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$265+ 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 4/2. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$585
(lastminute.com)

One-way from

$269
(Expedia)

Popular in

June

Cheapest in

February

Average price

$651

Good round-trip deal

$659 or less

Good one-way deal

$457 or less
Provider with most accurate pricing for Chicago (CHI)-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-London (LON) flights.
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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. 18% potential increase in price ($178 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).
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Average for round-trip flights in February 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 February 20, 2025.

This Scandinavian 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/168:40 pmORD - LHR
2 stops17h 10mScandinavian Airlines
Sun 3/239:05 pmLHR - ORD
2 stops26h 45mScandinavian Airlines
Deal found 2/20$585
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/14:55 pmORD - LHR
Nonstop7h 55mFinnair
Wed 4/2310:20 amLHR - ORD
1 stop13h 30mFinnair
Deal found 2/20$586
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/99:15 pmORD - LHR
Nonstop7h 45mIberia
Wed 3/1911:00 amLHR - ORD
Nonstop8h 55mIberia
Deal found 2/19$587
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/247:30 pmORD - LHR
1 stop18h 50mIcelandair
Wed 4/301:05 pmLHR - ORD
1 stop14h 10mIcelandair
Deal found 2/20$589
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/47:40 pmORD - LHR
1 stop9h 45mAer Lingus
Wed 3/1212:10 pmLHR - ORD
1 stop11h 45mAer Lingus
Deal found 2/19$593
This Ticket 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/910:25 amORD - LHR
1 stop15h 25mVirgin Atlantic
Tue 3/189:00 amLHR - ORD
1 stop12h 05mVirgin Atlantic
Deal found 2/19$605
This TAP AIR PORTUGAL 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 TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/197:15 pmORD - LHR
1 stop14h 15mTAP AIR PORTUGAL
Tue 3/186:30 pmLHR - ORD
1 stop27h 00mTAP AIR PORTUGAL
Deal found 2/19$607
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.
Sun 4/69:20 pmORD - LHR
Nonstop8h 25mUnited Airlines
Sun 4/138:45 amLHR - ORD
1 stop33h 25mUnited Airlines
Deal found 2/20$616
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.
Thu 3/137:20 amORD - LHR
2 stops18h 10mMultiple Airlines
Tue 3/188:55 amLHR - ORD
1 stop13h 20mMultiple Airlines
Deal found 2/20$617
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/52:00 pmORD - LHR
1 stop14h 30mDelta
Mon 3/106:30 amLHR - ORD
1 stop14h 00mDelta
Deal found 2/19$622
This Bravofly 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 Bravofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/37:09 pmMDW - LHR
1 stop12h 01mVirgin Atlantic
Thu 4/2411:20 amLHR - MDW
1 stop12h 39mVirgin Atlantic
Deal found 2/20$622
This World Air Fares 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 World Air Fares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/12:55 pmMDW - LHR
1 stop12h 00mAir France
Tue 4/83:15 pmLHR - MDW
1 stop13h 06mAir France
Deal found 2/20$627

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 February 20, 2025.

Fly from

Illinois

Fly to

Heathrow

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 4/1

3:45 pm-8:00 am

1 stop10h 15m

London Heathrow

Tue 4/8

8:50 am-2:00 pm

1 stop11h 10m

$585

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 3/9

7:30 pm-8:15 am

Nonstop7h 45m

London Heathrow

Wed 3/19

11:00 am-2:55 pm

Nonstop8h 55m

$587

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 4/1

7:30 pm-8:20 pm

1 stop18h 50m

London Heathrow

Wed 4/23

9:25 pm-6:20 pm

1 stop26h 55m

$588

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 4/1

10:30 pm-12:15 pm

Nonstop7h 45m

London Heathrow

Wed 4/23

7:30 am-5:50 pm

1 stop16h 20m

$595

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 4/1

7:15 pm-5:40 pm

1 stop16h 25m

London Heathrow

Wed 4/23

9:05 pm-4:10 pm

2 stops25h 05m

$599

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 3/9

10:25 am-6:50 am

1 stop15h 25m

London Heathrow

Tue 3/18

9:00 am-4:05 pm

1 stop12h 05m

$605

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 3/8

3:40 pm-10:10 am

1 stop36h 30m

London Heathrow

Mon 3/17

1:45 pm-5:15 pm

1 stop32h 30m

$606

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 3/9

9:25 pm-9:35 pm

1 stop19h 10m

London Heathrow

Tue 3/18

6:30 pm-4:30 pm

1 stop27h 00m

$607

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Thu 4/3

7:09 pm-1:10 pm

1 stop12h 01m

London Heathrow

Thu 4/24

11:20 am-5:59 pm

1 stop12h 39m

$622

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 4/1

2:55 pm-8:55 am

1 stop12h 00m

London Heathrow

Tue 4/8

3:15 pm-10:21 pm

1 stop13h 06m

$627

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

Showing 1-10 of 57 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 $1,136). 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 February 20, 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 February 20, 2025.

The most flights from USIL to LHR 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 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 February 20, 2025.
To help decide which airline to fly from Illinois to London, see what other customers have to say about Delta, Alaska Airlines and KLM. 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
8,220 reviews

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

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

Delta
8.0
Very good
8,220 reviews
Delta
8.0
Very good
8,220 reviews

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

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

Alaska Airlines
8.0
Very good
9,692 reviews
Delta
8.0
Very good
8,220 reviews

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

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

KLM
7.8
Good
1,333 reviews
Delta
8.0
Very good
8,220 reviews

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

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

Finnair
7.6
Good
1,273 reviews
Delta
8.0
Very good
8,220 reviews

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

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

SWISS
7.5
Good
1,568 reviews
Delta
8.0
Very good
8,220 reviews

Food

7.3

Overall

8.0

Comfort

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

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 JetBlue. According to our data, you can fly for as low as $269. Users have also found prices from $296 and $351 on Icelandair 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 (80%), Air Canada (74%) or Austrian Airlines (74%) 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 $1,383, our data shows the cheapest flight currently is $393. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay $505 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 $1,136). 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
Hounslow
Hayes
Thornton Heath
Harrow
Luton
Wembley
Horley
Canterbury
Northampton
Gatwick
Milton Keynes
Dover
Orpington
Watford
Stratford-upon-Avon
Croydon
Borehamwood
Bromley
Folkestone
Ilford

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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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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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$381Average$576FlexibilityNo cancel feeOn-time77%
DeltaCheapest$451Average$882FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$464Average$592FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$506Average$812FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$516Average$679FlexibilityNo cancel feeOn-time62%
LufthansaCheapest$550Average$920FlexibilityNo cancel feeOn-time76%
Air CanadaCheapest$554Average$749FlexibilityNo cancel feeOn-time67%
FinnairCheapest$566Average$748FlexibilityNo cancel feeOn-time76%
SWISSCheapest$581Average$896FlexibilityNo cancel feeOn-time79%
IberiaCheapest$582Average$729FlexibilityNo cancel feeOn-time77%
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