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

A quick flight from Ko Samui to Siem Reap can take about 6h 40m. Emirates provides one of the quickest options available for as low as $647. The distance from Ko Samui to Siem Reap is about 386 mi.

In terms of precipitation, rainfall in Siem Reap ranges from 0.0 - 10.2 inches per month. September is typically the wettest month, when rainfall can reach 10.2 in. January is typically the driest time to visit Siem Reap when rainfall is around 0.0 in.

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 84.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 75.2 F).

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.

Most accurate provider : When it comes to deals on Ko Samui-Siem Reap flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ko Samui-Siem Reap flight deals on Cheapflights vs. eDreams 90-95% of the time. Price accuracy is based on data collected from Ko Samui-Siem Reap flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Ko Samui-Siem Reap flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ko Samui-Siem Reap flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 vacation 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.

$182+ Cheap Flights from Ko Samui to Siem Reap, Cambodia

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Cheap flight deals from Ko Samui to Siem Reap

Cheapest

Best

One-way

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 October 30, 2026.

Sat 12/262:30 pm -

1 stop6h 40m

Wed 12/301:20 pm -

1 stop22h 30m

Deal found 10/27

$647

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 October 30, 2026.

Mon 11/237:00 am -

1 stop5h 40m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/28

$182

Tue 11/246:15 pm -

1 stop21h 50m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/28

$189

Mon 11/2311:10 am -

2 stops23h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/28

$217

Mon 11/239:10 pm -

1 stop11h 35m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/28

$274

Thu 4/111:45 am -

1 stop7h 00m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/29

$276

Mon 3/299:15 am -

1 stop9h 30m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/29

$288

Sat 1/26:30 pm -

1 stop14h 15m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/25

$294

Sat 1/23:35 pm -

2 stops28h 55m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/25

$436

Fri 4/27:10 pm -

1 stop26h 20m

Wed 12/3112:00 am -

Nonstop0h 00m

Deal found 10/29

$1,083

Find flight deals from Ko Samui to Siem Reap

Most accurate provider	eDreams 2 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$647 (Emirates)
One-way from	$182 (Booking.com)

Provider with most accurate pricing for Ko Samui-Siem Reap–Angkor Intl flight deals.

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Provider most trusted by Cheapflights users for Ko Samui-Siem Reap–Angkor Intl flights.

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From Ko Samui to Siem Reap–Angkor Intl

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One-way flight from Ko Samui to Siem Reap–Angkor Intl

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Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Tue 11/24

6:15 pm-4:05 pm

1 stop21h 50m

Siem Reap–Angkor Intl

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$189

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Mon 11/23

9:10 pm-8:45 am

1 stop11h 35m

Siem Reap–Angkor Intl

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$274

Quickest round-trip

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Mon 3/29

9:15 am-6:45 pm

1 stop9h 30m

Siem Reap–Angkor Intl

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$288

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Sat 1/2

3:35 pm-8:30 pm

2 stops28h 55m

Siem Reap–Angkor Intl

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$436

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Mon 11/23

4:30 pm-11:50 am

3 stops19h 20m

Siem Reap–Angkor Intl

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$589

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Sat 12/26

2:30 pm-9:10 pm

1 stop6h 40m

Siem Reap–Angkor Intl

Wed 12/30

1:20 pm-11:50 am

1 stop22h 30m

$647

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Fri 4/2

7:10 pm-9:30 pm

1 stop26h 20m

Siem Reap–Angkor Intl

Wed 12/31

12:00 am-12:00 am

Nonstop0h 00m

$1,083

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Sorted by cheapest first

Most accurate provider: When it comes to deals on Ko Samui-Siem Reap flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ko Samui-Siem Reap flight deals on Cheapflights vs. eDreams 90-95% of the time. Price accuracy is based on data collected from Ko Samui-Siem Reap flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Ko Samui-Siem Reap flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ko Samui-Siem Reap flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 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.

Related info for your journey

How long is the flight from Ko Samui to Siem Reap?
A quick flight from Ko Samui to Siem Reap can take about 6h 40m. Emirates provides one of the quickest options available for as low as $647. The distance from Ko Samui to Siem Reap is about 386 mi.
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 vacation 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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$182+ Cheap flights from Ko Samui (USM) to Siem Reap, Cambodia (SAI)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/23. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ko Samui to Siem Reap with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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 October 30, 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 October 30, 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 layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.

Discover carefully curated flight deals from Ko Samui to Siem Reap that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.

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 October 30, 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 October 30, 2026.

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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.

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

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Alternative routes for Ko Samui to Siem Reap

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Complete your trip

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

Search flights from Ko Samui to Siem Reap by cabin class

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Ko Samui and Siem Reap flights

Browse other Ko Samui and Siem Reap flight options. Last updated on October 30, 2026.

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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 October 30, 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 layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.

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 October 30, 2026.