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Flights from Siem Reap to Koh Samui

Airlines operating flights from Siem Reap to Koh Samui

Choose from 1 airlines flying from Siem Reap to Koh Samui, including Bangkok Airways, and . Thai AirAsia currently offers the cheapest ticket on this route.
Bangkok Airways logo Bangkok Airways

Find the cheapest flight options from Siem Reap to Koh Samui over the next three months. Book one-way tickets from €151 and round-trip tickets from €368.

      • SAI 16:50
        14h 20m
        1 stop
        USM 07:10
        Siem Reap - Koh Samui | Thu, Jan 15 | Thai AirAsia
        USM 20:30
        12h 45m
        1 stop
        SAI 09:15
        Koh Samui - Siem Reap | Thu, Jan 22 | Bangkok Airways
        €368 €438
        16% OFF
        16% OFF
        €438 €368
      • SAI 09:50
        8h
        1 stop
        USM 17:50
        Siem Reap - Koh Samui | Sun, Jan 11 | Thai Airways
        USM 21:10
        11h 35m
        1 stop
        SAI 08:45
        Koh Samui - Siem Reap | Sun, Jan 18 | Thai Airways
        €376 €438
        14% OFF
        14% OFF
        €438 €376
      • SAI 09:50
        10h 35m
        1 stop
        USM 20:25
        Siem Reap - Koh Samui | Sat, Jan 10 | Thai Airways
        USM 21:10
        11h 35m
        1 stop
        SAI 08:45
        Koh Samui - Siem Reap | Sat, Jan 17 | Thai Airways
        €379 €438
        13% OFF
        13% OFF
        €438 €379
      • SAI 20:45
        11h 55m
        1 stop
        USM 08:40
        Siem Reap - Koh Samui | Thu, Dec 11 | Thai AirAsia
        USM 08:30
        4h 10m
        1 stop
        SAI 12:40
        Koh Samui - Siem Reap | Wed, Dec 17 | Bangkok Airways
        €380
        13% OFF
        €438 €380
      • SAI 09:50
        10h 35m
        1 stop
        USM 20:25
        Siem Reap - Koh Samui | Thu, Jan 15 | Thai Airways
        USM 20:30
        12h 15m
        1 stop
        SAI 08:45
        Koh Samui - Siem Reap | Thu, Jan 22 | Thai Airways
        €384
        12% OFF
        €438 €384
      • SAI 09:55
        9h 55m
        1 stop
        USM 19:50
        Siem Reap - Koh Samui | Thu, Jan 22 | Bangkok Airways
        USM 09:20
        6h 45m
        1 stop
        SAI 16:05
        Koh Samui - Siem Reap | Thu, Jan 29 | Bangkok Airways
        €384
        12% OFF
        €438 €384
      • SAI 20:45
        10h 25m
        1 stop
        USM 07:10
        Siem Reap - Koh Samui | Sat, Jan 10 | Thai AirAsia
        USM 07:15
        5h 25m
        1 stop
        SAI 12:40
        Koh Samui - Siem Reap | Sat, Jan 17 | Bangkok Airways
        €387
        11% OFF
        €438 €387
      • SAI 20:45
        10h 25m
        1 stop
        USM 07:10
        Siem Reap - Koh Samui | Tue, Jan 13 | Thai AirAsia
        USM 10:00
        10h
        1 stop
        SAI 20:00
        Koh Samui - Siem Reap | Fri, Jan 16 | Bangkok Airways
        €391
        11% OFF
        €438 €391
      • SAI 19:25
        11h 45m
        1 stop
        USM 07:10
        Siem Reap - Koh Samui | Mon, Jan 12 | Bangkok Airways
        USM 09:20
        6h 45m
        1 stop
        SAI 16:05
        Koh Samui - Siem Reap | Mon, Jan 19 | Bangkok Airways
        €392
        10% OFF
        €438 €392
      • SAI 09:50
        11h 30m
        1 stop
        USM 21:20
        Siem Reap - Koh Samui | Thu, Dec 11 | Thai Airways
        USM 21:10
        12h 5m
        1 stop
        SAI 09:15
        Koh Samui - Siem Reap | Wed, Dec 17 | Bangkok Airways
        €394
        10% OFF
        €438 €394
      • REP 13:00
        17h 25m
        1 stop
        USM Invalid Date
        Siem Reap - Koh Samui | Sat, Dec 13 | Normal Airline
        USM 15:00
        6h
        Direct
        REP 16:00
        Koh Samui - Siem Reap | Mon, Dec 15 | Normal Airline
        Find More Flights
        Find More Flights
      • SAI 20:45
        10h 25m
        1 stop
        USM 07:10
        Siem Reap - Koh Samui | Tue, Dec 16 | Thai AirAsia
        €151 €389
        61% OFF
        61% OFF
        €389 €151
      • SAI 20:45
        10h 25m
        1 stop
        USM 07:10
        Siem Reap - Koh Samui | Thu, Jan 29 | Thai AirAsia
        €158 €389
        59% OFF
        59% OFF
        €389 €158
      • SAI 20:45
        10h 25m
        1 stop
        USM 07:10
        Siem Reap - Koh Samui | Sat, Jan 10 | Thai AirAsia
        €158 €389
        59% OFF
        59% OFF
        €389 €158
      • SAI 20:45
        10h 25m
        1 stop
        USM 07:10
        Siem Reap - Koh Samui | Wed, Jan 28 | Thai AirAsia
        €158
        59% OFF
        €389 €158
      • SAI 20:45
        10h 25m
        1 stop
        USM 07:10
        Siem Reap - Koh Samui | Tue, Jan 13 | Thai AirAsia
        €159
        59% OFF
        €389 €159
      • SAI 20:45
        10h 25m
        1 stop
        USM 07:10
        Siem Reap - Koh Samui | Wed, Jan 21 | Thai AirAsia
        €160
        59% OFF
        €389 €160
      • SAI 20:45
        10h 25m
        1 stop
        USM 07:10
        Siem Reap - Koh Samui | Sat, Jan 24 | Thai AirAsia
        €160
        59% OFF
        €389 €160
      • SAI 20:45
        11h 20m
        1 stop
        USM 08:05
        Siem Reap - Koh Samui | Sun, Jan 25 | Thai AirAsia
        €160
        59% OFF
        €389 €160
      • SAI 16:50
        14h 20m
        1 stop
        USM 07:10
        Siem Reap - Koh Samui | Sun, Jan 11 | Thai AirAsia
        €160
        59% OFF
        €389 €160
      • SAI 20:45
        10h 25m
        1 stop
        USM 07:10
        Siem Reap - Koh Samui | Sat, Dec 13 | Thai AirAsia
        €350
        10% OFF
        €389 €350
      • REP 13:00
        17h 25m
        1 stop
        USM Invalid Date
        Siem Reap - Koh Samui | Sat, Dec 13 | Normal Airline
        Find More Flights
        Find More Flights

Displayed flight fares from Siem Reap to Koh Samui are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Flight details for Siem Reap to Koh Samui

The distance between Siem Reap and Koh Samui is 592.61 km. Based on Trip.com's data, travel demand peaks in July. The off-season for travel is October.

Cheapest one-way flight price€151
Cheapest round-trip ticket price€368
Off-season for travelOctober
Peak season for travelJuly
Flight distance592.61 km
Popular airlineBangkok Airways

Find the best time to fly from Siem Reap to Koh Samui

The cheapest time for Siem Reap to Koh Samui flights: Dec 14 to Dec 21 — one way flight prices from €151.

Cheapest flights
From price
Search
  • 714
  • 1421
  • 2128

  • Jan

    284
  • 411
  • 1118
  • 1825

  • Feb

    251
  • 18
  • 815
  • 1522

  • Mar

    221
Displayed fare trends are based on Trip.com's aggregated average of the lowest flight prices from Siem Reap to Koh Samui, calculated over the upcoming 10 weeks.

Flight FAQs

  • What are the cheapest flights from Siem Reap to Koh Samui (REP-USM)?

    Based on Trip.com data, Thai AirAsia offers one-way fares as low as €151 on Cheapest nonstop routes (e.g. SAI to USM on Tue, Dec 16), while Thai AirAsia offers Cheapest nonstop round-trips from €368 departing on Thu, Jan 15 and returning on Thu, Jan 22.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Siem Reap to Koh Samui is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • To find best deals on flights from Siem Reap to Koh Samui, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Tue, Dec 16, with one-way flights priced at just €151.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Thai AirAsia.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Koh Samui travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Siem Reap to Koh Samui is October, when demand for travel is lower.
  • After crunching the numbers on our December flight calendar, it's currently cheapest to fly from Siem Reap to Koh Samui on December 12, 2025 with Thai AirAsia, with prices starting at €149.
  • The time difference between Koh Samui and Siem Reap is 0h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.