SFO - USM

฿15,045 Find Cheap Flights from San Francisco to Ko Samui – Compare and Save

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Everything you should know

Cheapest return flight
฿27,516
Typical prices: ฿31,095-฿47,116
Multiple Airlines
Fri 26/10Sat 10/11
SFO - USM • 2 stops
Cheapest one-way flight
฿15,045
Typical prices: ฿16,693-฿20,367
Multiple Airlines
Sun 21/1
SFO - USM • 2 stops
Direct flights
Not available
There are currently no direct flights between San Francisco and Ko Samui. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
October
Cheapest • 23% price drop
May
Most popular
Good to know
+1
Good to know
+1
Top stopover airports
Singapore Changi (SIN)
Cheapest • Avg ฿39,234 (return)
Hong Kong Intl (HKG)
Shortest trip • 26h 14m (one-way)
Insights
Insights
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We hope you enjoy your trip to Ko Samui!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from San Francisco to Ko Samui (SFO-USM)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from San Francisco to Ko Samui

Sat 17 Oct - Mon 16 Nov
Multiple Airlines Logo
00:20 - 15:10SFO  San Francisco-USM Ko Samui
24h 50m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
14:15 - 20:55USM  Ko Samui-SFO San Francisco
21h 40m2 stops Bangkok Suvarnabhumi Hong Kong Intl
฿27,450Multiple Airlines
Sun 18 Oct - Mon 16 Nov
Multiple Airlines Logo
13:00 - 19:40SFO  San Francisco-USM Ko Samui
40h 40m1 stop Hong Kong Intl
Multiple Airlines Logo
10:20 - 20:55USM  Ko Samui-SFO San Francisco
25h 35m2 stops Bangkok Suvarnabhumi Hong Kong Intl
฿27,516Multiple Airlines
Wed 27 Jan - Mon 22 Feb
Multiple Airlines Logo
22:55 - 14:55SFO  San Francisco-USM Ko Samui
25h 00m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
13:45 - 21:15USM  Ko Samui-SFO San Francisco
22h 30m2 stops Bangkok Suvarnabhumi Hong Kong Intl
฿27,879Multiple Airlines
Sun 1 Nov - Sat 14 Nov
Multiple Airlines Logo
22:55 - 15:35SFO  San Francisco-USM Ko Samui
25h 40m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
14:05 - 20:55USM  Ko Samui-SFO San Francisco
21h 50m2 stops Bangkok Suvarnabhumi Hong Kong Intl
฿28,044Multiple Airlines
Sun 1 Nov - Sat 14 Nov
Multiple Airlines Logo
22:55 - 15:35SFO  San Francisco-USM Ko Samui
25h 40m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
14:05 - 20:55USM  Ko Samui-SFO San Francisco
21h 50m2 stops Bangkok Suvarnabhumi Hong Kong Intl
฿28,209Multiple Airlines
Thu 11 Feb - Sat 20 Feb
Multiple Airlines Logo
22:55 - 14:55SFO  San Francisco-USM Ko Samui
25h 00m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
14:05 - 21:15USM  Ko Samui-SFO San Francisco
22h 10m2 stops Bangkok Suvarnabhumi Hong Kong Intl
฿28,440Multiple Airlines
Mon 26 Oct - Tue 10 Nov
Singapore Airlines Logo
10:40 - 17:10SFO  San Francisco-USM Ko Samui
40h 30m1 stop Singapore Changi
Singapore Airlines Logo
18:05 - 07:50USM  Ko Samui-SFO San Francisco
28h 45m1 stop Singapore Changi
฿28,869Singapore Airlines
Sun 11 Oct - Sun 18 Oct
Singapore Airlines Logo
11:45 - 18:50SFO  San Francisco-USM Ko Samui
41h 05m1 stop Singapore Changi
Singapore Airlines Logo
08:40 - 09:50USM  Ko Samui-SFO San Francisco
39h 10m1 stop Singapore Changi
฿29,595Singapore Airlines
Tue 3 Nov - Fri 13 Nov
Multiple Airlines Logo
11:25 - 07:10SFO  San Francisco-USM Ko Samui
28h 45m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
10:20 - 20:55USM  Ko Samui-SFO San Francisco
25h 35m2 stops Bangkok Suvarnabhumi Hong Kong Intl
฿30,419Multiple Airlines
Sun 18 Oct - Mon 16 Nov
Singapore Airlines Logo
11:45 - 18:50SFO  San Francisco-USM Ko Samui
41h 05m1 stop Singapore Changi
Singapore Airlines Logo
12:00 - 07:50USM  Ko Samui-SFO San Francisco
34h 50m1 stop Singapore Changi
฿30,452Singapore Airlines
Booking Insights

Price, demand, and travel trends for San Francisco to Ko Samui flights

Use KAYAK data on prices, travel dates, airlines, and seasonal trends to compare options and book flights from San Francisco to Ko Samui with more confidence.

What's the cheapest day of the week to fly from San Francisco to Ko Samui?

Monday is the cheapest day of the week to fly from San Francisco to Ko Samui and is 18% cheaper than the average day. Thursday is the most expensive day with flight prices 25% higher than average. Based on deals found by KAYAK users in the last 12 months.

What is the cheapest month to fly from San Francisco to Ko Samui?

  • October is the cheapest month to fly from San Francisco to Ko Samui at ฿29,166 return.
  • December (฿87,464) and July (฿54,273) are the most expensive months.
  • The price difference between flying in the cheapest and most expensive months is 199% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

Find deals

Key details for San Francisco to Ko Samui flights

Low season

November

Cheapest flight

฿15,045
Best time to beat the crowds (18% less expensive on average)
Most popular time to fly (5% more expensive on average)
Flights from San Francisco to Ko Samui

When to book flights from San Francisco to Ko Samui

Are your dates flexible? Find out the best times to travel from San Francisco to Ko Samui based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price

Your San Francisco to Ko Samui flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines, and booking questions.

  • Which airports can I use when flying from San Francisco to Ko Samui?

    Flights from San Francisco to Ko Samui usually depart from San Francisco (SFO) and arrive at Ko Samui (USM).

  • Which airports do connecting flights from San Francisco to Ko Samui pass through?

    Connecting flights from San Francisco to Ko Samui most commonly pass through:

    • Singapore Changi (SIN) – 98% of one-stop connections
    • Hong Kong Intl (HKG) – 2% of one-stop connections
    Together, these airports account for 100% of one-stop bookings on this route.

  • Can I save money by using flexible dates for flights from San Francisco to Ko Samui?

    Yes. Being flexible with your travel dates can save you up to 35% on the San Francisco to Ko Samui route. Monday is the cheapest departure day at ฿31,013 return on average, while Thursday is the most expensive at ฿47,345, a difference of ฿16,331. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • What popular places can I visit in Ko Samui?

    Some of the most popular sights in Ko Samui are Chaweng Beach, Lamai Beach, and Hin Ta and Hin Yai Rocks. These are among the most viewed places in Ko Samui on KAYAK.

  • How long is a flight from San Francisco to Ko Samui?

    A direct flight from San Francisco to Ko Samui takes 0h 00m, covering 21,167 km.

  • Do I need a passport to fly from San Francisco to Ko Samui?

    Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

  • How are flight prices from San Francisco to Ko Samui looking right now?

    One-way fares from San Francisco to Ko Samui are currently lower than usual. Average one-way flight prices are about ฿16,483, which is 11% below the typical average for this route.

  • How much time can I save by choosing a different stopover airport from San Francisco to Ko Samui?

    Flying via Hong Kong Intl (HKG) gives the shortest average 1-stop total travel time of 26h 14m, compared to 28h 43m via Singapore Changi (SIN).

  • What is the time difference between San Francisco and Ko Samui?

    Ko Samui is 14 hours ahead of San Francisco (Indochina Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.

  • Which car hire options are available at Ko Samui Airport (USM)?

    Ko Samui Airport (USM) hosts 5 major car hire companies, with daily rates starting from around ฿448 for economy cars. Top options include:
    • Drive Car Rental
    • Alamo
    • Sixt
    • Enterprise Rent-A-Car
    • Hertz

  • How much should I expect to pay for a San Francisco to Ko Samui flight?

    Return flights from San Francisco to Ko Samui range from ฿31,095 to ฿47,116, with an average of ฿37,695 over the past 12 months. Anything below ฿31,095 counts as a good deal.

Your guide to booking San Francisco to Ko Samui flights

Get tips on when to book, when to fly, and what to know before your trip.
  • If your dates are flexible, aim for a Monday departure instead of Thursday. On this route, Monday flights average ฿31,013 – about ฿16,331 less than Thursday (34% savings) based on the last 12 months.
  • If you can choose when to travel, plan your San Francisco to Ko Samui trip for October. Fares historically average ฿29,166 return in that month – typically ฿58,298 less than the most expensive month, which is December (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Ko Samui Airport.
    - Ozo Chaweng Samui - Sha Extra Plus
    - Cosi Samui Chaweng Beach
    - Melia Koh Samui

More options for your flight from San Francisco to Ko Samui

Complete your trip to Ko Samui with a hotel stay or car hire

Car rentals in Ko Samui
Hotels in Ko Samui