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$237+ 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 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
dic. 5 — dic. 121
vie. 12/5
vie. 12/12
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 noviembre 5, 2025.

This KAYAK deal was found by Cheapflights users on 11/3. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/87:10 amORD - LHR
2 stops20h 10mScandinavian Airlines
lun. 12/156:40 amLHR - ORD
1 stop16h 05mScandinavian Airlines
Deal found 11/3$541
This KAYAK deal was found by Cheapflights users on 11/2. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/156:30 pmORD - LHR
1 stop10h 20mIcelandair
mar. 11/2512:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 11/2$542
This Mytrip deal was found by Cheapflights users on 11/4. 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.
lun. 11/177:20 pmORD - LHR
2 stops15h 40mScandinavian Airlines
sáb. 11/225:30 pmLHR - ORD
2 stops29h 15mScandinavian Airlines
Deal found 11/4$543
This Cheapflightsfares deal was found by Cheapflights users on 11/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/87:20 pmORD - LHR
1 stop20h 20mScandinavian Airlines
jue. 12/116:40 amLHR - ORD
1 stop16h 05mScandinavian Airlines
Deal found 11/3$544
This oojo deal was found by Cheapflights users on 11/4. 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.
mar. 11/116:30 pmORD - LHR
1 stop19h 00mIcelandair
mar. 11/2512:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 11/4$545
This oojo deal was found by Cheapflights users on 11/5. 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.
mié. 11/126:30 pmORD - LHR
1 stop19h 00mIcelandair
mié. 11/198:35 pmLHR - ORD
1 stop26h 45mIcelandair
Deal found 11/5$546
This oojo deal was found by Cheapflights users on 11/3. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/227:20 pmORD - LHR
2 stops15h 05mScandinavian Airlines
mié. 11/2610:35 amLHR - ORD
2 stops36h 10mScandinavian Airlines
Deal found 11/3$547
This Gotogate deal was found by Cheapflights users on 11/3. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/97:40 pmORD - LHR
1 stop9h 45mAer Lingus
mar. 11/1812:10 pmLHR - ORD
1 stop11h 45mAer Lingus
Deal found 11/3$548
This oojo deal was found by Cheapflights users on 11/4. 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.
vie. 12/58:15 pmORD - LHR
1 stop20h 25mTAP AIR PORTUGAL
dom. 12/76:00 amLHR - ORD
1 stop14h 45mTAP AIR PORTUGAL
Deal found 11/4$551
This Mytrip deal was found by Cheapflights users on 11/4. 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.
dom. 11/306:30 pmORD - LHR
2 stops20h 35mMultiple Airlines
vie. 12/57:50 amLHR - ORD
2 stops15h 30mMultiple Airlines
Deal found 11/4$552
This Cheapflightsfares deal was found by Cheapflights users on 11/4. 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.
lun. 12/17:20 pmORD - LHR
1 stop20h 20mScandinavian Airlines
dom. 12/710:20 amLHR - ORD
1 stop12h 25mScandinavian Airlines
Deal found 11/4$553
This Netflights deal was found by Cheapflights users on 11/5. 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 Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/36:07 amEVV - LHR
1 stop19h 43mVirgin Atlantic
mié. 12/1010:45 amLHR - EVV
1 stop12h 26mVirgin Atlantic
Deal found 11/5$556

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 noviembre 5, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$536
(Scandinavian Airlines)

One-way from

$237
(Trip.com)

Popular in

June

Cheapest in

February

Average price

$692

Good round-trip deal

$713 or less

Good one-way deal

$439 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 ($201 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 November 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 noviembre 5, 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

sáb. 12/6

7:10 am-9:20 am

2 stops20h 10m

London Heathrow

vie. 12/12

6:40 am-4:45 pm

1 stop16h 05m

$559

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mar. 1/20

10:24 am-4:00 pm

2 stops23h 36m

London Heathrow

mar. 1/27

7:50 pm-4:45 pm

2 stops26h 55m

$562

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mié. 11/19

7:10 am-6:50 am

1 stop17h 40m

London Heathrow

mié. 12/3

8:55 am-3:10 pm

1 stop12h 15m

$580

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

dom. 11/23

8:55 am-6:50 am

2 stops15h 55m

London Heathrow

mié. 12/3

6:20 am-3:10 pm

1 stop14h 50m

$584

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

lun. 11/24

1:47 pm-7:05 am

1 stop11h 18m

London Heathrow

mar. 12/2

8:55 am-4:18 pm

1 stop13h 23m

$585

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

lun. 12/1

1:47 pm-7:05 am

1 stop11h 18m

London Heathrow

mar. 12/9

6:20 am-6:00 pm

2 stops17h 40m

$589

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

mié. 12/3

1:50 pm-7:05 am

1 stop11h 15m

London Heathrow

mié. 12/10

6:20 am-6:00 pm

2 stops17h 40m

$589

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mar. 11/18

1:14 pm-6:25 am

1 stop11h 11m

London Heathrow

mar. 11/25

6:20 am-4:24 pm

2 stops16h 04m

$590

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

jue. 1/15

12:00 pm-6:30 pm

2 stops24h 30m

London Heathrow

lun. 1/26

6:40 am-11:39 pm

2 stops22h 59m

$599

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mar. 11/18

9:05 pm-11:15 am

Nonstop8h 10m

London Heathrow

mié. 12/3

6:35 am-2:10 pm

1 stop13h 35m

$602

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/4

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 $399). 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 noviembre 5, 2025.

It’s optimal to fly from Illinois to London Heathrow Airport in the evening. By choosing this option you can save up to 45% on the cost of your flight, compared to a flight in the morning.

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.

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 noviembre 5, 2025.

The most flights from USIL to LHR are scheduled on a Wednesday (45 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (40 on average).

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 $622, Scandinavian Airlines can have you in London Heathrow Airport from Illinois in 14h 05m. There are 4186 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 $279. Users have also found prices from $379 and $403 on Lufthansa and KLM, 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 Gulf Air (75%), Malaysia Airlines (72%) or Air Canada (70%) 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 $2,667, our data shows the cheapest flight currently is $396. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay $429 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 $399). 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 noviembre 5, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$625FlexibilityNo cancel feeOn-time62%
SWISSCheapest$257Average$594FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$338Average$569FlexibilityNo cancel feeOn-time77%
DeltaCheapest$345Average$870FlexibilityNo cancel feeOn-timeN/A
TAP AIR PORTUGALCheapest$450Average$644FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$460Average$947FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$481Average$610FlexibilityNo cancel feeOn-time76%
Alaska AirlinesCheapest$487Average$677FlexibilityNo cancel feeOn-time75%
Aer LingusCheapest$515Average$818FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$542Average$793FlexibilityNo cancel feeOn-time76%

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