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Cheap flights from San Francisco to Ko Samui from $454

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 11/13. 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

Cheap round-trip flights

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Singapore Airlines Logo
9:40 am - 8:00 amSFO-USM
31h 20m1 stop
Singapore Airlines Logo
8:55 am - 7:50 amUSM-SFO
37h 55m1 stop
$803Singapore Airlines
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Fri, Feb 27 - Sun, Mar 8
Singapore Airlines Logo
10:40 am - 6:50 pmSFO-USM
42h 10m1 stop
Singapore Airlines Logo
12:05 pm - 9:40 amUSM-SFO
35h 35m1 stop
$863Singapore Airlines
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Thu, Mar 26 - Thu, Apr 2
Multiple Airlines Logo
12:50 am - 2:45 pmSFO-USM
23h 55m2 stops
Multiple Airlines Logo
1:50 pm - 8:30 pmUSM-SFO
20h 40m2 stops
$881Multiple Airlines
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Fri, Apr 10 - Thu, Apr 30
Multiple Airlines Logo
12:10 am - 3:35 pmSFO-USM
25h 25m2 stops
Multiple Airlines Logo
10:05 am - 8:30 pmUSM-SFO
24h 25m2 stops
$882Multiple Airlines
Find Deal
Wed, Mar 25 - Thu, Apr 2
Singapore Airlines Logo
11:30 am - 4:45 pmSFO-USM
39h 15m1 stop
Singapore Airlines Logo
12:05 pm - 9:40 amUSM-SFO
35h 35m1 stop
$886Singapore Airlines
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Sun, Apr 12 - Thu, Apr 30
EVA Air Logo
12:00 pm - 7:10 amSFO-USM
29h 10m2 stops
EVA Air Logo
9:15 am - 4:00 pmUSM-SFO
20h 45m2 stops
$966EVA Air
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Thu, Mar 26 - Thu, Apr 2
EVA Air Logo
12:10 am - 2:55 pmSFO-USM
24h 45m2 stops
EVA Air Logo
9:00 am - 4:00 pmUSM-SFO
21h 00m2 stops
$1,003EVA Air
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Sun, Mar 15 - Thu, Mar 19
China Airlines Logo
11:40 pm - 1:05 pmSFO-USM
23h 25m2 stops
China Airlines Logo
7:55 am - 7:45 pmUSM-SFO
25h 50m2 stops
$1,097China Airlines
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Mon, Mar 16 - Thu, Mar 19
Cathay Pacific Logo
11:25 am - 7:35 pmSFO-USM
41h 10m1 stop
Cathay Pacific Logo
11:40 am - 4:05 pmUSM-SFO
19h 25m1 stop
$1,315Cathay Pacific
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Mon, Jan 5 - Tue, Jan 20
Cathay Pacific Logo
9:45 pm - 7:35 pmSFO-USM
30h 50m1 stop
Cathay Pacific Logo
11:40 am - 4:05 pmUSM-SFO
19h 25m1 stop
$1,325Cathay Pacific
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Tue, Jan 6 - Tue, Jan 20

Singapore Airlines flights from San Francisco to Ko Samui

Our best Singapore Airlines deals on San Francisco to Ko Samui flight tickets
Singapore Airlines
Feb 27
SFO9:40 amSan Francisco
31h 20m
1 stop
USM8:00 amKo Samui
Mar 8
USM8:55 amKo Samui
37h 55m
1 stop
SFO7:50 amSan Francisco
$803
Find similar
Singapore Airlines
Mar 26
SFO10:40 amSan Francisco
42h 10m
1 stop
USM6:50 pmKo Samui
Apr 2
USM12:05 pmKo Samui
35h 35m
1 stop
SFO9:40 amSan Francisco
$863
Find similar
Singapore Airlines
Apr 12
SFO11:30 amSan Francisco
39h 15m
1 stop
USM4:45 pmKo Samui
Apr 30
USM12:05 pmKo Samui
35h 35m
1 stop
SFO9:40 amSan Francisco
$886
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EVA Air flights from San Francisco to Ko Samui

Our best EVA Air deals on San Francisco to Ko Samui flight tickets
EVA Air
Mar 26
SFO12:00 pmSan Francisco
29h 10m
2 stops
USM7:10 amKo Samui
Apr 2
USM9:15 amKo Samui
20h 45m
2 stops
SFO4:00 pmSan Francisco
$966
Find similar
EVA Air
Mar 15
SFO12:10 amSan Francisco
24h 45m
2 stops
USM2:55 pmKo Samui
Mar 19
USM9:00 amKo Samui
21h 00m
2 stops
SFO4:00 pmSan Francisco
$1,003
Find similar
EVA Air
Jan 6
SFO11:30 pmSan Francisco
25h 10m
2 stops
USM3:40 pmKo Samui
Jan 20
USM9:10 pmKo Samui
24h 20m
2 stops
SFO6:30 amSan Francisco
$1,049
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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 November 4, 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

Fri 2/27

9:40 am-8:00 am

1 stop31h 20m

Ko Samui

Sun 3/8

8:55 am-7:50 am

1 stop37h 55m

$803

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Thu 3/26

10:40 am-6:50 pm

1 stop42h 10m

Ko Samui

Thu 4/2

12:05 pm-9:40 am

1 stop35h 35m

$863

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Fri 4/10

12:50 am-2:45 pm

2 stops23h 55m

Ko Samui

Thu 4/30

1:50 pm-8:30 pm

2 stops20h 40m

$881

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Wed 3/25

12:10 am-3:35 pm

2 stops25h 25m

Ko Samui

Thu 4/2

10:05 am-8:30 pm

2 stops24h 25m

$882

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sun 4/12

11:30 am-4:45 pm

1 stop39h 15m

Ko Samui

Thu 4/30

12:05 pm-9:40 am

1 stop35h 35m

$886

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Thu 3/26

12:00 pm-7:10 am

2 stops29h 10m

Ko Samui

Thu 4/2

9:15 am-4:00 pm

2 stops20h 45m

$966

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sun 3/15

12:10 am-2:55 pm

2 stops24h 45m

Ko Samui

Thu 3/19

9:00 am-4:00 pm

2 stops21h 00m

$1,003

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Mon 3/16

11:40 pm-1:05 pm

2 stops23h 25m

Ko Samui

Thu 3/19

7:55 am-7:45 pm

2 stops25h 50m

$1,097

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Mon 1/5

11:25 am-7:35 pm

1 stop41h 10m

Ko Samui

Tue 1/20

11:40 am-4:05 pm

1 stop19h 25m

$1,315

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Tue 1/6

9:45 pm-7:35 pm

1 stop30h 50m

Ko Samui

Tue 1/20

11:40 am-4:05 pm

1 stop19h 25m

$1,325

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 $1,042. 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 $1,081.

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 24% 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

Direct flights

None
There are no direct flights from San Francisco to Ko Samui. There are no popular flight routes from San Francisco to Ko Samui.
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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 25m.

  • 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
1,391 reviews
Search Singapore Airlines flights
EVA AirPriceFrom $1,001Free CancellationRating
8.4
1,270 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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