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.

฿6,806+ 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.

One-way

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 10 September 2026.

Thu 19/1111:00 -

1 stop24h 00m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 8/9฿6,806

Thu 17/917:00 -

2 stops18h 10m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 8/9฿7,398

Mon 8/209:20 -

1 stop6h 45m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 7/9฿7,924

Tue 29/917:00 -

2 stops18h 10m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 8/9฿8,220

Mon 28/917:00 -

2 stops18h 10m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 7/9฿8,253

Tue 26/106:45 -

1 stop13h 15m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 6/9฿8,286

Sun 27/917:00 -

2 stops18h 10m

Wed 31/1200:00 -

Nonstop0h 00m

Deal found 7/9฿8,417

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Thu 19/11

07:00-08:45

1 stop25h 45m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿7,135

Fastest return journey

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Mon 8/2

09:20-16:05

1 stop6h 45m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿7,924

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Tue 29/9

17:00-11:10

2 stops18h 10m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿8,220

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Mon 28/9

17:00-11:10

2 stops18h 10m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿8,253

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Tue 26/1

06:45-20:00

1 stop13h 15m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿8,286

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Sun 27/9

17:00-11:10

2 stops18h 10m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿8,417

Ko SamuiSiem Reap

USM Ko Samui - SAI Siem Reap–Angkor Intl

USMSAI

Ko Samui

Mon 28/9

19:45-09:00

1 stop13h 15m

Siem Reap–Angkor Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

฿9,239

Flights are sorted by cheapest return flights first.

Deals found on 6/9

Sorted 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

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.

Browse thousands of different options on Cheapflights for your next trip

Alternative routes

Complete your trip

Direct flights to Cambodia

Flights by cabin class

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Alternative routes for Ko Samui to Siem Reap

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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?

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 Siem Reap from Ko Samui.

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Ko Samui to Siem Reap flexibly with Cheapflights today.

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

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This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 19/11. 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

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 10 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 10 September 2026.

Cheapflights Fare Finder

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

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

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.

Search flights from Ko Samui to Siem Reap by cabin class

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

Ko Samui and Siem Reap flights

Browse other Ko Samui and Siem Reap flight options. Last updated on 10 September 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Fly with Cheapflights

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

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

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

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

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Book With Flexibility

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Cheap flights from Ko Samui to Siem Reap, Cambodia from ฿6,806

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 19/11. 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

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 10 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 10 September 2026.

Cheapflights Fare Finder

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

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

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.

Search flights from Ko Samui to Siem Reap by cabin class

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

Ko Samui and Siem Reap flights

Browse other Ko Samui and Siem Reap flight options. Last updated on 10 September 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Fly with Cheapflights

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

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

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

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

100% Free

Book With Flexibility

Travel Smart

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 10 September 2026.