Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Koh Samui to Kathmandu as you normally would.
Related info for your journey
Useful info, stats and facts about Koh Samui to Kathmandu flights.
This is defined as Ko Samui Airport (USM) and Kathmandu Tribhuvan Airport (KTM). Codes like Kathmandu Tribhuvan Airport are often used to just call airports uniquely.
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