Flights to Koh Samui from San Francisco

View ฿15,115 flight on Mon, 29 Sep 2025Opens in a new window

Popular airlines from San Francisco to Koh Samui

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Cheap Flights from San Francisco (SJC) to Koh Samui (USM)

Prices were available within the past 7 days and start at ฿15,115 for one-way flights and ฿39,085 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, 7 Jul - Mon, 21 Jul
SFO
San Francisco
USM
Koh Samui
฿39,085 Return, found 1 day ago
฿39,085
Return
found 1 day ago
Select United flight, departing Mon, 7 Jul from San Francisco to Koh Samui, returning Mon, 21 Jul, priced at ฿39,085 found 1 day ago
United
Mon, 7 Jul - Mon, 21 Jul
SFO
San Francisco
USM
Koh Samui
฿39,270 Return, found 1 day ago
฿39,270
Return
found 1 day ago
Select United flight, departing Mon, 7 Jul from San Francisco to Koh Samui, returning Mon, 21 Jul, priced at ฿39,270 found 1 day ago
China Airlines
Mon, 7 Jul - Mon, 21 Jul
SFO
San Francisco
USM
Koh Samui
฿45,600 Return, found 1 day ago
฿45,600
Return
found 1 day ago
Select China Airlines flight, departing Mon, 7 Jul from San Francisco to Koh Samui, returning Mon, 21 Jul, priced at ฿45,600 found 1 day ago
EVA Airways
Mon, 7 Jul - Mon, 21 Jul
SFO
San Francisco
USM
Koh Samui
฿47,260 Return, found 1 day ago
฿47,260
Return
found 1 day ago
Select EVA Airways flight, departing Mon, 7 Jul from San Francisco to Koh Samui, returning Mon, 21 Jul, priced at ฿47,260 found 1 day ago
Qatar Airways
Sun, 13 Jul - Thu, 17 Jul
SFO
San Francisco
USM
Koh Samui
฿70,610 Return, found 1 day ago
฿70,610
Return
found 1 day ago
Select Qatar Airways flight, departing Sun, 13 Jul from San Francisco to Koh Samui, returning Thu, 17 Jul, priced at ฿70,610 found 1 day ago
Cathay Pacific
Sun, 13 Jul - Thu, 17 Jul
SFO
San Francisco
USM
Koh Samui
฿82,305 Return, found 1 day ago
฿82,305
Return
found 1 day ago
Select Cathay Pacific flight, departing Sun, 13 Jul from San Francisco to Koh Samui, returning Thu, 17 Jul, priced at ฿82,305 found 1 day ago

Find the cheapest month to fly from San Francisco (SFO) to Koh Samui (USM)

September is typically the cheapest month to fly

From ฿27,411 - ฿38,938 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.