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Flights from Koh Samui to Colombo

Find flight deals from Koh Samui to Colombo for the next 3 months. Book one way flights from £185 or round trip flights from £394.

      • USM 06:45
        20h 30m
        1 stop
        CMB 01:45
        Koh Samui - Colombo | Thu, Jan 22 | Bangkok Airways
        CMB 03:15
        26h 50m
        1 stop
        USM 07:35
        Colombo - Koh Samui | Sun, Jan 25 | Thai AirAsia
        £394 £503
        22% OFF
        22% OFF
        £503 £394
      • USM 06:45
        20h 30m
        1 stop
        CMB 01:45
        Koh Samui - Colombo | Sat, Feb 7 | Bangkok Airways
        CMB 23:00
        20h 50m
        1 stop
        USM 21:20
        Colombo - Koh Samui | Mon, Feb 9 | Thai AirAsia
        £405 £503
        20% OFF
        20% OFF
        £503 £405
      • USM 07:00
        16h 30m
        1 stop
        CMB 22:00
        Koh Samui - Colombo | Fri, Dec 19 | Bangkok Airways
        CMB 23:00
        16h 10m
        1 stop
        USM 16:40
        Colombo - Koh Samui | Fri, Dec 26 | Thai AirAsia
        £408 £503
        19% OFF
        19% OFF
        £503 £408
      • USM 07:15
        16h 15m
        1 stop
        CMB 22:00
        Koh Samui - Colombo | Mon, Feb 2 | Bangkok Airways
        CMB 23:10
        20h 40m
        1 stop
        USM 21:20
        Colombo - Koh Samui | Sun, Feb 8 | Thai AirAsia
        £426
        15% OFF
        £503 £426
      • USM 07:00
        20h 15m
        1 stop
        CMB 01:45
        Koh Samui - Colombo | Tue, Dec 16 | Bangkok Airways
        CMB 23:00
        15h 10m
        1 stop
        USM 15:40
        Colombo - Koh Samui | Tue, Dec 23 | Thai AirAsia
        £429
        15% OFF
        £503 £429
      • USM 11:00
        12h 30m
        1 stop
        CMB 22:00
        Koh Samui - Colombo | Fri, Jan 9 | Bangkok Airways
        CMB 23:10
        14h 5m
        1 stop
        USM 14:45
        Colombo - Koh Samui | Sat, Jan 17 | Thai AirAsia
        £441
        12% OFF
        £503 £441
      • USM 07:15
        16h 15m
        1 stop
        CMB 22:00
        Koh Samui - Colombo | Fri, Jan 2 | Bangkok Airways
        CMB 02:50
        26h 50m
        1 stop
        USM 07:10
        Colombo - Koh Samui | Wed, Jan 7 | Thai AirAsia
        £443
        12% OFF
        £503 £443
      • USM 06:45
        16h 45m
        1 stop
        CMB 22:00
        Koh Samui - Colombo | Fri, Dec 12 | Bangkok Airways
        CMB 03:15
        16h 35m
        1 stop
        USM 21:20
        Colombo - Koh Samui | Sun, Dec 14 | Thai AirAsia
        £443
        12% OFF
        £503 £443
      • USM 16:35
        10h 40m
        1 stop
        CMB 01:45
        Koh Samui - Colombo | Thu, Jan 1 | Bangkok Airways
        CMB 23:10
        19h 45m
        1 stop
        USM 20:25
        Colombo - Koh Samui | Thu, Jan 8 | Thai AirAsia
        £447
        11% OFF
        £503 £447
      • USM 07:15
        20h
        1 stop
        CMB 01:45
        Koh Samui - Colombo | Thu, Dec 18 | Bangkok Airways
        CMB 23:10
        10h 55m
        1 stop
        USM 11:35
        Colombo - Koh Samui | Thu, Dec 25 | Thai AirAsia
        £447
        11% OFF
        £503 £447
      • USM 13:00
        17h 25m
        1 stop
        CMB Invalid Date
        Koh Samui - Colombo | Fri, Dec 12 | Normal Airline
        CMB 15:00
        6h
        Nonstop
        USM 16:00
        Colombo - Koh Samui | Sun, Dec 14 | Normal Airline
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Displayed flight fares from Koh Samui to Colombo are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Flight Info | Koh Samui to Colombo

The distance between Koh Samui and Colombo is approximately 2,242.83 km. Based on Trip.com's data travel demand peaks in July. The off-season for travel is October.

Cheapest one-way flight price£185
Cheapest return ticket price£394
Off-season for travelOctober
Peak season for travelJuly
Flight distance2,242.83 km

When is the cheapest time to fly from Koh Samui to Colombo?

The cheapest time for Koh Samui to Colombo flights: Jan 4 to Jan 11 — one way flight prices from £163.

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 Koh Samui to Colombo, calculated over the upcoming 10 weeks.

Frequently Asked Questions

  • What are the cheapest flights from Koh Samui to Colombo (USM-CMB)?

    Based on Trip.com data, Bangkok Airways offers one-way fares as low as £185 on Cheapest nonstop routes (e.g. USM to CMB on Tue, Dec 16), while Bangkok Airways offers Cheapest nonstop round-trips from £394 departing on Thu, Jan 22 and returning on Sun, Jan 25.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Koh Samui to Colombo 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 Koh Samui to Colombo, 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 £185.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Bangkok Airways.
    · 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 Colombo travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Koh Samui to Colombo is October, when demand for travel is lower.
  • After crunching the numbers on our December flight calendar, it's currently cheapest to fly from Koh Samui to Colombo on December 19, 2025 with Bangkok Airways, with prices starting at £407.
  • The time difference between Colombo and Koh Samui is 1h.
  • 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.

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