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Heathrow

$320+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
Jun 25 — Jul 21
Thu 6/25
Thu 7/2
1 adult, Economy
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Cheap 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 May 26, 2026.

This Orbitz deal was found by Cheapflights users on 5/25. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/171:33 pm
CMI
-
LHR
1 stop14h 52m
Iberia
Tue 11/246:05 am
LHR
-
CMI
2 stops19h 20m
Iberia
Deal found 5/25$862
This Virgin Atlantic deal was found by Cheapflights users on 5/21. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/11:30 pm
EVV
-
LHR
1 stop11h 45m
Virgin Atlantic
Wed 9/309:55 am
LHR
-
EVV
2 stops18h 08m
Virgin Atlantic
Deal found 5/21$876
This Delta deal was found by Cheapflights users on 5/22. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/235:55 am
MLI
-
LHR
1 stop18h 30m
Delta
Wed 9/308:40 am
LHR
-
MLI
2 stops19h 50m
Delta
Deal found 5/22$876
This Delta deal was found by Cheapflights users on 5/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/236:00 am
BMI
-
LHR
1 stop18h 25m
Delta
Tue 9/158:40 am
LHR
-
BMI
2 stops19h 42m
Delta
Deal found 5/21$876
This KLM deal was found by Cheapflights users on 5/25. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/215:45 pm
EVV
-
LHR
1 stop11h 35m
KLM
Thu 11/56:30 am
LHR
-
EVV
2 stops16h 24m
KLM
Deal found 5/25$877
This KLM deal was found by Cheapflights users on 5/25. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/235:55 am
MLI
-
LHR
1 stop18h 30m
KLM
Wed 9/306:30 am
LHR
-
MLI
2 stops15h 59m
KLM
Deal found 5/25$877
This Cheapflightsfares deal was found by Cheapflights users on 5/25. 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.
Wed 7/294:30 pm
ORD
-
LHR
Nonstop8h 15m
Austrian Airlines
Thu 8/138:00 am
LHR
-
ORD
Nonstop9h 05m
Austrian Airlines
Deal found 5/25$880
This oojo deal was found by Cheapflights users on 5/21. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/199:15 pm
ORD
-
LHR
Nonstop8h 00m
British Airways
Tue 8/252:45 pm
LHR
-
ORD
Nonstop8h 50m
British Airways
Deal found 5/21$881
This Virgin Atlantic deal was found by Cheapflights users on 5/21. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/21:00 pm
MDW
-
LHR
2 stops14h 35m
Virgin Atlantic
Wed 11/116:30 am
LHR
-
MDW
2 stops21h 15m
Virgin Atlantic
Deal found 5/21$881
This Delta deal was found by Cheapflights users on 5/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/11:30 pm
EVV
-
LHR
2 stops16h 35m
Delta
Tue 9/296:30 am
LHR
-
EVV
2 stops16h 26m
Delta
Deal found 5/21$881
This Cheapflightsfares deal was found by Cheapflights users on 5/25. 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.
Thu 12/105:45 pm
ORD
-
LHR
Nonstop8h 10m
Multiple Airlines
Wed 12/166:30 am
LHR
-
ORD
1 stop12h 40m
Multiple Airlines
Deal found 5/25$882
This FlightHub deal was found by Cheapflights users on 5/25. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/236:45 pm
PIA
-
LHR
1 stop10h 30m
British Airways
Tue 9/156:15 am
LHR
-
PIA
2 stops22h 48m
British Airways
Deal found 5/25$882

Find flight deals from Illinois to Heathrow

Keep the following information in mind while searching for Illinois to Heathrow flight deals. Data was last updated May 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$862
(Orbitz)

One-way from

$320
(Cheapflightsfares)

Popular in

June

Cheapest in

February

Average price

$936

Good round-trip deal

$992 or less

Good one-way deal

$505 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. 26% potential increase in price ($279 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($48 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
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.
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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 May 26, 2026.
Use the filters below to find and compare flights from Illinois to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

EvansvilleLondon

EVV - LHR

EVVLHR

Evansville Dress Regional

Tue 9/1

10:05 am-7:15 am

1 stop15h 10m

London Heathrow

Tue 9/29

8:40 am-10:03 pm

2 stops19h 23m

$876

BloomingtonLondon

BMI - LHR

BMILHR

Bloomington-Normal

Sun 8/23

12:09 pm-11:20 am

1 stop17h 11m

London Heathrow

Tue 9/15

6:30 am-10:22 pm

2 stops21h 52m

$876

EvansvilleLondon

EVV - LHR

EVVLHR

Evansville Dress Regional

Wed 10/21

5:45 pm-11:20 am

1 stop11h 35m

London Heathrow

Thu 11/5

6:30 am-4:54 pm

2 stops16h 24m

$877

MolineLondon

MLI - LHR

MLILHR

Moline Quad-City

Wed 9/23

11:09 am-11:20 am

1 stop18h 11m

London Heathrow

Wed 9/30

6:30 am-4:29 pm

2 stops15h 59m

$877

MolineLondon

MLI - LHR

MLILHR

Moline Quad-City

Wed 9/23

6:00 am-6:25 am

1 stop18h 25m

London Heathrow

Wed 9/30

8:40 am-10:24 pm

2 stops19h 44m

$877

EvansvilleLondon

EVV - LHR

EVVLHR

Evansville Dress Regional

Wed 10/21

10:05 am-6:20 am

2 stops14h 15m

London Heathrow

Thu 11/5

8:40 am-10:03 pm

2 stops19h 23m

$881

PeoriaLondon

PIA - LHR

PIALHR

Greater Peoria

Sun 8/23

6:45 pm-11:15 am

1 stop10h 30m

London Heathrow

Tue 9/15

7:25 pm-11:03 pm

2 stops33h 38m

$886

EvansvilleLondon

EVV - LHR

EVVLHR

Evansville Dress Regional

Tue 9/1

1:58 pm-12:50 pm

1 stop16h 52m

London Heathrow

Wed 9/30

1:10 pm-11:21 pm

1 stop16h 11m

$895

EvansvilleLondon

EVV - LHR

EVVLHR

Evansville Dress Regional

Wed 10/21

6:06 pm-11:15 am

1 stop11h 09m

London Heathrow

Thu 11/5

11:00 am-11:30 pm

1 stop18h 30m

$895

MolineLondon

MLI - LHR

MLILHR

Moline Quad-City

Wed 9/23

6:00 am-6:50 am

1 stop18h 50m

London Heathrow

Wed 9/30

1:10 pm-12:05 am

1 stop16h 55m

$895

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/24

Showing 1-10 of 60 resultsSorted by cheapest first
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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, January is the cheapest month in which you can book a flight from Illinois to London Heathrow Airport (average of $200). Flying from Illinois to London Heathrow Airport in April is currently the most expensive (average of $1,763). 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 May 26, 2026.

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 May 26, 2026.

The most flights from USIL to LHR are scheduled on a Monday (56 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (41 on average).

How much does it cost to fly round-trip from Illinois to London Heathrow Airport?

How far ahead should I book a flight from Illinois to London Heathrow Airport?

The best time to book flights from Illinois to London Heathrow Airport is 90 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your 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.

  • How long is the flight from Illinois to London Heathrow Airport?

    For as low as $877, Delta can have you in London Heathrow Airport from Illinois in 11h 35m. There are 4111 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 $135. Users have also found prices from $219 and $292 on Icelandair and Brussels 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 Air Canada (82%), Austrian Airlines (82%) or United Airlines (82%) 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 $2,458, our data shows the cheapest flight currently is $374. When looking at the most popular route, (Chicago O'Hare Intl - London Heathrow), you can expect to pay $642 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, January is the cheapest month in which you can book a flight from Illinois to London Heathrow Airport (average of $200). Flying from Illinois to London Heathrow Airport in April is currently the most expensive (average of $1,763). 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
Ilford
Dorking
Hounslow
Winchester
Croydon
Gatwick
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Orpington
Watford
Northampton
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
Slough
Stansted

Browse thousands of different options on Cheapflights for your next trip

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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 May 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$81FlexibilityNo cancel feeOn-time62%
Scandinavian AirlinesCheapest$321Average$581FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$428Average$689FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$481Average$579FlexibilityNo cancel feeOn-time76%
FinnairCheapest$516Average$851FlexibilityNo cancel feeOn-time76%
Alaska AirlinesCheapest$522Average$809FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$527Average$761FlexibilityNo cancel feeOn-time70%
SWISSCheapest$562Average$747FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$574Average$902FlexibilityNo cancel feeOn-time69%
Aer LingusCheapest$579Average$871FlexibilityNo cancel feeOn-timeN/A

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