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Cheap flights from San Francisco to Ko Samui from $423

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 1/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from San Francisco to Ko Samui (SFO-USM)

Cheap round-trip flights

Logo
10:40 pm - 6:15 pmSFO-USM
29h 35m1 stop
Logo
8:20 am - 9:15 amUSM-SFO
38h 55m1 stop
$657
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Tue, Sep 30 - Tue, Oct 7
Logo
10:50 am - 6:35 pmSFO-USM
41h 45m2 stops
Logo
1:30 pm - 9:15 amUSM-SFO
33h 45m1 stop
$661
Find Deal
Tue, Sep 30 - Tue, Oct 7
Logo
7:25 am - 6:35 pmSFO-USM
45h 10m2 stops
Logo
10:55 am - 11:56 amUSM-SFO
39h 01m2 stops
$681
Find Deal
Tue, Sep 30 - Tue, Oct 7
Singapore Airlines Logo
11:30 am - 11:10 amSFO-USM
33h 40m1 stop
Singapore Airlines Logo
7:45 pm - 7:50 amUSM-SFO
27h 05m1 stop
$753Singapore Airlines
Find Deal
Wed, Oct 22 - Tue, Nov 11
Singapore Airlines Logo
12:00 pm - 7:50 amSFO-USM
29h 50m1 stop
Singapore Airlines Logo
12:05 pm - 9:40 amUSM-SFO
35h 35m1 stop
$794Singapore Airlines
Find Deal
Thu, Sep 11 - Mon, Sep 22
Singapore Airlines Logo
12:00 pm - 7:50 amSFO-USM
29h 50m1 stop
Singapore Airlines Logo
7:25 pm - 9:40 amUSM-SFO
28h 15m1 stop
$797Singapore Airlines
Find Deal
Mon, Sep 8 - Mon, Oct 13
Singapore Airlines Logo
12:00 pm - 7:50 amSFO-USM
29h 50m1 stop
Singapore Airlines Logo
7:25 pm - 9:40 amUSM-SFO
28h 15m1 stop
$952Singapore Airlines
Find Deal
Tue, Sep 30 - Tue, Oct 7
EVA Air Logo
1:10 am - 8:30 pmSFO-USM
29h 20m2 stops
EVA Air Logo
1:55 pm - 6:40 pmUSM-SFO
19h 45m2 stops
$997EVA Air
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Tue, Oct 21 - Tue, Nov 11
EVA Air Logo
1:25 am - 1:45 pmSFO-USM
22h 20m2 stops
EVA Air Logo
7:30 pm - 6:50 amUSM-SFO
25h 20m2 stops
$998EVA Air
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Tue, Sep 9 - Sun, Sep 21
EVA Air Logo
12:30 pm - 8:15 amSFO-USM
29h 45m2 stops
EVA Air Logo
8:00 am - 4:00 pmUSM-SFO
22h 00m2 stops
$1,012EVA Air
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Thu, Oct 2 - Thu, Oct 9

Singapore Airlines flights from San Francisco to Ko Samui

Our best Singapore Airlines deals on San Francisco to Ko Samui flight tickets
Singapore Airlines
Oct 22
SFO11:30 amSan Francisco
33h 40m
1 stop
USM11:10 amKo Samui
Nov 11
USM7:45 pmKo Samui
27h 05m
1 stop
SFO7:50 amSan Francisco
$753
Find similar
Singapore Airlines
Sep 11
SFO12:00 pmSan Francisco
29h 50m
1 stop
USM7:50 amKo Samui
Sep 22
USM12:05 pmKo Samui
35h 35m
1 stop
SFO9:40 amSan Francisco
$794
Find similar
Singapore Airlines
Sep 8
SFO12:00 pmSan Francisco
29h 50m
1 stop
USM7:50 amKo Samui
Oct 13
USM7:25 pmKo Samui
28h 15m
1 stop
SFO9:40 amSan Francisco
$797
Find similar

EVA Air flights from San Francisco to Ko Samui

Our best EVA Air deals on San Francisco to Ko Samui flight tickets
EVA Air
Oct 21
SFO1:10 amSan Francisco
29h 20m
2 stops
USM8:30 pmKo Samui
Nov 11
USM1:55 pmKo Samui
19h 45m
2 stops
SFO6:40 pmSan Francisco
$997
Find similar
EVA Air
Sep 9
SFO1:25 amSan Francisco
22h 20m
2 stops
USM1:45 pmKo Samui
Sep 21
USM7:30 pmKo Samui
25h 20m
2 stops
SFO6:50 amSan Francisco
$998
Find similar
EVA Air
Oct 2
SFO12:30 pmSan Francisco
29h 45m
2 stops
USM8:15 amKo Samui
Oct 9
USM8:00 amKo Samui
22h 00m
2 stops
SFO4:00 pmSan Francisco
$1,012
Find similar

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 18, 2025.
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

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Tue 9/30

10:40 pm-6:15 pm

1 stop29h 35m

Ko Samui

Tue 10/7

8:20 am-9:15 am

1 stop38h 55m

$657

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Tue 9/30

10:50 am-6:35 pm

2 stops41h 45m

Ko Samui

Tue 10/7

1:30 pm-9:15 am

1 stop33h 45m

$661

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Tue 9/30

7:25 am-6:35 pm

2 stops45h 10m

Ko Samui

Tue 10/7

10:55 am-11:56 am

2 stops39h 01m

$681

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Wed 10/22

11:30 am-11:10 am

1 stop33h 40m

Ko Samui

Tue 11/11

7:45 pm-7:50 am

1 stop27h 05m

$753

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Thu 9/11

12:00 pm-7:50 am

1 stop29h 50m

Ko Samui

Mon 9/22

12:05 pm-9:40 am

1 stop35h 35m

$794

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Mon 9/8

12:00 pm-7:50 am

1 stop29h 50m

Ko Samui

Mon 10/13

7:25 pm-9:40 am

1 stop28h 15m

$797

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Tue 9/30

12:00 pm-7:50 am

1 stop29h 50m

Ko Samui

Tue 10/7

7:25 pm-9:40 am

1 stop28h 15m

$952

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Tue 10/21

1:10 am-8:30 pm

2 stops29h 20m

Ko Samui

Tue 11/11

1:55 pm-6:40 pm

2 stops19h 45m

$997

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Tue 9/9

1:25 am-1:45 pm

2 stops22h 20m

Ko Samui

Sun 9/21

7:30 pm-6:50 am

2 stops25h 20m

$998

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Thu 10/2

12:30 pm-8:15 am

2 stops29h 45m

Ko Samui

Thu 10/9

8:00 am-4:00 pm

2 stops22h 00m

$1,012

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Ko Samui from

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

What is the cheapest month to fly to Ko Samui?

In general, October is the cheapest month to fly from San Francisco to Ko Samui. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $1,052. If you don’t want to visit Ko Samui in October, then you should wait until January to fly from San Francisco, when ticket prices are also cheap, with an average price of $1,088.

What is the cheapest day to depart on your flight to Ko Samui?

Our data shows that Monday is the least expensive day to fly to Ko Samui. Tickets to fly out on this day can be as low as $382. Flights from San Francisco to Ko Samui on a Friday will generally be more expensive and average around $515. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Ko Samui?

Our data shows that the cheapest San Francisco to Ko Samui flights are usually those with departure times at noon. Our users have found flights to Ko Samui at noon for as low as $310. In the morning is when there is more demand to fly to Ko Samui, so prices are often more expensive at around $433 per ticket.

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

You could potentially save up to 51% 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

Best Price Found

$423

Fastest flight time

19h 55m

Direct flights

None

Airports in Ko Samui

1 airport
The best one-way flight to Ko Samui from San Francisco in the past 72 hours is $423. The best round-trip flight deal from San Francisco to Ko Samui found on momondo in the last 72 hours is $657.
The fastest flight from San Francisco to Ko Samui takes 19h 55m
There are no direct flights from San Francisco to Ko Samui. Popular non-direct route for this connection is San Francisco Airport - Ko Samui Airport.
There is 1 airport near Ko Samui: Ko Samui (USM)
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  • How far is San Francisco to Ko Samui by plane?

    San Francisco and Ko Samui are 8165.8 mi apart from one another. In terms of flight time, this usually takes a little over 22h 20m.

  • 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 $821Free CancellationRating
8.1
1,347 reviews
Search Singapore Airlines flights
EVA AirPriceFrom $1,048Free CancellationRating
8.4
1,232 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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