very good
8,521 reviews
Delta
8.0
Very good
8,521 reviews

Crew

8.6

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM
7.8
Good
1,341 reviews
Delta
8.0
Very good
8,521 reviews

Crew

8.6

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Finnair
7.6
Good
1,286 reviews
Delta
8.0
Very good
8,521 reviews

Crew

8.6

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Austrian Airlines
7.6
Good
786 reviews
Delta
8.0
Very good
8,521 reviews

Crew

8.6

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

SWISS
7.5
Good
1,600 reviews
Delta
8.0
Very good
8,521 reviews

Crew

8.6

Entertainment

7.9

Overall

8.0

Boarding

8.2

Food

7.3

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 Icelandair. According to our data, you can fly for as low as $271. Users have also found prices from $274 and $329 on JetBlue and WestJet, 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 (70%), Iberia (68%) or American 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 $1,527, our data shows the cheapest flight currently is $391. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay $461 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 $1,137). 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 Illinois?

Book flights to Illinois if you plan to visit one of these locations
Hayes
Hounslow
Thornton Heath
Harrow
Luton
Wembley
Canterbury
Northampton
Gatwick
Horley
Milton Keynes
Dover
Orpington
Watford
Stratford-upon-Avon
Croydon
Borehamwood
Bromley
Folkestone
Ilford

Browse thousands of different options on Cheapflights for your next trip

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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 Gatwick flights
LaGuardia to Gatwick flights
Boston to London City flights
Newark to Luton flights
Miami to Heathrow flights
Dulles Intl to London City flights
Boston to Stansted flights
Baltimore to Gatwick flights
Los Angeles to London City flights
O'Hare Intl to Gatwick flights
Baltimore to Stansted flights
John F Kennedy Intl to Stansted flights
Minneapolis to Heathrow flights
O'Hare Intl to London City flights
Philadelphia to Heathrow flights
San Francisco to London City flights
San Francisco to Gatwick flights
Los Angeles to Gatwick flights
Seattle to Gatwick flights
Reagan-National to Gatwick flights
Newark to Stansted flights
Austin to Heathrow flights
Orlando to Gatwick flights
Hobby to Heathrow flights
Raleigh to Heathrow flights
Charlotte to Heathrow flights
Seattle to London City flights
Stewart 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 January 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$381Average$560FlexibilityNo cancel feeOn-time77%
DeltaCheapest$451Average$882FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$471Average$600FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$507Average$841FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$554Average$735FlexibilityNo cancel feeOn-time67%
FinnairCheapest$567Average$768FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$572Average$920FlexibilityNo cancel feeOn-time76%
SWISSCheapest$581Average$836FlexibilityNo cancel feeOn-time79%
IberiaCheapest$585Average$734FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$597Average$1,036FlexibilityNo cancel feeOn-time71%
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