A beach with colorful kayaks lined up and a mountain range in the background.

Cheap Flights to Koh Madsum from HK$861

View HK$861 flight on Tue, 1 Sept 2026Opens in a new window

Popular airlines

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 35% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap round-trip flights to Koh Madsum

Prices were available within the past 7 days and start at HK$861 for one-way flights and HK$1,762 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Bangkok Airways
Thu, 3 Sept - Mon, 7 Sept
HKT
Phuket
USM
Koh Samui
HK$1,762 Return, found 3 days ago
HK$1,762
Return
found 3 days ago
Select Bangkok Airways flight, departing Thu, 3 Sept from Phuket to Koh Samui, returning Mon, 7 Sept, priced at HK$1,762 found 3 days ago
Scoot
Tue, 6 Oct - Sun, 11 Oct
SIN
Singapore
USM
Koh Samui
HK$2,183 Return, found 6 days ago
HK$2,183
Return
found 6 days ago
Select Scoot flight, departing Tue, 6 Oct from Singapore to Koh Samui, returning Sun, 11 Oct, priced at HK$2,183 found 6 days ago
Singapore Airlines
Wed, 14 Oct - Sun, 18 Oct
HKG
Hong Kong SAR
USM
Koh Samui
HK$3,449 Return, found 5 days ago
HK$3,449
Return
found 5 days ago
Select Singapore Airlines flight, departing Wed, 14 Oct from Hong Kong SAR to Koh Samui, returning Sun, 18 Oct, priced at HK$3,449 found 5 days ago
Thai Airways International
Fri, 18 Sept - Tue, 22 Sept
HKG
Hong Kong SAR
USM
Koh Samui
HK$3,961 Return, found 6 hours ago
HK$3,961
Return
found 6 hours ago
Select Thai Airways International flight, departing Fri, 18 Sept from Hong Kong SAR to Koh Samui, returning Tue, 22 Sept, priced at HK$3,961 found 6 hours ago
EVA Airways
Thu, 15 Oct - Mon, 19 Oct
HKG
Hong Kong SAR
USM
Koh Samui
HK$4,345 Return, found 3 hours ago
HK$4,345
Return
found 3 hours ago
Select EVA Airways flight, departing Thu, 15 Oct from Hong Kong SAR to Koh Samui, returning Mon, 19 Oct, priced at HK$4,345 found 3 hours ago

Frequently asked questions

How do I find cheap flights to Koh Madsum that have flexible change policies?
Search for low-cost flights to Koh Madsum, then mark the "No change fee" box directly below the "Flexible change policies" heading. It's that simple. We know that travel plans change and flexibility matters, so book with confidence with Expedia.
How can I find cheap tickets to Koh Madsum?
An effective strategy for finding cheap fares is to be flexible with your travel dates. Start by searching for your flight to Koh Madsum, then click on the "flexible dates" box to see prices for nearby days. Another handy tip? Book well ahead of time. To give you an idea of fares, HK$1,762 was the best price for a flight to Koh Madsum in the last seven days.
How much is a flight to Koh Madsum?
The cost of a round-trip flight to Koh Madsum in the last seven days fluctuated between HK$1,762 and HK$4,345. If you were journeying one way out of Phuket (HKT), you could have nabbed a cheap seat from just HK$861.
When is the cheapest time to fly to Koh Madsum?
Take off for Koh Madsum early in the week and you'll usually be rewarded with lower-priced fares. Tuesday is known for being the cheapest day to hop on a plane, followed by Monday. If you're eager to avoid the priciest flights, stay away from Saturdays.
How much is a plane ticket to Koh Madsum?
In the last seven days, plane fares cost between HK$1,762 and HK$4,345. Have a look at our fantastic deals to Koh Madsum, pick your favorite and then start packing!
What months are the cheapest to book a flight to Koh Madsum?
The ideal month to purchase cheap fares to Koh Madsum is February. It's worth remembering that in the United States, an expensive time to secure a seat is the month of December.

Travel information

Destination airport
Samui Intl. Airport
Destination airport IATA code
USM
Destination city name
Samui Intl. Airport
Return price
HK$1,762

Trending flights to Koh Madsum

Prices were available within the past 7 days and start at HK$861 for one-way flights and HK$1,762 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Scoot
Mon, 19 Oct - Fri, 23 Oct
HKG
Hong Kong SAR
USM
Koh Samui
HK$3,179 Return, found 4 hours ago
HK$3,179
Return
found 4 hours ago
Select Scoot flight, departing Mon, 19 Oct from Hong Kong SAR to Koh Samui, returning Fri, 23 Oct, priced at HK$3,179 found 4 hours ago
*Available to Expedia members.