SFO - USM

฿15,184 Find Cheap Flights from San Francisco to Ko Samui – Compare and Save

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Everything you should know

Cheapest return flight
฿27,230
Typical prices: ฿30,373-฿48,187
Singapore Airlines
Sat 27/1Thu 22/2
SFO - USM • 1 stop
Cheapest one-way flight
฿15,184
Typical prices: ฿16,193-฿20,829
Singapore Airlines
Sun 21/1
SFO - USM • 1 stop
When to travel
October
Cheapest • 19% price drop
August
Most popular
Good to know
+1
Good to know
+1
Top stopover airports
Singapore Changi (SIN)
Cheapest • Avg ฿41,032 (return)
Hong Kong Intl (HKG)
Shortest trip • 26h 14m (one-way)
Insights
Insights
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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

Wed 27 Jan - Mon 22 Feb
Singapore Airlines Logo
09:40 - 18:55SFO  San Francisco-USM Ko Samui
42h 15m1 stop Singapore Changi
Singapore Airlines Logo
08:55 - 07:50USM  Ko Samui-SFO San Francisco
37h 55m1 stop Singapore Changi
฿27,230Singapore Airlines
1 day ago
Wed 20 Jan - Tue 2 Feb
Multiple Airlines Logo
22:55 - 14:55SFO  San Francisco-USM Ko Samui
25h 00m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
11:40 - 21:15USM  Ko Samui-SFO San Francisco
24h 35m1 stop Hong Kong Intl
฿27,736Multiple Airlines
3+ days ago
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
20:20 - 09:45USM  Ko Samui-SFO San Francisco
28h 25m2 stops Bangkok Suvarnabhumi Hong Kong Intl
฿28,681Multiple Airlines
3+ days ago
Tue 2 Mar - Thu 11 Mar
Multiple Airlines Logo
11:25 - 07:10SFO  San Francisco-USM Ko Samui
28h 45m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
08:40 - 21:15USM  Ko Samui-SFO San Francisco
27h 35m2 stops Bangkok Suvarnabhumi Hong Kong Intl
฿29,727Multiple Airlines
3+ days ago
Wed 20 Jan - Tue 2 Feb
Singapore Airlines Logo
09:40 - 18:55SFO  San Francisco-USM Ko Samui
42h 15m1 stop Singapore Changi
Singapore Airlines Logo
08:55 - 07:50USM  Ko Samui-SFO San Francisco
37h 55m1 stop Singapore Changi
฿30,132Singapore Airlines
3+ days ago
Mon 1 Mar - Thu 4 Mar
Singapore Airlines Logo
09:40 - 18:55SFO  San Francisco-USM Ko Samui
42h 15m1 stop Singapore Changi
Singapore Airlines Logo
08:55 - 07:50USM  Ko Samui-SFO San Francisco
37h 55m1 stop Singapore Changi
฿30,200Singapore Airlines
3+ days ago
Wed 27 Jan - Mon 22 Feb
Singapore Airlines Logo
09:40 - 18:55SFO  San Francisco-USM Ko Samui
42h 15m1 stop Singapore Changi
Singapore Airlines Logo
08:55 - 07:50USM  Ko Samui-SFO San Francisco
37h 55m1 stop Singapore Changi
฿31,178Singapore Airlines
3+ days ago
Fri 19 Mar - Tue 23 Mar
Singapore Airlines Logo
10:40 - 18:55SFO  San Francisco-USM Ko Samui
42h 15m1 stop Singapore Changi
Singapore Airlines Logo
08:55 - 08:50USM  Ko Samui-SFO San Francisco
37h 55m1 stop Singapore Changi
฿31,650Singapore Airlines
1 day ago
Wed 27 Jan - Mon 22 Feb
Multiple Airlines Logo
22:55 - 19:35SFO  San Francisco-USM Ko Samui
29h 40m1 stop Hong Kong Intl
Multiple Airlines Logo
16:30 - 21:15USM  Ko Samui-SFO San Francisco
19h 45m2 stops Bangkok Suvarnabhumi Hong Kong Intl
฿32,528Multiple Airlines
3+ days ago
Tue 23 Mar - Thu 1 Apr
Cathay Pacific Logo
23:55 - 07:10SFO  San Francisco-USM Ko Samui
41h 15m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Cathay Pacific Logo
11:55 - 10:55USM  Ko Samui-SFO San Francisco
37h 00m1 stop Hong Kong Intl
฿33,169Cathay Pacific
1 day ago
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 with more confidence.

How much is a return flight from San Francisco to Ko Samui?

Return flights from San Francisco to Ko Samui typically range from ฿30,373 to ฿48,187. The lowest price found in the past 5 days was ฿27,230 on Singapore Airlines.

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

Based on deals KAYAK users found in the last 12 months, Sunday is the cheapest day of the week to fly from San Francisco to Ko Samui. It's 15% cheaper than the average day, while Thursday is the most expensive, with prices 30% higher.

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 ฿29,828 return.
•December (฿89,451) and July (฿55,506) 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

฿15,184
Beat the crowds with an average 46% drop in travellers.
The most popular month to fly with an average 38% increase in travellers.
One-way flight 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 answers about this route, including flight times, airports, airlines, and booking tips.

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

    There are currently no direct flights available from San Francisco to Ko Samui. Flights with 1 stopover take between 26h 14m and 28h 33m in total, depending on the connection.

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

    Return flights from San Francisco to Ko Samui range from ฿30,373 to ฿48,187, with an average of ฿36,977 over the past 12 months. Anything below ฿30,373 counts as a good deal.

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

    One-way fares from San Francisco to Ko Samui are currently higher than usual. Average one-way flight prices are about ฿25,000, which is 32% above the typical average for this route.

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

    Ko Samui Airport (USM) hosts 5 major car rental companies, with daily rates starting from around ฿430 for economy cars. Top options include:

    • Drive Car Rental
    • Alamo
    • Sixt
    • Enterprise Rent-A-Car
    • Thai Rent

  • 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

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

    Yes. Flexible dates can save you up to 35% on flights from San Francisco to Ko Samui. Sunday is the cheapest departure day at ฿31,785 return on average, while Thursday is the most expensive at ฿48,184, a difference of ฿16,399.

    Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

  • 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 33m 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.

  • What popular places can I visit in Ko Samui?

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

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 Sunday departure and avoid flying on Thursday. On this route, Sunday flights average ฿31,785, which is about ฿16,399 less than Thursday fares (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 ฿29,828 return in that month – typically ฿59,623 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
    • Melia Koh Samui
    • Royal Muang Samui Villas

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