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$283+ 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 7/21. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
jul. 8 — jul. 151
mar. 7/8
mar. 7/15
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 julio 3, 2025.

Round-trip from

$619
(Justfly.com)

One-way from

$283
(Mytrip)

Popular in

June

Cheapest in

February

Average price

$1,034

Good round-trip deal

$670 or less

Good one-way deal

$487 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 ($207 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).
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Average for round-trip flights in July 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 julio 3, 2025.

This Justfly.com deal was found by Cheapflights users on 7/2. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/196:39 pmPIA - LHR
1 stop10h 26mBritish Airways
mar. 8/266:10 amLHR - PIA
2 stops17h 59mBritish Airways
Deal found 7/2$619
This United Airlines deal was found by Cheapflights users on 7/2. 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.
dom. 8/103:45 pmMLI - LHR
1 stop14h 00mUnited Airlines
mar. 9/302:05 pmLHR - MLI
2 stops31h 00mUnited Airlines
Deal found 7/2$631
This United Airlines deal was found by Cheapflights users on 7/2. 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. 8/195:19 pmPIA - LHR
2 stops31h 11mUnited Airlines
mar. 8/269:30 amLHR - PIA
2 stops30h 43mUnited Airlines
Deal found 7/2$631
This Delta deal was found by Cheapflights users on 7/3. 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. 8/105:55 amMLI - LHR
1 stop19h 20mDelta
mar. 9/301:05 pmLHR - MLI
1 stop15h 37mDelta
Deal found 7/3$654
This American Airlines deal was found by Cheapflights users on 7/1. 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.
mié. 10/12:51 pmBMI - LHR
1 stop15h 24mAmerican Airlines
mié. 10/153:10 pmLHR - BMI
1 stop14h 09mAmerican Airlines
Deal found 7/1$654
This American Airlines deal was found by Cheapflights users on 7/3. 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.
sáb. 7/269:15 pmORD - LHR
Nonstop7h 50mAmerican Airlines
lun. 8/118:15 amLHR - ORD
1 stop13h 30mAmerican Airlines
Deal found 7/3$655
This Cheapflightsfares deal was found by Cheapflights users on 7/2. 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. 8/58:15 pmORD - LHR
Nonstop8h 05mBritish Airways
mié. 8/133:30 pmLHR - ORD
Nonstop8h 45mBritish Airways
Deal found 7/2$656
This Scandinavian Airlines deal was found by Cheapflights users on 7/2. 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.
mar. 11/257:00 amORD - LHR
2 stops20h 20mScandinavian Airlines
mar. 12/27:30 pmLHR - ORD
1 stop27h 15mScandinavian Airlines
Deal found 7/2$657
This United Airlines deal was found by Cheapflights users on 7/1. 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. 11/255:50 pmORD - LHR
Nonstop8h 05mUnited Airlines
mar. 12/28:55 amLHR - ORD
1 stop13h 20mUnited Airlines
Deal found 7/1$658
This Virgin Atlantic deal was found by Cheapflights users on 7/1. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 11/41:00 pmMDW - LHR
2 stops11h 55mVirgin Atlantic
mar. 11/1811:30 amLHR - MDW
2 stops16h 14mVirgin Atlantic
Deal found 7/1$658
This Kiwi.com deal was found by Cheapflights users on 7/2. 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.
jue. 8/79:15 pmORD - LHR
1 stop10h 10mAer Lingus
jue. 8/288:50 amLHR - ORD
1 stop11h 10mAer Lingus
Deal found 7/2$659
This Delta deal was found by Cheapflights users on 7/3. 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.
mié. 10/13:39 pmBMI - LHR
2 stops13h 46mDelta
mié. 10/159:20 amLHR - BMI
1 stop19h 02mDelta
Deal found 7/3$659

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 julio 3, 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

PeoriaLondon

PIA - LHR

PIALHR

Greater Peoria

mar. 8/19

6:39 pm-11:05 am

1 stop10h 26m

London Heathrow

mar. 8/26

6:10 am-6:09 pm

2 stops17h 59m

$619

MolineLondon

MLI - LHR

MLILHR

Moline Quad-City

dom. 8/10

3:45 pm-11:45 am

1 stop14h 00m

London Heathrow

mar. 9/30

2:05 pm-3:05 pm

2 stops31h 00m

$631

PeoriaLondon

PIA - LHR

PIALHR

Greater Peoria

mar. 8/19

5:19 pm-6:30 am

2 stops31h 11m

London Heathrow

mar. 8/26

9:30 am-10:13 am

2 stops30h 43m

$631

MolineLondon

MLI - LHR

MLILHR

Moline Quad-City

dom. 8/10

5:55 am-7:15 am

1 stop19h 20m

London Heathrow

mar. 9/30

1:05 pm-10:42 pm

1 stop15h 37m

$654

BloomingtonLondon

BMI - LHR

BMILHR

Bloomington-Normal

mié. 10/1

2:51 pm-12:15 pm

1 stop15h 24m

London Heathrow

mié. 10/15

3:10 pm-11:19 pm

1 stop14h 09m

$654

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

sáb. 7/26

9:15 pm-11:05 am

Nonstop7h 50m

London Heathrow

lun. 8/11

8:15 am-3:45 pm

1 stop13h 30m

$655

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mar. 8/5

8:15 pm-10:20 am

Nonstop8h 05m

London Heathrow

mié. 8/13

3:30 pm-6:15 pm

Nonstop8h 45m

$656

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

dom. 7/20

4:30 pm-2:55 pm

1 stop16h 25m

London Heathrow

mar. 8/19

6:15 pm-8:10 pm

2 stops31h 55m

$658

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

mar. 8/26

10:31 am-6:45 am

2 stops14h 14m

London Heathrow

mar. 9/2

6:15 am-9:26 pm

2 stops21h 11m

$658

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

jue. 8/7

9:15 pm-1:25 pm

1 stop10h 10m

London Heathrow

jue. 8/28

8:50 am-2:00 pm

1 stop11h 10m

$659

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 56 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 $1,098). 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 julio 3, 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 julio 3, 2025.

The most flights from USIL to LHR are scheduled on a Wednesday (57 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (37 on average).

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 julio 3, 2025.
Read reviews from past customers who have flown Delta, KLM, and Austrian Airlines from Illinois to London Heathrow Airport. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,367 reviews
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Austrian Airlines
7.6
Good
809 reviews
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Finnair
7.6
Good
1,306 reviews
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air France
7.5
Good
1,465 reviews
Delta
8.0
Very good
7,982 reviews

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 Scandinavian Airlines. According to our data, you can fly for as low as $352. Users have also found prices from $365 and $370 on Icelandair and JetBlue, 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 (70%), Air Canada (67%) or Austrian Airlines (67%) 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 $2,683, our data shows the cheapest flight currently is $370. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay $330 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 $1,098). 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
Canterbury
Harrow
Dover
Stratford-upon-Avon
Gatwick
Orpington
Watford
Northampton
Croydon
Folkestone
Borehamwood
Broadway
Aylesbury
Chelmsford
Brentwood
Chichester
Swindon

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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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Los Angeles to London City flights
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O'Hare Intl to London City flights
Los Angeles to Gatwick flights
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San Francisco to Gatwick flights
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San Francisco to London City flights
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Minneapolis to Heathrow flights
Newark to Luton flights
Seattle to London City flights
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Midway to Heathrow flights
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Hobby to Gatwick 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 julio 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
SWISSCheapest$257Average$671FlexibilityNo cancel feeOn-time79%
DeltaCheapest$345Average$837FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$381Average$600FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$430Average$917FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$465Average$589FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$507Average$792FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$516Average$869FlexibilityNo cancel feeOn-time62%
Aer LingusCheapest$543Average$800FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$569Average$753FlexibilityNo cancel feeOn-time76%
IberiaCheapest$581Average$744FlexibilityNo cancel feeOn-time77%

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