What day of the week experiences the fewest flight delays on this route?

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

What is the most punctual flight time for San Francisco to Ko Samui flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

Which airline has the best punctuality record on San Francisco to Ko Samui flights?

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 9% of their flights experiencing any sort of delay.

How often are flights from San Francisco to Ko Samui delayed?

Historically, on average around 15% of flights between San Francisco and Ko Samui have experienced a delay on any given week. The average delay length over the past 12 months has been 153 minutes.

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?

As of December 2025, there are 2 operators available to choose from 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.

$155 Cheap Flights from San Francisco to Ko Samui in 2025/26

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Find the cheapest flights from San Francisco to Ko Samui

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

11:30 am - 6:50 pm

SFO

USM

41h 20m1 stop

8:45 am - 9:40 am

USM

SFO

38h 55m1 stop

$868Singapore Airlines

Sun, Apr 26 - Sun, May 10

11:30 am - 6:50 pm

SFO

USM

41h 20m1 stop

8:45 am - 9:40 am

USM

SFO

38h 55m1 stop

$877Singapore Airlines

Thu, Apr 16 - Sun, Apr 26

12:25 am - 1:45 pm

SFO

USM

23h 20m2 stops

8:35 pm - 6:45 am

USM

SFO

24h 10m2 stops

$936EVA Air

Wed, Apr 15 - Sun, Apr 26

11:30 am - 7:50 am

SFO

USM

30h 20m1 stop

8:45 am - 9:40 am

USM

SFO

38h 55m1 stop

$953Singapore Airlines

Sun, May 3 - Sun, May 31

12:50 am - 1:45 pm

SFO

USM

22h 55m2 stops

8:50 pm - 6:45 am

USM

SFO

23h 55m2 stops

$973EVA Air

Sat, Apr 25 - Sun, May 10

11:50 pm - 3:35 pm

SFO

USM

24h 45m2 stops

2:05 pm - 7:40 pm

USM

SFO

19h 35m2 stops

$974EVA Air

Tue, Mar 3 - Sat, Mar 14

12:00 pm - 7:45 am

SFO

USM

29h 45m2 stops

8:10 am - 4:00 pm

USM

SFO

21h 50m2 stops

$977EVA Air

Thu, Mar 26 - Thu, Apr 2

11:50 pm - 5:50 pm

SFO

USM

27h 00m2 stops

2:05 pm - 6:30 pm

USM

SFO

19h 25m2 stops

$992EVA Air

Mon, Jan 19 - Wed, Feb 4

12:30 pm - 7:10 am

SFO

USM

28h 40m2 stops

8:10 am - 4:00 pm

USM

SFO

21h 50m2 stops

$1,002Multiple Airlines

Sun, Apr 12 - Thu, Apr 30

12:30 pm - 7:35 am

SFO

USM

29h 05m2 stops

7:50 am - 4:00 pm

USM

SFO

22h 10m2 stops

$1,003Multiple Airlines

Sun, Apr 12 - Thu, Apr 30

EVA Air flights from San Francisco to Ko Samui

Our best EVA Air deals on San Francisco to Ko Samui flight tickets

EVA Air

Apr 15

SFO12:25 amSan Francisco

23h 20m

2 stops

USM1:45 pmKo Samui

Apr 26

USM8:35 pmKo Samui

24h 10m

2 stops

SFO6:45 amSan Francisco

$936

Find similar

EVA Air

Apr 25

SFO12:50 amSan Francisco

22h 55m

2 stops

USM1:45 pmKo Samui

May 10

USM8:50 pmKo Samui

23h 55m

2 stops

SFO6:45 amSan Francisco

$973

Find similar

EVA Air

Mar 3

SFO11:50 pmSan Francisco

24h 45m

2 stops

USM3:35 pmKo Samui

Mar 14

USM2:05 pmKo Samui

19h 35m

2 stops

SFO7:40 pmSan Francisco

$974

Find similar

Singapore Airlines flights from San Francisco to Ko Samui

Our best Singapore Airlines deals on San Francisco to Ko Samui flight tickets

Singapore Airlines

Apr 26

SFO11:30 amSan Francisco

41h 20m

1 stop

USM6:50 pmKo Samui

May 10

USM8:45 amKo Samui

38h 55m

1 stop

SFO9:40 amSan Francisco

$868

Find similar

Singapore Airlines

Apr 16

SFO11:30 amSan Francisco

41h 20m

1 stop

USM6:50 pmKo Samui

Apr 26

USM8:45 amKo Samui

38h 55m

1 stop

SFO9:40 amSan Francisco

$877

Find similar

Singapore Airlines

May 3

SFO11:30 amSan Francisco

30h 20m

1 stop

USM7:50 amKo Samui

May 31

USM8:45 amKo Samui

38h 55m

1 stop

SFO9:40 amSan Francisco

$953

Find similar

Fly from

Fly to

Route

Depart

Return

Price

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sun 4/26

11:30 am-6:50 pm

1 stop41h 20m

Ko Samui

Sun 5/10

8:45 am-9:40 am

1 stop38h 55m

$868

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Thu 4/16

11:30 am-6:50 pm

1 stop41h 20m

Ko Samui

Sun 4/26

8:45 am-9:40 am

1 stop38h 55m

$877

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Wed 4/15

12:25 am-1:45 pm

2 stops23h 20m

Ko Samui

Sun 4/26

8:35 pm-6:45 am

2 stops24h 10m

$936

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sun 5/3

11:30 am-7:50 am

1 stop30h 20m

Ko Samui

Sun 5/31

8:45 am-9:40 am

1 stop38h 55m

$953

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sat 4/25

12:50 am-1:45 pm

2 stops22h 55m

Ko Samui

Sun 5/10

8:50 pm-6:45 am

2 stops23h 55m

$973

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Tue 3/3

11:50 pm-3:35 pm

2 stops24h 45m

Ko Samui

Sat 3/14

2:05 pm-7:40 pm

2 stops19h 35m

$974

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Thu 3/26

12:00 pm-7:45 am

2 stops29h 45m

Ko Samui

Thu 4/2

8:10 am-4:00 pm

2 stops21h 50m

$977

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Mon 1/19

11:50 pm-5:50 pm

2 stops27h 00m

Ko Samui

Wed 2/4

2:05 pm-6:30 pm

2 stops19h 25m

$992

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sun 4/12

12:30 pm-7:10 am

2 stops28h 40m

Ko Samui

Thu 4/30

8:10 am-4:00 pm

2 stops21h 50m

$1,002

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sun 4/12

12:30 pm-7:35 am

2 stops29h 05m

Ko Samui

Thu 4/30

7:50 am-4:00 pm

2 stops22h 10m

$1,003

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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

Prices

Delays

What is the cheapest month to fly to Ko Samui?

In general, November 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 $859. If you don’t want to visit Ko Samui in November, then you should wait until January to fly from San Francisco, when ticket prices are also cheap, with an average price of $987.

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 37% 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	24h 45m
Direct flights	None

The fastest flight from San Francisco to Ko Samui takes 24h 45m

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

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 24h 45m.
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?
As of December 2025, there are 2 operators available to choose from 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?
Based on momondo bookings for this flight route, the most popular airline on flight routes from San Francisco to Ko Samui is Singapore Airlines (60% of total bookings). The next most popular airline is EVA Air (40%).

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 Airlines	PriceFrom $817	Free Cancellation	Rating 8.1 1,413 reviews		Search Singapore Airlines flights
EVA Air	PriceFrom $1,001	Free Cancellation	Rating 8.5 1,297 reviews		Search EVA Air flights

Ko Tao

Ko Pha Ngan

Khanom

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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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Cheap flights from San Francisco to Ko Samui from $426

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 1/19. 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

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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

Singapore Airlines flights from San Francisco to Ko Samui

Our best Singapore Airlines deals on San Francisco to Ko Samui flight tickets

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How to get the cheapest flight ticket from San Francisco to Ko Samui

What is the cheapest month to fly to Ko Samui?

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

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

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

You could potentially save up to 37% on your flight if you consider stops on a San Francisco to Ko Samui flight.

How often are flights from San Francisco to Ko Samui delayed?

Historically, on average around 15% of flights between San Francisco and Ko Samui have experienced a delay on any given week. The average delay length over the past 12 months has been 153 minutes.

What is the most punctual flight time for San Francisco to Ko Samui flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on San Francisco to Ko Samui flights?

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 9% of their flights experiencing any sort of delay.

When to book flights from San Francisco to Ko Samui

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

Direct flights

How far is San Francisco to Ko Samui by plane?

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

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?

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

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

Traveling to a place near Ko Samui?

Why use momondo?

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

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

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

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

An easier way to manage your Ko Samui trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Thailand

Airports servicing Thailand