HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Heathrow

$276+ 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 4/30. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
Apr 6 — Apr 131
Sun 4/6
Sun 4/13
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 April 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$595
(Flightnetwork)

One-way from

$276
(Mytrip)

Popular in

June

Cheapest in

February

Average price

$672

Good round-trip deal

$668 or less

Good one-way deal

$488 or less
Provider with most accurate pricing for Chicago (CHI)-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-London (LON) flights.
Search Deals
From Illinois to London Heathrow
Search Deals
One-way flight from Illinois to London Heathrow
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($172 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 1, 2025.

This Flightnetwork deal was found by Cheapflights users on 3/30. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/47:15 pmORD - LHR
2 stops15h 45mScandinavian Airlines
Mon 5/196:40 amLHR - ORD
1 stop15h 30mScandinavian Airlines
Deal found 3/30$595
This Iberia deal was found by Cheapflights users on 3/31. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/72:55 pmORD - LHR
1 stop11h 10mIberia
Tue 4/152:25 pmLHR - ORD
Nonstop8h 35mIberia
Deal found 3/31$597
This eDestinos deal was found by Cheapflights users on 3/31. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/68:30 pmORD - LHR
Nonstop8h 00mBritish Airways
Wed 5/141:10 pmLHR - ORD
Nonstop8h 45mBritish Airways
Deal found 3/31$606
This United Airlines deal was found by Cheapflights users on 3/31. 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 4/162:35 pmORD - LHR
1 stop15h 45mUnited Airlines
Mon 4/2112:10 pmLHR - ORD
1 stop30h 00mUnited Airlines
Deal found 3/31$608
This Booking.com deal was found by Cheapflights users on 3/31. 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.
Sun 4/69:15 pmORD - LHR
1 stop10h 40mAer Lingus
Tue 4/157:40 amLHR - ORD
1 stop12h 20mAer Lingus
Deal found 3/31$612
This Finnair deal was found by Cheapflights users on 3/31. 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.
Wed 5/1410:25 pmORD - LHR
Nonstop7h 50mFinnair
Wed 5/219:30 amLHR - ORD
1 stop14h 20mFinnair
Deal found 3/31$615
This SWISS deal was found by Cheapflights users on 3/31. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/222:20 pmORD - LHR
1 stop25h 25mSWISS
Mon 4/285:10 pmLHR - ORD
1 stop28h 45mSWISS
Deal found 3/31$621
This Kiwi.com deal was found by Cheapflights users on 3/31. 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.
Mon 4/287:25 pmORD - LHR
1 stop10h 30mMultiple Airlines
Mon 5/510:15 pmLHR - ORD
2 stops26h 02mMultiple Airlines
Deal found 3/31$623
This American Airlines deal was found by Cheapflights users on 3/31. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/78:20 pmORD - LHR
Nonstop8h 10mAmerican Airlines
Tue 4/151:10 pmLHR - ORD
Nonstop8h 45mAmerican Airlines
Deal found 3/31$625
This oojo deal was found by Cheapflights users on 3/31. 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.
Fri 4/2510:15 pmORD - LHR
1 stop16h 05mIcelandair
Mon 4/289:25 pmLHR - ORD
1 stop26h 50mIcelandair
Deal found 3/31$630
This Austrian Airlines deal was found by Cheapflights users on 3/31. 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.
Sun 4/274:20 pmORD - LHR
1 stop34h 00mAustrian Airlines
Mon 5/510:25 amLHR - ORD
1 stop32h 55mAustrian Airlines
Deal found 3/31$633
This JetBlue deal was found by Cheapflights users on 3/31. 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.
Wed 10/158:40 amORD - LHR
1 stop15h 50mJetBlue
Tue 10/288:25 amLHR - ORD
1 stop14h 02mJetBlue
Deal found 3/31$643

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 April 1, 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 5/4

7:15 pm-5:00 pm

2 stops15h 45m

London Heathrow

Mon 5/19

6:40 am-4:10 pm

1 stop15h 30m

$595

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 8/6

8:35 pm-10:30 am

Nonstop7h 55m

London Heathrow

Wed 8/13

11:05 am-1:50 pm

Nonstop8h 45m

$599

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 5/6

8:30 pm-10:30 am

Nonstop8h 00m

London Heathrow

Wed 5/14

1:10 pm-3:55 pm

Nonstop8h 45m

$606

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 4/16

2:35 pm-12:20 pm

1 stop15h 45m

London Heathrow

Mon 4/21

12:10 pm-12:10 pm

1 stop30h 00m

$608

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 5/14

10:25 pm-12:15 pm

Nonstop7h 50m

London Heathrow

Wed 5/21

9:30 am-5:50 pm

1 stop14h 20m

$615

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 4/22

2:20 pm-9:45 pm

1 stop25h 25m

London Heathrow

Mon 4/28

5:10 pm-3:55 pm

1 stop28h 45m

$621

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 4/28

7:25 pm-11:55 am

1 stop10h 30m

London Heathrow

Mon 5/5

10:15 pm-6:17 pm

2 stops26h 02m

$623

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 5/11

3:45 pm-9:05 am

1 stop11h 20m

London Heathrow

Fri 5/23

7:40 am-2:00 pm

1 stop12h 20m

$624

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 4/30

3:10 pm-9:05 am

1 stop11h 55m

London Heathrow

Fri 5/9

1:10 pm-3:55 pm

Nonstop8h 45m

$626

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 4/25

10:15 pm-8:20 pm

1 stop16h 05m

London Heathrow

Mon 4/28

9:25 pm-6:15 pm

1 stop26h 50m

$630

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 60 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 $1,110). 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 April 1, 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 April 1, 2025.

The most flights from USIL to LHR are scheduled on a Monday (57 on average). You will have fewer flight options on Friday, 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 April 1, 2025.
To help decide which airline to fly from Illinois to London, see what other customers have to say about Delta, KLM and Finnair. 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
7,899 reviews

Comfort

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
7,899 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
1,321 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
1,267 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
1,570 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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.
Air France
7.4
Good
1,425 reviews
Delta
8.0
Very good
7,899 reviews

Comfort

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Overall

8.0

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 TAP AIR PORTUGAL. According to our data, you can fly for as low as $277. Users have also found prices from $297 and $369 on Icelandair and Scandinavian Airlines, 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 (87%), Air Canada (80%) or Austrian Airlines (80%) 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 $2,915, our data shows the cheapest flight currently is $408. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay $453 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 $1,110). 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
Luton
Wembley
Harrow
Horley
Canterbury
Dover
Gatwick
Orpington
Watford
Milton Keynes
Northampton
Stratford-upon-Avon
Croydon
Borehamwood
Folkestone
Ilford
Broadway

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 Gatwick flights
Los Angeles to Heathrow flights
John F Kennedy Intl to London City flights
LaGuardia to Heathrow flights
Boston to Heathrow flights
Dulles Intl to Heathrow flights
Newark to Gatwick flights
O'Hare Intl to Heathrow flights
San Francisco to Heathrow flights
Seattle to Heathrow flights
Baltimore to Heathrow flights
Dallas/Fort Worth to Heathrow flights
Newark to London City flights
Stewart to Stansted flights
Atlanta to Heathrow flights
Boston to Gatwick flights
Denver to Heathrow flights
LaGuardia to Gatwick flights
Miami to Heathrow flights
Reagan-National to Heathrow flights
Orlando to Heathrow flights
Dulles Intl to Gatwick flights
Boston to London City flights
Los Angeles to London City flights
John F Kennedy Intl to Stansted flights
Dulles Intl to London City flights
Hobby to Heathrow flights
Reagan-National to Gatwick flights
Baltimore to Gatwick flights
Philadelphia to Heathrow flights
George Bush Intcntl to Heathrow flights
Sky Harbor Intl to Heathrow flights
San Francisco to Gatwick flights
O'Hare Intl to Gatwick flights
San Francisco to London City flights
Boston to Stansted flights
O'Hare Intl to London City flights
Minneapolis to Heathrow flights
Los Angeles to Gatwick flights
Tampa to Heathrow flights
Portland to Heathrow flights
Seattle to Gatwick flights
John F Kennedy Intl to Luton flights
Charlotte to Heathrow flights
Orlando to Gatwick flights
Raleigh to Heathrow flights
Seattle to London City flights
Detroit 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 April 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
SWISSCheapest$257Average$695FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$381Average$600FlexibilityNo cancel feeOn-time77%
IcelandairCheapest$468Average$592FlexibilityNo cancel feeOn-time76%
LufthansaCheapest$502Average$922FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$506Average$765FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$516Average$679FlexibilityNo cancel feeOn-time62%
Air CanadaCheapest$554Average$739FlexibilityNo cancel feeOn-time67%
FinnairCheapest$564Average$723FlexibilityNo cancel feeOn-time76%
DeltaCheapest$578Average$882FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$580Average$717FlexibilityNo 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.