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.
Yes, there are multiple flights from Koh Samui to Kathmandu for under ฿32,800. The cheapest flight booked recently is on Multiple Airlines for just ฿32,745, but on average you can expect to pay ฿37,475.
Information is based on travel restrictions from Koh Samui to Kathmandu Tribhuvan
Most visitors from Koh Samui need to provide a negative COVID-19 test result and/or quarantine to enter Kathmandu Tribhuvan.
COVID-19 testing requirements
Visitors from Koh Samui must present a negative RT-PCR (NAAT) test taken 72 hours before departing to Kathmandu Tribhuvan.
Quarantine requirements
Visitors from Koh Samui are not required to quarantine after entering Kathmandu Tribhuvan.
Documents
Health Declaration Form - Travelers are required to complete a health declaration form before departure to Nepal. Once the form is completed the traveler will receive a barcode that must be saved or printed so it may be presented to immigration on arrival.
Returning to Koh Samui from Kathmandu Tribhuvan
COVID-19 testing requirements
Visitors from Kathmandu Tribhuvan must present a negative RT-PCR (NAAT) test taken 72 hours before departing to Koh Samui.
Quarantine requirements
Visitors from Kathmandu Tribhuvan are not required to quarantine after entering Koh Samui.