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$234+ 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
Nov 22 — Nov 291
Sat 11/22
Sat 11/29
1 adult, Economy
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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 October 23, 2025.

This oojo deal was found by Cheapflights users on 10/23. 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.
Tue 11/256:30 pmORD - LHR
1 stop10h 20mIcelandair
Tue 12/28:35 pmLHR - ORD
1 stop26h 45mIcelandair
Deal found 10/23$532
This Cheapflightsfares deal was found by Cheapflights users on 10/21. 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.
Mon 12/87:10 amORD - LHR
2 stops20h 10mScandinavian Airlines
Mon 12/156:40 amLHR - ORD
1 stop16h 05mScandinavian Airlines
Deal found 10/21$537
This Gotogate deal was found by Cheapflights users on 10/21. 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.
Wed 12/316:30 pmORD - LHR
1 stop19h 00mIcelandair
Thu 1/1512:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 10/21$538
This CrystalTravel deal was found by Cheapflights users on 10/22. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/77:20 pmORD - LHR
1 stop20h 20mScandinavian Airlines
Sun 12/146:40 amLHR - ORD
2 stops16h 05mScandinavian Airlines
Deal found 10/22$541
This Mytrip deal was found by Cheapflights users on 10/22. 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.
Wed 12/37:20 pmORD - LHR
2 stops31h 35mScandinavian Airlines
Sat 12/66:40 amLHR - ORD
1 stop16h 05mScandinavian Airlines
Deal found 10/22$544
This KAYAK deal was found by Cheapflights users on 10/23. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/66:30 pmORD - LHR
1 stop19h 00mIcelandair
Mon 3/912:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 10/23$545
This Rumbo deal was found by Cheapflights users on 10/21. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/264:05 pmORD - LHR
1 stop11h 55mVirgin Atlantic
Tue 11/49:00 amLHR - ORD
1 stop12h 10mVirgin Atlantic
Deal found 10/21$546
This Mytrip deal was found by Cheapflights users on 10/23. 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.
Mon 11/176:30 pmORD - LHR
1 stop19h 00mIcelandair
Thu 12/2512:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 10/23$547
This lastminute.com deal was found by Cheapflights users on 10/22. 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 10/271:26 pmORD - LHR
1 stop11h 59mVirgin Atlantic
Tue 11/49:00 amLHR - ORD
1 stop12h 10mVirgin Atlantic
Deal found 10/22$548
This Scandinavian Airlines deal was found by Cheapflights users on 10/22. 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.
Fri 11/77:20 pmORD - LHR
2 stops31h 35mScandinavian Airlines
Mon 11/107:05 amLHR - ORD
2 stops15h 40mScandinavian Airlines
Deal found 10/22$550
This CrystalTravel deal was found by Cheapflights users on 10/21. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/37:20 pmORD - LHR
2 stops15h 05mScandinavian Airlines
Sun 12/76:40 amLHR - ORD
2 stops16h 05mScandinavian Airlines
Deal found 10/21$551
This Gotogate deal was found by Cheapflights users on 10/21. 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.
Mon 11/173:50 pmORD - LHR
1 stop10h 15mAer Lingus
Wed 11/267:50 amLHR - ORD
1 stop12h 10mAer Lingus
Deal found 10/21$552

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 October 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$532
(oojo)

One-way from

$234
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$670

Good round-trip deal

$691 or less

Good one-way deal

$449 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. 21% potential increase in price ($202 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 October 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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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 October 23, 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

Fri 11/7

7:20 pm-8:55 am

2 stops31h 35m

London Heathrow

Mon 11/10

7:05 am-4:45 pm

2 stops15h 40m

$550

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 1/13

10:40 am-5:40 pm

2 stops25h 00m

London Heathrow

Sun 1/18

6:40 am-4:55 pm

2 stops16h 15m

$566

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 11/18

10:35 am-6:30 pm

2 stops25h 55m

London Heathrow

Mon 11/24

7:05 am-4:45 pm

2 stops15h 40m

$576

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 11/5

4:56 pm-8:45 am

1 stop9h 49m

London Heathrow

Wed 11/12

9:00 am-3:10 pm

1 stop12h 10m

$582

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 10/27

1:08 pm-10:15 am

1 stop16h 07m

London Heathrow

Tue 11/4

9:00 am-3:10 pm

1 stop12h 10m

$583

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 11/5

5:51 pm-11:40 am

1 stop11h 49m

London Heathrow

Tue 11/11

8:55 am-3:10 pm

1 stop12h 15m

$583

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 10/28

6:10 pm-6:55 am

Nonstop7h 45m

London Heathrow

Tue 11/4

11:00 am-1:50 pm

Nonstop8h 50m

$586

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 12/2

4:06 pm-9:40 am

1 stop11h 34m

London Heathrow

Tue 12/9

11:00 am-1:50 pm

Nonstop8h 50m

$590

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 12/5

7:20 pm-8:55 am

2 stops31h 35m

London Heathrow

Fri 12/12

6:40 am-4:45 pm

1 stop16h 05m

$591

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 11/19

1:25 pm-6:20 am

1 stop10h 55m

London Heathrow

Thu 12/4

9:00 am-3:10 pm

1 stop12h 10m

$593

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/22

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, May is the cheapest month in which you can book a flight from Illinois to London Heathrow Airport (average of $396). Flying from Illinois to London Heathrow Airport in June is currently the most expensive (average of $901). 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 October 23, 2025.

It’s optimal to fly from Illinois to London Heathrow Airport in the evening. By choosing this option you can save up to 41% on the cost of your flight, compared to a flight in the afternoon.

What is the cheapest day to fly from Illinois to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from Illinois to Heathrow. Price data was last updated on November 18, 2024.

Travelers seeking maximum savings on their Illinois to London Heathrow Airport flight should consider departing on Friday evenings when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 $593, Scandinavian Airlines can have you in London Heathrow Airport from Illinois in 13h 30m. There are 3942 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 $270. Users have also found prices from $344 and $389 on Scandinavian Airlines and Virgin Atlantic, 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 (80%), SriLankan Airlines (74%) or Gulf Air (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 $2,566, 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 $440 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, May is the cheapest month in which you can book a flight from Illinois to London Heathrow Airport (average of $396). Flying from Illinois to London Heathrow Airport in June is currently the most expensive (average of $901). 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
Ilford
Hayes
Southend-on-Sea
Harrow
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Northampton
Gatwick
Borehamwood
Broadway
Aylesbury
Bedford
Chipping Norton
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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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 October 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$636FlexibilityNo cancel feeOn-time62%
SWISSCheapest$257Average$626FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$338Average$566FlexibilityNo cancel feeOn-time77%
DeltaCheapest$345Average$914FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$430Average$947FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$450Average$660FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$479Average$607FlexibilityNo cancel feeOn-time76%
Alaska AirlinesCheapest$487Average$677FlexibilityNo cancel feeOn-time75%
Aer LingusCheapest$502Average$824FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$543Average$791FlexibilityNo cancel feeOn-time76%

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