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

For as low as £653, Scandinavian Airlines can have you in London Heathrow Airport from Illinois in 8h 25m. The distance from Illinois to London Heathrow Airport is about 3939 mi. This flight may include one or multiple stops.

What are the cheapest airlines to fly from Illinois to London Heathrow Airport one-way?

The cheapest airline one-way is Lufthansa, with whom users have recently found tickets for as low as £285. However, be on the lookout for offers from Iberia and British Airways, as they are both options that can get you from Illinois to London Heathrow Airport for a low price.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

What are the most popular routes from Illinois to London Heathrow Airport?

The most popular route from Illinois to London Heathrow Airport is Chicago O'Hare Intl - London Heathrow. You may also consider Chicago Midway - London Heathrow or Lambert-St Louis - London Heathrow.

What are the cheapest flights from Illinois to London Heathrow Airport?

On average you can expect to pay £668 for a flight from Illinois to London Heathrow Airport. The cheapest flight overall is £275 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £268.

What are the most reliable airlines from Illinois to London Heathrow Airport?

No one likes to see their flight delayed. When booking a flight from Illinois to London Heathrow Airport consider choosing Royal Jordanian (80%), Aer Lingus (74%) or Malaysia Airlines (73%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from Illinois to London Heathrow Airport?

Consider British Airways, Aer Lingus or United Airlines when booking your flight. These represent the most popular airlines when flying from Illinois to London Heathrow Airport.

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 holiday 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.

£245+ Cheap Flights from Illinois to London Heathrow Airport

Cheap flight deals from Illinois to Heathrow

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

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 12 October 2026.

Fri 13/1119:10 -

1 stop14h 50m

Thu 19/1106:40 -

1 stop16h 05m

Deal found 11/10£545

Fri 25/1219:10 -

1 stop14h 50m

Mon 28/1210:20 -

1 stop12h 25m

Deal found 8/10£545

Mon 9/1118:30 -

1 stop10h 20m

Mon 16/1112:15 -

1 stop35h 05m

Deal found 9/10£546

Mon 7/1219:10 -

2 stops20h 25m

Fri 11/1217:00 -

2 stops34h 56m

Deal found 12/10£547

Sun 8/1119:10 -

2 stops15h 15m

Tue 17/1106:40 -

1 stop16h 05m

Deal found 8/10£548

Tue 1/1206:21 -

3 stops29h 19m

Mon 7/1206:40 -

3 stops28h 21m

Deal found 8/10£549

Sat 5/1219:10 -

3 stops19h 55m

Thu 10/1212:10 -

2 stops34h 35m

Deal found 9/10£550

Mon 2/1119:10 -

3 stops20h 10m

Thu 12/1107:05 -

2 stops15h 40m

Deal found 7/10£551

Sat 7/1119:10 -

1 stop14h 50m

Sat 14/1106:40 -

2 stops16h 05m

Deal found 7/10£552

Mon 26/1020:10 -

1 stop14h 50m

Fri 30/1019:30 -

1 stop27h 15m

Deal found 7/10£553

Tue 10/1119:10 -

2 stops32h 25m

Tue 17/1107:05 -

2 stops15h 40m

Deal found 8/10£554

Sun 8/1117:35 -

1 stop12h 25m

Tue 17/1109:00 -

2 stops20h 13m

Deal found 8/10£734

Best flights from Illinois to Heathrow
Discover carefully curated flight deals from Illinois to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 October 2026.

Fri 26/310:30 -

2 stops17h 50m

Mon 5/419:50 -

2 stops26h 20m

Deal found 10/10£552

Tue 6/421:30 -

Nonstop8h 25m

Wed 21/406:50 -

1 stop11h 10m

Deal found 11/10£653

Sun 14/318:45 -

Nonstop8h 10m

Fri 26/306:00 -

1 stop14h 00m

Deal found 7/10£660

Sun 7/318:50 -

2 stops15h 50m

Fri 12/307:00 -

2 stops15h 15m

Deal found 11/10£749

Mon 22/320:10 -

2 stops15h 15m

Tue 30/319:30 -

1 stop26h 40m

Deal found 9/10£615

Wed 2/1215:45 -

Nonstop8h 10m

Mon 14/1220:15 -

1 stop28h 10m

Deal found 9/10£685

Tue 24/1117:45 -

Nonstop8h 10m

Wed 9/1207:40 -

Nonstop9h 05m

Deal found 8/10£700

Tue 24/1119:10 -

1 stop14h 50m

Fri 18/1210:20 -

1 stop12h 25m

Deal found 8/10£650

Sun 8/1117:45 -

Nonstop8h 10m

Sun 15/1109:00 -

1 stop13h 15m

Deal found 9/10£714

Sun 13/1219:10 -

1 stop14h 50m

Fri 1/110:20 -

1 stop12h 25m

Deal found 7/10£670

Sat 7/1121:50 -

Nonstop8h 10m

Sat 14/1106:00 -

1 stop12h 40m

Deal found 9/10£752

Sun 8/1117:35 -

1 stop12h 25m

Tue 17/1109:00 -

2 stops20h 13m

Deal found 8/10£734

Sun 8/1117:37 -

1 stop11h 58m

Tue 17/1115:40 -

1 stop14h 23m

Deal found 8/10£756

Sun 14/210:56 -

1 stop12h 59m

Sun 28/213:45 -

2 stops35h 15m

Deal found 7/10£735

Sun 21/316:00 -

1 stop15h 15m

Sat 27/314:45 -

1 stop24h 49m

Deal found 8/10£827

Tue 24/1106:25 -

1 stop17h 30m

Tue 1/1209:00 -

2 stops18h 00m

Deal found 10/10£783

Mon 23/1106:25 -

2 stops18h 05m

Mon 30/1113:45 -

2 stops37h 15m

Deal found 9/10£783

Fri 20/1108:45 -

1 stop15h 45m

Fri 27/1107:40 -

Nonstop9h 05m

Deal found 11/10£784

Find flight deals from Illinois to Heathrow

Round-trip from	£545
One-way from	£245
Popular in	June
Cheapest in	February
Average price	£659
Good round-trip deal	£723 or less
Good one-way deal	£281 or less

Scandinavian Airlines
13/11-19/11
2 total stops
30h 55m total
Illinois to London

Search Deals

Aer Lingus
4/4-31/12
1 total stop
10h 20m total
Illinois to London

Search Deals

Highest demand for flights based on searches. 21% potential increase in price (£135 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease (£27 potential savings vs. average return price).

Search Deals

Average for round-trip flights in October 2026

Search Deals

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.

Search Deals

Cheapflights Fare Finder

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 return flight

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Sat 3/4

18:10-20:00

1 stop19h 50m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£249

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Sun 28/2

08:00-06:20

2 stops16h 20m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£249

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Sat 13/3

18:40-06:30

1 stop29h 50m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£252

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Mon 4/1

18:30-19:30

1 stop19h 00m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£260

PeoriaLondon

PIA Greater Peoria - LHR London Heathrow

PIALHR

Greater Peoria

Mon 22/3

18:16-11:35

1 stop12h 19m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£267

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Sat 7/11

13:00-06:55

1 stop11h 55m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£320

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Sat 17/10

09:38-15:35

2 stops23h 57m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£401

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Sat 24/10

12:38-19:55

2 stops25h 17m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£401

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Wed 2/12

07:00-06:50

2 stops17h 50m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£422

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Tue 27/10

13:00-17:30

3 stops23h 30m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£425

Flights are sorted by cheapest return flights first.

Deals found on 7/10

Showing 1-10 of 33 resultsSorted by cheapest first

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.

ORD-LHR

PIA-LHR

Estimated return 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

USIL-LHR

ORD-LHR

PIA-LHR

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 £473). Flying from Illinois to London Heathrow Airport in June is currently the most expensive (average of £1,045). 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?

When flying from Illinois to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Illinois to London Heathrow Airport

The most flights from USIL to LHR are scheduled on a Monday (56 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (38 on average).

How much does it cost for a return flight from Illinois to London Heathrow Airport?

Airfare is below average for this route at the moment.

Illinois to London Heathrow Airport flights typically cost between £551 and £724 in November.
The cheapest return price found within the last 5 days was £545 on Scandinavian Airlines (13 Nov–19 Nov).

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

The price you pay for your flight from Illinois to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 65 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Related info for your journey

How long is the flight from Illinois to London Heathrow Airport?
For as low as £653, Scandinavian Airlines can have you in London Heathrow Airport from Illinois in 8h 25m. The distance from Illinois to London Heathrow Airport is about 3939 mi. This flight may include one or multiple stops.
What are the cheapest airlines to fly from Illinois to London Heathrow Airport one-way?
The cheapest airline one-way is Lufthansa, with whom users have recently found tickets for as low as £285. However, be on the lookout for offers from Iberia and British Airways, as they are both options that can get you from Illinois to London Heathrow Airport for a low price.
What are the most popular routes from Illinois to London Heathrow Airport?
The most popular route from Illinois to London Heathrow Airport is Chicago O'Hare Intl - London Heathrow. You may also consider Chicago Midway - London Heathrow or Lambert-St Louis - London Heathrow.
What are the most reliable airlines from Illinois to London Heathrow Airport?
No one likes to see their flight delayed. When booking a flight from Illinois to London Heathrow Airport consider choosing Royal Jordanian (80%), Aer Lingus (74%) or Malaysia Airlines (73%) as they are the most reliable in getting you off to your destination on time.
What are the cheapest flights from Illinois to London Heathrow Airport?
On average you can expect to pay £668 for a flight from Illinois to London Heathrow Airport. The cheapest flight overall is £275 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £268.
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 holiday 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 £473). Flying from Illinois to London Heathrow Airport in June is currently the most expensive (average of £1,045). 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.

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Top 7 airlines flying from Illinois to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£370	Average£570	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
British Airways	Cheapest£460	Average£738	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Aer Lingus	Cheapest£466	Average£818	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
American Airlines	Cheapest£496	Average£865	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
United Airlines	Cheapest£515	Average£926	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Iberia	Cheapest£526	Average£706	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
JetBlue	Cheapest£751	Average£895	FlexibilityNo cancel fee	On-time62%	Search JetBlue flights

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How does Cheapflights help users find flights from Illinois to Heathrow?

When you search for this flight from Illinois to Heathrow, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Illinois to Heathrow?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Heathrow from Illinois.

Can Cheapflights find flights from Illinois to Heathrow with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Illinois to Heathrow, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Illinois to Heathrow become cheaper?

Yes, Cheapflights offers price alerts on Illinois to Heathrow flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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Cheap flights from Illinois to London Heathrow Airport from £245

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/4. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Illinois to Heathrow

Cheapest flights from Illinois to HeathrowExplore 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 12 October 2026.

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 12 October 2026.

Best flights from Illinois to HeathrowDiscover carefully curated flight deals from Illinois to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 October 2026.

Discover carefully curated flight deals from Illinois to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 October 2026.

Direct flights from Illinois to HeathrowExplore direct flight options from Illinois to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 12 October 2026.

Explore direct flight options from Illinois to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 12 October 2026.

Last-minute flights from Illinois to HeathrowDiscover last-minute flight deals from Illinois to Heathrow. Data last updated 12 October 2026 and is based on user searches.

Discover last-minute flight deals from Illinois to Heathrow. Data last updated 12 October 2026 and is based on user searches.

One-way flights from Illinois to HeathrowSearch for one-way flight options from Illinois to Heathrow. Find affordable one-way fares based on user searches. Data last updated 12 October 2026.

Search for one-way flight options from Illinois to Heathrow. Find affordable one-way fares based on user searches. Data last updated 12 October 2026.

Find flight deals from Illinois to Heathrow

Round-trip from

One-way from

Popular in

Cheapest in

Average price

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Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to London Heathrow Airport that are best for you.

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.

Cheapflights Insights

What is the cheapest month to book a flight from Illinois to London Heathrow Airport?

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 12 October 2026.

When flying from Illinois to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 12 October 2026.

The most flights from USIL to LHR are scheduled on a Monday (56 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (38 on average).

How much does it cost for a return flight from Illinois to London Heathrow Airport?

Airfare is below average for this route at the moment.

Illinois to London Heathrow Airport flights typically cost between £551 and £724 in November.The cheapest return price found within the last 5 days was £545 on Scandinavian Airlines (13 Nov–19 Nov).

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

The price you pay for your flight from Illinois to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 65 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Related info for your journey

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

What are the cheapest airlines to fly from Illinois to London Heathrow Airport one-way?

What are the most popular routes from Illinois to London Heathrow Airport?

What are the most reliable airlines from Illinois to London Heathrow Airport?

What are the cheapest flights from Illinois to London Heathrow Airport?

Can I find deals for flights from Illinois to Heathrow that include hotel bookings?

How can I find direct flights from Illinois to Heathrow?

Can I find deals for business class flights from Illinois to Heathrow?

What is the cheapest month to book a flight from Illinois to London Heathrow Airport?

Travelling to a place near London Heathrow Airport?

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Search flights from Illinois to Heathrow by cabin class

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Other flights to Heathrow

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Top 7 airlines flying from Illinois to Heathrow

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Can Cheapflights notify me if prices for flights from Illinois to Heathrow become cheaper?

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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 12 October 2026.

Best flights from Illinois to Heathrow
Discover carefully curated flight deals from Illinois to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 October 2026.

Direct flights from Illinois to Heathrow
Explore direct flight options from Illinois to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 12 October 2026.

Last-minute flights from Illinois to Heathrow
Discover last-minute flight deals from Illinois to Heathrow. Data last updated 12 October 2026 and is based on user searches.

One-way flights from Illinois to Heathrow
Search for one-way flight options from Illinois to Heathrow. Find affordable one-way fares based on user searches. Data last updated 12 October 2026.

Illinois to London Heathrow Airport flights typically cost between £551 and £724 in November.
The cheapest return price found within the last 5 days was £545 on Scandinavian Airlines (13 Nov–19 Nov).