How long is the flight from Ko Samui to Siem Reap?

Airlines like Bangkok Airways and Thai Airways fly from Ko Samui to Siem Reap in about 8h 50m. The time it takes to get you to your destination can typically vary by up to 16h 55m. Airlines will cover a distance of 621 km. Both multi-stop and direct flights can be found to your destination and back.

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 is the cheapest time of day to fly from USM to SAI?

When flying from Ko Samui 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.

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

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

How can I find direct flights from Ko Samui to Siem Reap?

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

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

Yes. Cheapflights offers flight deals from Ko Samui 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.

฿5,689+ Cheap Flights from Ko Samui to Siem Reap, Cambodia

Cheap flight deals from Ko Samui to Siem Reap

Enter your travel dates to find the best prices.

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Cheapest flights from Ko Samui to Siem Reap
Explore the most affordable flight options available from Ko Samui to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2026.

Mon 26/1009:40 -

1 stop8h 50m

Mon 2/1109:55 -

1 stop5h 45m

Deal found 11/9฿13,506

Mon 26/1008:15 -

2 stops7h 45m

Mon 2/1111:45 -

1 stop8h 45m

Deal found 11/9฿14,870

Sun 13/1207:00 -

1 stop25h 45m

Sat 19/1209:50 -

1 stop24h 45m

Deal found 13/9฿15,935

Sun 13/1212:30 -

1 stop3h 35m

Sat 19/1210:00 -

2 stops9h 10m

Deal found 13/9฿20,991

Mon 21/920:35 -

1 stop12h 25m

Sun 27/909:40 -

1 stop8h 05m

Deal found 15/9฿23,187

Find flight deals from Ko Samui to Siem Reap

Round-trip from	฿13,506
One-way from	฿5,689

Bangkok Airways
26/10-2/11
2 total stops
14h 35m total
Ko Samui to Siem Reap

Search Deals

16/11-31/12
1 total stop
7h 50m total
Ko Samui to Siem Reap

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ko Samui to Siem Reap that are best for you.

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Fly to

Route

Depart

Return

Price

Cheapest return flight

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Mon 16/11

08:15-16:05

1 stop7h 50m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿5,689

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Fri 13/11

18:40-09:15

1 stop14h 35m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿6,321

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Sun 1/11

18:15-16:05

1 stop21h 50m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿6,620

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Sat 14/11

21:30-09:15

1 stop11h 45m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿6,886

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Thu 12/11

06:45-16:00

1 stop9h 15m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿7,452

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Wed 23/9

08:00-16:10

2 stops8h 10m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿8,051

Fastest return journey

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Wed 11/11

08:15-16:00

2 stops7h 45m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿8,317

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Fri 25/9

06:55-16:10

1 stop9h 15m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿8,516

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Thu 24/9

20:50-09:00

1 stop12h 10m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿8,949

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Tue 22/9

21:00-09:00

1 stop12h 00m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿8,982

Flights are sorted by cheapest return flights first.

Deals found on 10/9

Showing 1-10 of 15 resultsSorted by cheapest first

Best time to book a flight from Ko Samui to Siem Reap

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

USM-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.

Related info for your journey

How long is the flight from Ko Samui to Siem Reap?
Airlines like Bangkok Airways and Thai Airways fly from Ko Samui to Siem Reap in about 8h 50m. The time it takes to get you to your destination can typically vary by up to 16h 55m. Airlines will cover a distance of 621 km. Both multi-stop and direct flights can be found to your destination and back.
Can I find deals for flights from Ko Samui to Siem Reap that include hotel bookings?
Yes. In addition to deals on Ko Samui to Siem Reap flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Ko Samui to Siem Reap?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ko Samui to Siem Reap.
Can I find deals for business class flights from Ko Samui to Siem Reap?
Yes. Cheapflights offers flight deals from Ko Samui 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.

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Cheapflights makes it easy to find Ko Samui to Siem Reap flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

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Cheap flights from Ko Samui to Siem Reap, Cambodia from ฿5,689

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 16/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Ko Samui to Siem Reap

Cheapest flights from Ko Samui to Siem ReapExplore the most affordable flight options available from Ko Samui to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2026.

Explore the most affordable flight options available from Ko Samui to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2026.

Best flights from Ko Samui to Siem ReapDiscover carefully curated flight deals from Ko Samui to Siem Reap that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 September 2026.

Discover carefully curated flight deals from Ko Samui to Siem Reap that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 September 2026.

Last-minute flights from Ko Samui to Siem ReapDiscover last-minute flight deals from Ko Samui to Siem Reap. Data last updated 16 September 2026 and is based on user searches.

Discover last-minute flight deals from Ko Samui to Siem Reap. Data last updated 16 September 2026 and is based on user searches.

One-way flights from Ko Samui to Siem ReapSearch for one-way flight options from Ko Samui to Siem Reap. Find affordable one-way fares based on user searches. Data last updated 16 September 2026.

Search for one-way flight options from Ko Samui to Siem Reap. Find affordable one-way fares based on user searches. Data last updated 16 September 2026.

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Best time to book a flight from Ko Samui to Siem Reap

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Related info for your journey

How long is the flight from Ko Samui to Siem Reap?

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

How can I find direct flights from Ko Samui to Siem Reap?

Can I find deals for business class flights from Ko Samui 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 Ko Samui 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 rental and/or hotel reservation to your travel itinerary.

Direct flights to Cambodia

Book a non-stop flight to one of these other cities located in Cambodia.

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Ko Samui and Siem Reap flights

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Cheapest flights from Ko Samui to Siem Reap
Explore the most affordable flight options available from Ko Samui to Siem Reap. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2026.

Best flights from Ko Samui to Siem Reap
Discover carefully curated flight deals from Ko Samui to Siem Reap that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 September 2026.

Last-minute flights from Ko Samui to Siem Reap
Discover last-minute flight deals from Ko Samui to Siem Reap. Data last updated 16 September 2026 and is based on user searches.

One-way flights from Ko Samui to Siem Reap
Search for one-way flight options from Ko Samui to Siem Reap. Find affordable one-way fares based on user searches. Data last updated 16 September 2026.