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 at night 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 18% of their flights experiencing any sort of delay.

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

Historically, on average around 21% 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 159 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 September 2026, 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.

$456 Cheap Flights from San Francisco to Ko Samui in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from San Francisco to Ko Samui

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

10:55 pm - 7:50 pmSFO San Francisco-USM Ko Samui

29h 55m2 stops Hong Kong Intl Bangkok Suvarnabhumi

3:35 pm - 9:15 pmUSM Ko Samui-SFO San Francisco

20h 40m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$817Multiple Airlines

Thu, Mar 4 - Sat, Mar 13

10:55 pm - 2:55 pmSFO San Francisco-USM Ko Samui

25h 00m2 stops Hong Kong Intl Bangkok Suvarnabhumi

3:35 pm - 9:15 pmUSM Ko Samui-SFO San Francisco

20h 40m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$825Multiple Airlines

Mon, Mar 1 - Sun, Mar 7

10:55 pm - 7:50 pmSFO San Francisco-USM Ko Samui

29h 55m2 stops Hong Kong Intl Bangkok Suvarnabhumi

3:35 pm - 9:15 pmUSM Ko Samui-SFO San Francisco

20h 40m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$831Multiple Airlines

Thu, Mar 4 - Sat, Mar 13

10:55 pm - 2:55 pmSFO San Francisco-USM Ko Samui

25h 00m2 stops Hong Kong Intl Bangkok Suvarnabhumi

1:45 pm - 9:15 pmUSM Ko Samui-SFO San Francisco

22h 30m2 stops Bangkok Suvarnabhumi Hong Kong Intl

$845Multiple Airlines

Wed, Jan 27 - Mon, Feb 22

9:40 am - 5:10 pmSFO San Francisco-USM Ko Samui

40h 30m1 stop Singapore Changi

12:00 pm - 7:50 amUSM Ko Samui-SFO San Francisco

34h 50m1 stop Singapore Changi

$875Singapore Airlines

Tue, Nov 3 - Wed, Nov 25

9:40 am - 5:10 pmSFO San Francisco-USM Ko Samui

40h 30m1 stop Singapore Changi

8:55 am - 7:50 amUSM Ko Samui-SFO San Francisco

37h 55m1 stop Singapore Changi

$921Singapore Airlines

Fri, Mar 5 - Sat, Mar 13

9:40 am - 8:00 amSFO San Francisco-USM Ko Samui

31h 20m1 stop Singapore Changi

1:25 pm - 7:50 amUSM Ko Samui-SFO San Francisco

33h 25m1 stop Singapore Changi

$960Singapore Airlines

Wed, Jan 27 - Mon, Feb 22

11:50 pm - 3:35 pmSFO San Francisco-USM Ko Samui

24h 45m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

2:05 pm - 6:40 pmUSM Ko Samui-SFO San Francisco

19h 35m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl

$1,079EVA Air

Tue, Nov 3 - Thu, Nov 26

11:50 pm - 3:35 pmSFO San Francisco-USM Ko Samui

24h 45m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

2:05 pm - 6:40 pmUSM Ko Samui-SFO San Francisco

19h 35m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl

$1,079EVA Air

Mon, Nov 2 - Thu, Nov 26

11:50 pm - 3:35 pmSFO San Francisco-USM Ko Samui

24h 45m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi

2:05 pm - 6:40 pmUSM Ko Samui-SFO San Francisco

19h 35m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl

$1,079EVA Air

Mon, Nov 2 - Wed, Nov 25

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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

Mar 5

SFO9:40 amSan Francisco

40h 30m

1 stop

USM5:10 pmKo Samui

Mar 13

USM8:55 amKo Samui

37h 55m

1 stop

SFO7:50 amSan Francisco

$921

Singapore Airlines

Nov 3

SFO9:40 amSan Francisco

40h 30m

1 stop

USM5:10 pmKo Samui

Nov 13

USM6:05 pmKo Samui

28h 45m

1 stop

SFO7:50 amSan Francisco

$956

Singapore Airlines

Jan 27

SFO9:40 amSan Francisco

31h 20m

1 stop

USM8:00 amKo Samui

Feb 22

USM1:25 pmKo Samui

33h 25m

1 stop

SFO7:50 amSan Francisco

$960

EVA Air flights from San Francisco to Ko Samui

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

EVA Air

Nov 18

SFO12:00 pmSan Francisco

28h 10m

2 stops

USM7:10 amKo Samui

Dec 2

USM9:20 amKo Samui

24h 20m

2 stops

SFO6:40 pmSan Francisco

$1,079

EVA Air

Nov 22

SFO11:50 pmSan Francisco

24h 30m

2 stops

USM3:20 pmKo Samui

Nov 30

USM5:05 pmKo Samui

28h 35m

2 stops

SFO6:40 amSan Francisco

$1,117

EVA Air

Nov 22

SFO11:50 pmSan Francisco

25h 25m

2 stops

USM4:15 pmKo Samui

Nov 30

USM9:10 pmKo Samui

24h 30m

2 stops

SFO6:40 amSan Francisco

$1,125

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Thu 3/4

10:55 pm-7:50 pm

2 stops29h 55m

Ko Samui

Sat 3/13

3:35 pm-9:15 pm

2 stops20h 40m

$817

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Mon 3/1

10:55 pm-2:55 pm

2 stops25h 00m

Ko Samui

Sun 3/7

3:35 pm-9:15 pm

2 stops20h 40m

$825

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Thu 3/4

10:55 pm-7:50 pm

2 stops29h 55m

Ko Samui

Sat 3/13

3:35 pm-9:15 pm

2 stops20h 40m

$831

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Wed 1/27

10:55 pm-2:55 pm

2 stops25h 00m

Ko Samui

Mon 2/22

1:45 pm-9:15 pm

2 stops22h 30m

$845

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Tue 11/3

9:40 am-5:10 pm

1 stop40h 30m

Ko Samui

Wed 11/25

12:00 pm-7:50 am

1 stop34h 50m

$875

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Fri 3/5

9:40 am-5:10 pm

1 stop40h 30m

Ko Samui

Sat 3/13

8:55 am-7:50 am

1 stop37h 55m

$921

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Wed 1/27

9:40 am-8:00 am

1 stop31h 20m

Ko Samui

Mon 2/22

1:25 pm-7:50 am

1 stop33h 25m

$960

Quickest round-trip

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Tue 11/3

11:50 pm-3:35 pm

2 stops24h 45m

Ko Samui

Thu 11/26

2:05 pm-6:40 pm

2 stops19h 35m

$1,079

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Mon 11/2

11:50 pm-3:35 pm

2 stops24h 45m

Ko Samui

Thu 11/26

2:05 pm-6:40 pm

2 stops19h 35m

$1,079

San FranciscoKo Samui

SFO San Francisco - USM Ko Samui

SFOUSM

San Francisco

Mon 11/2

11:50 pm-3:35 pm

2 stops24h 45m

Ko Samui

Wed 11/25

2:05 pm-6:40 pm

2 stops19h 35m

$1,079

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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 typical price of a round-trip flight between San Francisco and Ko Samui?

Prices are currently low for flights on this route.

Typical prices usually range from $877 to $1,098.
The lowest price recently found on this route was $817.

What is the cheapest month to fly to Ko Samui?

In general, December 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 $0. If you don’t want to visit Ko Samui in December, then you should wait until August to fly from San Francisco, when ticket prices are also cheap, with an average price of $0.

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

Best Price Found	$456
Fastest flight time	24h 30m
Direct flights	None

The best one-way flight to Ko Samui from San Francisco in the past 72 hours is $456. The best round-trip flight deal from San Francisco to Ko Samui found on momondo in the last 72 hours is $817.

The fastest flight from San Francisco to Ko Samui takes 24h 30m

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 24h 30m.
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 September 2026, 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 (58% of total bookings). The next most popular airline is EVA Air (42%).

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 8.2 1,600 reviews		Search Singapore Airlines flights
EVA Air	PriceFrom $940	Free Cancellation	Rating 8.5 1,524 reviews		Search EVA Air flights

Ko Tao

Ko Pha Ngan

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.

An easier way to manage your Ko Samui trip

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Cheap flights from San Francisco to Ko Samui from $456

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.

Find the cheapest flights from San Francisco to Ko Samui

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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

EVA Air flights from San Francisco to Ko Samui

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

momondo Fare Finder

Use the filters below to find and compare flights from San Francisco to Ko Samui that are best for you.

See travel insights to Ko Samui from

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

What is the typical price of a round-trip flight between San Francisco and Ko Samui?

What is the cheapest month to fly to Ko Samui?

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

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

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

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

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

When to book flights from San Francisco to Ko Samui

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

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying 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?

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

Fly your favorite airline to Ko Samui

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Ko Samui

List of cabin classes available on flights landing in Ko Samui. Availability may vary depending on flight origin and airline.

Popular cities in Thailand

Popular flights according to clicks in the last 7 days on momondo

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According to popular flight searches on momondo this year

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