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. Find deals

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). Find deals

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. Find deals

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. Find deals

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.

฿5,357+ Cheap Flights from Ko Samui to Siem Reap, Cambodia

Cheap flight deals from Ko Samui to Siem Reap

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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 15 February 2026.

Mon 2/308:15

USM

SAI

1 stop7h 50m

Multiple Airlines

Fri 6/320:45

SAI

USM

1 stop11h 05m

Multiple Airlines

Deal found 13/2฿15,080

Find flight deals from Ko Samui to Siem Reap

Round-trip from	฿15,080
One-way from	฿5,357

2/3-6/3
2 total stops
18h 55m total
Ko Samui to Siem Reap

Search Deals

Bangkok Airways
16/6
1 total stop
10h 55m total
Ko Samui to Siem Reap

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Fly from

Fly to

Route

Depart

Return

Price

Ko SamuiSiem Reap

USM - SAI

USMSAI

Ko Samui

Mon 2/3

08:15-16:05

1 stop7h 50m

Siem Reap–Angkor Intl

Fri 6/3

20:45-07:50

1 stop11h 05m

฿15,080

Ko SamuiSiem Reap

USM - SAI

USMSAI

Ko Samui

Tue 16/6

07:50-18:45

1 stop10h 55m

฿5,357

Ko SamuiSiem Reap

USM - SAI

USMSAI

Ko Samui

Sun 5/4

07:50-12:15

1 stop28h 25m

฿6,255

Ko SamuiSiem Reap

USM - SAI

USMSAI

Ko Samui

Mon 23/2

12:50-16:05

1 stop27h 15m

฿6,657

Ko SamuiSiem Reap

USM - SAI

USMSAI

Ko Samui

Thu 12/3

08:15-16:05

1 stop7h 50m

฿6,781

Ko SamuiSiem Reap

USM - SAI

USMSAI

Ko Samui

Sat 28/2

09:20-16:05

1 stop6h 45m

฿6,781

Ko SamuiSiem Reap

USM - SAI

USMSAI

Ko Samui

Mon 9/3

09:20-16:05

1 stop6h 45m

฿6,905

Ko SamuiSiem Reap

USM - SAI

USMSAI

Ko Samui

Sat 7/3

08:15-16:05

1 stop7h 50m

฿6,967

Ko SamuiSiem Reap

USM - SAI

USMSAI

Ko Samui

Tue 10/3

08:15-16:05

1 stop7h 50m

฿6,967

Ko SamuiSiem Reap

USM - SAI

USMSAI

Ko Samui

Wed 25/2

19:00-16:05

1 stop21h 05m

฿7,060

Flights are sorted by cheapest return flights first.

Deals found on 14/2

Showing 1-10 of 12 results

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

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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.

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Cheap flights from Ko Samui to Siem Reap, Cambodia from ฿5,357

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 16/6. 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 15 February 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 15 February 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 15 February 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 15 February 2026.

Last-minute flights from Ko Samui to Siem ReapDiscover last-minute flight deals from Ko Samui to Siem Reap. Data last updated 15 February 2026 and is based on user searches.

Discover last-minute flight deals from Ko Samui to Siem Reap. Data last updated 15 February 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 15 February 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 15 February 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

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

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

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Ko Samui and Siem Reap flights

Browse other Ko Samui and Siem Reap flight options. Last updated on 15 February 2026.

Other flights from Ko Samui

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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

Travel Smart

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 15 February 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 15 February 2026.

Last-minute flights from Ko Samui to Siem Reap
Discover last-minute flight deals from Ko Samui to Siem Reap. Data last updated 15 February 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 15 February 2026.