What’s the top stopover airport for flights from London Heathrow Airport to Siem Reap?

Singapore (SIN) – chosen by Cheapflights users on 67% of one-stop itineraries from London Heathrow Airport to Siem Reap on Cheapflights.

What’s the cheapest stopover airport for flights from London Heathrow Airport to Siem Reap?

Singapore (SIN) is the most affordable one-stop option, with an average return flight price of £786.

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to Siem Reap?

Flights via Ho Chi Minh City (SGN) offer the fastest connection on this route, with an average stopover time of 1h 53m.

What’s the fastest stopover option from London Heathrow Airport to Siem Reap?

Flights via Bangkok (BKK) have the shortest average one-way travel time for one-stop routes: 13h 58m.

How long is the flight from London Heathrow Airport to Siem Reap?

A quick flight from London Heathrow Airport to Siem Reap can take about 28h 10m. SWISS provides one of the quickest options available for as low as £595. Airlines will cover a distance of 6106 mi. Both multi-stop and direct flights can be found to your destination and back.

What are the cheapest airlines flying from London Heathrow Airport to Siem Reap round-trip?

Cheapflights users have booked flights from London Heathrow Airport to Siem Reap round-trip from £543. Other airlines that can offer you cheap pricing are Lufthansa, from £602, and Vietnam Airlines, from £623. These flights start at 34% lower than the current average price 3 months from now.

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

The cheapet airlines for a one-way flight from London Heathrow Airport to Siem Reap are Vietnam Airlines (£455), Singapore Airlines (£519), and Thai Airways (£562).

In terms of precipitation, rainfall in Siem Reap ranges from 0.0 - 260.0 inches per month. September is typically the wettest month, when rainfall can reach 260.0 mm. January is typically the driest time to visit Siem Reap when rainfall is around 0.0 mm.

If weather is an important factor for your trip to Siem Reap, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 29.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 24.0 C).

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

Singapore Airlines, Vietnam Airlines and Thai Airways are the most popular airlines when flying from London Heathrow Airport to Siem Reap.

What is the cheapest time of day to fly from LHR to SAI?

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

What airport do you fly into for flights to Siem Reap from London Heathrow?

For a flight from London Heathrow to Siem Reap, you will be flying into Siem Reap–Angkor Intl. Siem Reap–Angkor Intl (SAI) is just 24.7 mi from the center of the city. Siem Reap–Angkor Intl is the only Siem Reap airport and it handles 0 inbound flights from London Heathrow per day. 5 airlines have flights to Siem Reap–Angkor Intl from London Heathrow on a regular basis.

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

Yes. In addition to deals on Heathrow to Siem Reap flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Heathrow to Siem Reap?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Siem Reap.

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

Yes. Cheapflights offers flight deals from Heathrow to Siem Reap by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£386+ Cheap Flights from London Heathrow Airport to Siem Reap, Cambodia

Q: How much does it cost for a return flight from London Heathrow Airport to Siem Reap?

Airfare is below average for this route at the moment. London Heathrow Airport to Siem Reap flights typically cost between £845 and £742 in June. The cheapest return flight price found within the last 3 days was £592 on Etihad Airways (26 Jun-3 Jul).

Cheap flight deals from Heathrow to Siem Reap

Enter your travel dates to find the best prices.

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One-way

Cheapest flights from Heathrow to Siem Reap
Explore the most affordable flight options available from Heathrow to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 June 2026.

Wed 10/621:45

LHR

SAI

2 stops31h 30m

Etihad Airways

Tue 16/619:20

SAI

LHR

2 stops29h 25m

Etihad Airways

Deal found 5/6£591

Fri 26/621:45

LHR

SAI

2 stops38h 05m

Etihad Airways

Fri 3/715:10

SAI

LHR

2 stops45h 50m

Etihad Airways

Deal found 4/6£592

Thu 3/908:45

LHR

SAI

2 stops28h 10m

SWISS

Thu 17/909:40

SAI

LHR

2 stops28h 15m

SWISS

Deal found 8/6£595

Tue 10/1109:00

LHR

SAI

2 stops26h 45m

SWISS

Tue 24/1109:55

SAI

LHR

2 stops18h 45m

SWISS

Deal found 7/6£610

Thu 17/912:20

LHR

SAI

2 stops24h 35m

Multiple Airlines

Thu 1/1009:40

SAI

LHR

2 stops18h 05m

Multiple Airlines

Deal found 6/6£611

Fri 13/1113:45

LHR

SAI

2 stops22h 00m

Multiple Airlines

Tue 1/1209:55

SAI

LHR

2 stops18h 45m

Multiple Airlines

Deal found 6/6£615

Mon 6/714:45

LHR

SAI

2 stops45h 05m

Etihad Airways

Tue 14/715:10

SAI

LHR

2 stops51h 35m

Etihad Airways

Deal found 8/6£615

Sat 31/1018:40

LHR

SAI

2 stops32h 10m

SWISS

Thu 26/1109:55

SAI

LHR

2 stops29h 10m

SWISS

Deal found 8/6£618

Tue 8/913:50

LHR

SAI

2 stops23h 05m

SWISS

Sat 26/909:40

SAI

LHR

2 stops18h 05m

SWISS

Deal found 4/6£618

Fri 13/1113:45

LHR

SAI

2 stops22h 00m

SWISS

Mon 30/1116:45

SAI

LHR

2 stops22h 20m

SWISS

Deal found 6/6£621

Sat 4/714:45

LHR

SAI

2 stops41h 35m

Etihad Airways

Sat 11/715:10

SAI

LHR

2 stops21h 50m

Etihad Airways

Deal found 4/6£622

Sat 31/1018:40

LHR

SAI

2 stops32h 10m

SWISS

Mon 30/1116:45

SAI

LHR

2 stops22h 20m

SWISS

Deal found 8/6£625

Find flight deals from Heathrow to Siem Reap

Round-trip from	£592
One-way from	£386
Popular in	August
Cheapest in	September
Average price	£824

Etihad Airways
26/6-3/7
4 total stops
83h 55m total
London to Siem Reap

Search Deals

Etihad Airways
6/7
2 total stops
38h 05m total
London to Siem Reap

Search Deals

Highest demand for flights based on searches. 4% potential increase in price (£28 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£14 potential savings vs. average return price).

Search Deals

Average for round-trip flights in June 2026

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Thu 3/9

08:45-18:55

2 stops28h 10m

Siem Reap–Angkor Intl

Thu 17/9

09:40-07:55

2 stops28h 15m

£595

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Sun 1/11

13:45-18:45

2 stops22h 00m

Siem Reap–Angkor Intl

Mon 30/11

16:45-08:05

2 stops22h 20m

£683

Fastest return journey

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Sat 14/11

19:25-18:45

2 stops16h 20m

Siem Reap–Angkor Intl

Mon 30/11

09:55-21:40

2 stops18h 45m

£691

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Sun 1/11

21:00-21:00

3 stops41h 00m

Siem Reap–Angkor Intl

Sat 28/11

22:00-17:30

3 stops50h 30m

£698

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 10/11

21:00-21:00

2 stops41h 00m

Siem Reap–Angkor Intl

Sat 5/12

22:00-17:30

2 stops50h 30m

£702

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Mon 6/7

20:45-11:15

2 stops32h 30m

Siem Reap–Angkor Intl

Wed 15/7

19:35-18:45

2 stops29h 10m

£769

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Sun 5/7

19:50-21:30

2 stops43h 40m

Siem Reap–Angkor Intl

Wed 15/7

12:55-14:25

2 stops31h 30m

£803

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Mon 10/8

14:25-21:30

2 stops25h 05m

Siem Reap–Angkor Intl

Thu 20/8

23:50-16:10

2 stops22h 20m

£878

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Wed 19/8

18:55-17:10

1 stop16h 15m

Siem Reap–Angkor Intl

Wed 16/9

22:35-16:55

1 stop24h 20m

£889

LondonSiem Reap

LHR - SAI

LHRSAI

London Heathrow

Tue 17/11

09:10-12:40

2 stops20h 30m

Siem Reap–Angkor Intl

Sun 13/12

13:20-11:40

2 stops29h 20m

£903

Flights are sorted by cheapest return flights first.

Deals found on 5/6

Showing 1-10 of 19 resultsSorted by cheapest first

Best time to book a flight from Heathrow to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from Heathrow with our price prediction graph.

LHR-SAI

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 London Heathrow Airport to Siem Reap

Prices

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

Currently, September is the cheapest month in which you can book a flight from London Heathrow Airport to Siem Reap (average of £720). Flying from London Heathrow Airport to Siem Reap in August is currently the most expensive (average of £1,032). 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.

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

Reviews of airlines servicing Siem Reap

Read reviews from past customers who have flown with Singapore Airlines,Thai Airways, andVietnam Airlines from London Heathrow Airport to Siem Reap. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Singapore Airlines

8.2

Very Good

1,539 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2026

SYD - SIN

creat a group of Senior (75 above) to allow them board the flight ahead of other groups.

Singapore Airlines

8.2

Very Good

1,539 reviews

Singapore Airlines

8.2

Very Good

1,539 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2026

SYD - SIN

creat a group of Senior (75 above) to allow them board the flight ahead of other groups.

Thai Airways

7.9

Good

406 reviews

Singapore Airlines

8.2

Very Good

1,539 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2026

SYD - SIN

creat a group of Senior (75 above) to allow them board the flight ahead of other groups.

Vietnam Airlines

7.7

Good

271 reviews

Singapore Airlines

8.2

Very Good

1,539 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2026

SYD - SIN

creat a group of Senior (75 above) to allow them board the flight ahead of other groups.

Austrian Airlines

7.6

Good

926 reviews

Singapore Airlines

8.2

Very Good

1,539 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2026

SYD - SIN

creat a group of Senior (75 above) to allow them board the flight ahead of other groups.

Lufthansa

6.8

Okay

8,050 reviews

Singapore Airlines

8.2

Very Good

1,539 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,May 2026

SYD - SIN

creat a group of Senior (75 above) to allow them board the flight ahead of other groups.

Related info for your journey

What airport do you fly into for flights to Siem Reap from London Heathrow?
For a flight from London Heathrow to Siem Reap, you will be flying into Siem Reap–Angkor Intl. Siem Reap–Angkor Intl (SAI) is just 24.7 mi from the center of the city. Siem Reap–Angkor Intl is the only Siem Reap airport and it handles 0 inbound flights from London Heathrow per day. 5 airlines have flights to Siem Reap–Angkor Intl from London Heathrow on a regular basis.
How long is the flight from London Heathrow Airport to Siem Reap?
A quick flight from London Heathrow Airport to Siem Reap can take about 28h 10m. SWISS provides one of the quickest options available for as low as £595. Airlines will cover a distance of 6106 mi. Both multi-stop and direct flights can be found to your destination and back.
What are the cheapest airlines flying from London Heathrow Airport to Siem Reap round-trip?
Cheapflights users have booked flights from London Heathrow Airport to Siem Reap round-trip from £543. Other airlines that can offer you cheap pricing are Lufthansa, from £602, and Vietnam Airlines, from £623. These flights start at 34% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from London Heathrow Airport to Siem Reap one-way?
The cheapet airlines for a one-way flight from London Heathrow Airport to Siem Reap are Vietnam Airlines (£455), Singapore Airlines (£519), and Thai Airways (£562).
Can I find deals for flights from Heathrow to Siem Reap that include hotel bookings?
Yes. In addition to deals on Heathrow to Siem Reap flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Heathrow to Siem Reap?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Siem Reap.
Can I find deals for business class flights from Heathrow to Siem Reap?
Yes. Cheapflights offers flight deals from Heathrow to Siem Reap 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 London Heathrow Airport to Siem Reap?
Currently, September is the cheapest month in which you can book a flight from London Heathrow Airport to Siem Reap (average of £720). Flying from London Heathrow Airport to Siem Reap in August is currently the most expensive (average of £1,032). 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

Browse thousands of different options on Cheapflights for your next trip

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Gatwick to Siem Reap flights

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London City to Siem Reap flights

Luton to Siem Reap flights

Top 5 airlines flying from Heathrow to Siem Reap

Airline	Cheapest	Average	Flexibility	On-time
Austrian Airlines	Cheapest£543	Average£690	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights
Lufthansa	Cheapest£602	Average£779	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Vietnam Airlines	Cheapest£621	Average£820	FlexibilityNo cancel fee	On-time81%	Search Vietnam Airlines flights
Singapore Airlines	Cheapest£669	Average£779	FlexibilityNo cancel fee	On-time81%	Search Singapore Airlines flights
Thai Airways	Cheapest£883	Average£963	FlexibilityNo cancel fee	On-time77%	Search Thai Airways flights

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When you search for this flight from Heathrow to Siem Reap, 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.

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It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Heathrow to Siem Reap.

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Cheap flights from London Heathrow Airport to Siem Reap, Cambodia from £386

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 6/7. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Heathrow to Siem Reap

Cheapest flights from Heathrow to Siem ReapExplore the most affordable flight options available from Heathrow to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 June 2026.

Explore the most affordable flight options available from Heathrow to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 June 2026.

Best flights from Heathrow to Siem ReapDiscover carefully curated flight deals from Heathrow to Siem Reap that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 9 June 2026.

Discover carefully curated flight deals from Heathrow to Siem Reap that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 9 June 2026.

Last-minute flights from Heathrow to Siem ReapDiscover last-minute flight deals from Heathrow to Siem Reap. Data last updated 9 June 2026 and is based on user searches.

Discover last-minute flight deals from Heathrow to Siem Reap. Data last updated 9 June 2026 and is based on user searches.

One-way flights from Heathrow to Siem ReapSearch for one-way flight options from Heathrow to Siem Reap. Find affordable one-way fares based on user searches. Data last updated 9 June 2026.

Search for one-way flight options from Heathrow to Siem Reap. Find affordable one-way fares based on user searches. Data last updated 9 June 2026.

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

Best time to book a flight from Heathrow to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from Heathrow with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Siem Reap

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

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

What’s the top stopover airport for flights from London Heathrow Airport to Siem Reap?

What’s the cheapest stopover airport for flights from London Heathrow Airport to Siem Reap?

What’s the fastest stopover option from London Heathrow Airport to Siem Reap?

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to Siem Reap?

Reviews of airlines servicing Siem Reap

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Siem Reap. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly into for flights to Siem Reap from London Heathrow?

How long is the flight from London Heathrow Airport to Siem Reap?

What are the cheapest airlines flying from London Heathrow Airport to Siem Reap round-trip?

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

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

How can I find direct flights from Heathrow to Siem Reap?

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Heathrow to Siem Reap

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Siem Reap by adding a car hire and/or hotel booking to your travel itinerary.

Search flights from Heathrow to Siem Reap by cabin class

Find flights from Heathrow to Siem Reap, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Heathrow and Siem Reap flights

Browse other Heathrow and Siem Reap flight options. Last updated on 9 June 2026.

Other flights from Heathrow

Browse through other flights departing from Heathrow. Flights are based on user searches made on Cheapflights and were last updated on 9 June 2026.

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Check out other popular destinations found by fellow travellers in 2026

Top 5 airlines flying from Heathrow to Siem Reap

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How does Cheapflights help users find flights from Heathrow to Siem Reap?

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

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

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

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Cheapest flights from Heathrow to Siem Reap
Explore the most affordable flight options available from Heathrow to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 June 2026.

Best flights from Heathrow to Siem Reap
Discover carefully curated flight deals from Heathrow to Siem Reap that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 9 June 2026.

Last-minute flights from Heathrow to Siem Reap
Discover last-minute flight deals from Heathrow to Siem Reap. Data last updated 9 June 2026 and is based on user searches.

One-way flights from Heathrow to Siem Reap
Search for one-way flight options from Heathrow to Siem Reap. Find affordable one-way fares based on user searches. Data last updated 9 June 2026.