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Cheap flights from San Francisco to Ko Samui from $449

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Francisco to Ko Samui departing on 1/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from San Francisco to Ko Samui

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
12:20 am - 7:40 pmSFO  San Francisco-USM Ko Samui
29h 20m1 stop Hong Kong Intl
Multiple Airlines Logo
9:15 am - 10:55 amUSM  Ko Samui-SFO San Francisco
39h 40m2 stops Bangkok Suvarnabhumi Hong Kong Intl
$834Multiple Airlines
Sun, Sep 20 - Mon, Oct 5
Multiple Airlines Logo
2:00 pm - 7:00 amSFO  San Francisco-USM Ko Samui
27h 00m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
11:55 am - 11:15 pmUSM  Ko Samui-SFO San Francisco
25h 20m1 stop Hong Kong Intl
$834Multiple Airlines
Thu, Aug 27 - Sat, Sep 5
Multiple Airlines Logo
1:20 am - 1:40 pmSFO  San Francisco-USM Ko Samui
22h 20m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
8:50 pm - 11:15 pmUSM  Ko Samui-SFO San Francisco
40h 25m2 stops Bangkok Suvarnabhumi Hong Kong Intl
$834Multiple Airlines
Wed, Aug 26 - Sat, Sep 5
Multiple Airlines Logo
1:00 pm - 7:10 amSFO  San Francisco-USM Ko Samui
28h 10m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
6:55 pm - 10:55 amUSM  Ko Samui-SFO San Francisco
30h 00m2 stops Bangkok Suvarnabhumi Hong Kong Intl
$836Multiple Airlines
Mon, Sep 21 - Mon, Oct 5
Singapore Airlines Logo
9:40 am - 8:00 amSFO  San Francisco-USM Ko Samui
31h 20m1 stop Singapore Changi
Singapore Airlines Logo
12:00 pm - 7:50 amUSM  Ko Samui-SFO San Francisco
34h 50m1 stop Singapore Changi
$931Singapore Airlines
Sun, Nov 1 - Sat, Nov 7
Singapore Airlines Logo
9:40 am - 8:00 amSFO  San Francisco-USM Ko Samui
31h 20m1 stop Singapore Changi
Singapore Airlines Logo
8:55 am - 7:50 amUSM  Ko Samui-SFO San Francisco
37h 55m1 stop Singapore Changi
$934Singapore Airlines
Sun, Nov 22 - Tue, Dec 1
Singapore Airlines Logo
9:40 am - 8:00 amSFO  San Francisco-USM Ko Samui
31h 20m1 stop Singapore Changi
Singapore Airlines Logo
12:00 pm - 7:50 amUSM  Ko Samui-SFO San Francisco
34h 50m1 stop Singapore Changi
$949Singapore Airlines
Sun, Nov 1 - Sat, Nov 7
EVA Air Logo
1:25 am - 4:50 pmSFO  San Francisco-USM Ko Samui
25h 25m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi
EVA Air Logo
2:00 pm - 8:10 pmUSM  Ko Samui-SFO San Francisco
20h 10m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl
$1,044EVA Air
Tue, Sep 8 - Thu, Sep 24
EVA Air Logo
1:10 am - 2:45 pmSFO  San Francisco-USM Ko Samui
23h 35m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi
EVA Air Logo
8:20 pm - 6:40 amUSM  Ko Samui-SFO San Francisco
25h 20m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl
$1,044EVA Air
Mon, Oct 12 - Mon, Nov 30
EVA Air Logo
1:00 am - 3:25 pmSFO  San Francisco-USM Ko Samui
24h 25m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi
EVA Air Logo
1:50 pm - 8:10 pmUSM  Ko Samui-SFO San Francisco
20h 20m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl
$1,044EVA Air
Tue, Sep 8 - Thu, Sep 24

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Singapore Airlines flights from San Francisco to Ko Samui

Our best Singapore Airlines deals on San Francisco to Ko Samui flight tickets
Singapore Airlines
Nov 1
SFO9:40 amSan Francisco
31h 20m
1 stop
USM8:00 amKo Samui
Nov 7
USM12:00 pmKo Samui
34h 50m
1 stop
SFO7:50 amSan Francisco
$931
Singapore Airlines
Nov 22
SFO9:40 amSan Francisco
31h 20m
1 stop
USM8:00 amKo Samui
Dec 1
USM8:55 amKo Samui
37h 55m
1 stop
SFO7:50 amSan Francisco
$934
Singapore Airlines
Nov 1
SFO9:40 amSan Francisco
31h 20m
1 stop
USM8:00 amKo Samui
Nov 7
USM12:00 pmKo Samui
34h 50m
1 stop
SFO7:50 amSan Francisco
$949

EVA Air flights from San Francisco to Ko Samui

Our best EVA Air deals on San Francisco to Ko Samui flight tickets
EVA Air
Sep 8
SFO1:25 amSan Francisco
25h 25m
2 stops
USM4:50 pmKo Samui
Sep 24
USM2:00 pmKo Samui
20h 10m
2 stops
SFO8:10 pmSan Francisco
$1,044
EVA Air
Nov 22
SFO12:00 pmSan Francisco
28h 45m
2 stops
USM7:45 amKo Samui
Nov 30
USM7:10 pmKo Samui
34h 50m
2 stops
SFO3:00 pmSan Francisco
$1,082
EVA Air
Oct 18
SFO1:10 amSan Francisco
22h 35m
2 stops
USM1:45 pmKo Samui
Oct 22
USM11:45 amKo Samui
22h 15m
2 stops
SFO8:00 pmSan Francisco
$1,105

momondo Fare Finder

 
Customize your flight search to find flights from San Francisco to Ko Samui that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 15, 2026.
Use the filters below to find and compare flights from San Francisco to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Sun 9/20

12:20 am-7:40 pm

1 stop29h 20m

Ko Samui

Mon 10/5

9:15 am-10:55 am

2 stops39h 40m

$834

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Thu 8/27

2:00 pm-7:00 am

2 stops27h 00m

Ko Samui

Sat 9/5

11:55 am-11:15 pm

1 stop25h 20m

$834

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Wed 8/26

1:20 am-1:40 pm

2 stops22h 20m

Ko Samui

Sat 9/5

8:50 pm-11:15 pm

2 stops40h 25m

$834

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Mon 9/21

1:00 pm-7:10 am

2 stops28h 10m

Ko Samui

Mon 10/5

6:55 pm-10:55 am

2 stops30h 00m

$836

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Sun 11/1

9:40 am-8:00 am

1 stop31h 20m

Ko Samui

Sat 11/7

12:00 pm-7:50 am

1 stop34h 50m

$931

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Sun 11/22

9:40 am-8:00 am

1 stop31h 20m

Ko Samui

Tue 12/1

8:55 am-7:50 am

1 stop37h 55m

$934

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Sun 11/1

9:40 am-8:00 am

1 stop31h 20m

Ko Samui

Sat 11/7

12:00 pm-7:50 am

1 stop34h 50m

$949

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Tue 9/8

1:25 am-4:50 pm

2 stops25h 25m

Ko Samui

Thu 9/24

2:00 pm-8:10 pm

2 stops20h 10m

$1,044

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Mon 10/12

1:10 am-2:45 pm

2 stops23h 35m

Ko Samui

Mon 11/30

8:20 pm-6:40 am

2 stops25h 20m

$1,044
Quickest round-trip

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Tue 9/8

1:00 am-3:25 pm

2 stops24h 25m

Ko Samui

Thu 9/24

1:50 pm-8:10 pm

2 stops20h 20m

$1,044

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from San Francisco to Ko Samui

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Can stopping save me money on San Francisco to Ko Samui flights?

You could potentially save up to 10% on your flight if you consider stops on a San Francisco to Ko Samui flight.

When to book flights from San Francisco to Ko Samui

Are you open to changing your travel dates? Check out the ideal times to fly from San Francisco to Ko Samui according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap San Francisco to Ko Samui (SFO to USM) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from San Francisco to Ko Samui

Fastest flight time

27h 00m

Direct flights

None
The fastest flight from San Francisco to Ko Samui takes 27h 00m
There are no direct flights from San Francisco to Ko Samui. There are no popular flight routes from San Francisco to Ko Samui.
Search flight deals

Frequently asked questions about flying from San Francisco to Ko Samui

  • How far is San Francisco to Ko Samui by plane?

    San Francisco and Ko Samui are 8166.7 mi apart from one another. In terms of flight time, this usually takes a little over 27h 00m.

  • When did momondo last update prices for flights from San Francisco Airport to Ko Samui Airport?

    Prices for flights from San Francisco Airport to Ko Samui Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from San Francisco Airport to Ko Samui Airport?

  • How old do you have to be to fly from San Francisco Airport to Ko Samui Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from San Francisco Airport to Ko Samui Airport.

  • What documentation or ID do you need to fly to Ko Samui Airport?

    The travel and health documents required for your trip to Ko Samui Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ko Samui Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from San Francisco to Ko Samui?

Best airlines flying from San Francisco to Ko Samui

Compare and see reviews for airlines that fly from San Francisco to Ko Samui with momondo
Airline
Rating
Free Cancellation
Price
Singapore AirlinesPriceFrom $817Free CancellationRating
8.2
1,583 reviews
Search Singapore Airlines flights
EVA AirPriceFrom $940Free CancellationRating
8.5
1,517 reviews
Search EVA Air flights

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Pha Ngan
Ko Tao
Khanom

Why use momondo?

Why should I use momondo to find a flight deal from San Francisco to Ko Samui?

It is quick and easy to find San Francisco to Ko Samui flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Ko Samui that suits you.

Can I find flights from San Francisco to Ko Samui with flexible booking policies on momondo?

Flights from San Francisco to Ko Samui with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from San Francisco to Ko Samui?

momondo provides multiple filters to help you find the best flight to Ko Samui from San Francisco. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from San Francisco to Ko Samui right now. Can momondo alert me if prices change?

Yes. momondo can track prices for San Francisco to Ko Samui flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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