How long is the flight from San Francisco to Ko Samui?

For as low as $943, EVA Air can have you in Ko Samui from San Francisco in 24h 05m. The distance from San Francisco to Ko Samui is about 8173 mi. This flight may include one or multiple stops.

What are the cheapest airlines flying from San Francisco to Ko Samui round-trip?

Our cheapest airline available from San Francisco to Ko Samui is Singapore Airlines. Our recent data shows that you can find tickets from as low as $821 on this airline. An additional option worth looking into is EVA Air, starting at $1,001. Singapore Airlines is priced at 34% lower than the current average price of a flight leaving 3 months from now.

In terms of precipitation, rainfall in Ko Samui ranges from 2.3 - 19.3 inches per month. November is typically the wettest month, when rainfall can reach 19.3 in. February is typically the driest time to visit Ko Samui when rainfall is around 2.3 in.

If weather is an important factor for your trip to Ko Samui, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 80.6 F).

Most accurate provider : When it comes to deals on San Francisco-Ko Samui flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San Francisco-Ko Samui flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from San Francisco-Ko Samui flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on San Francisco-Ko Samui flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Francisco-Ko Samui flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from San Francisco to Ko Samui that include hotel bookings?

Yes. In addition to deals on San Francisco to Ko Samui flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from San Francisco to Ko Samui?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Ko Samui.

Can I find deals for business class flights from San Francisco to Ko Samui?

Yes. Cheapflights offers flight deals from San Francisco to Ko Samui by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$470+ Cheap Flights from San Francisco to Ko Samui

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1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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Cheap flight deals from San Francisco to Ko Samui

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$791 (Trip.com)
One-way from	$470 (Gotogate)
Popular in	December
Cheapest in	October
Average price	$1,042

Provider with most accurate pricing for San Francisco-Ko Samui flight deals.

Search Deals

Provider most trusted by Cheapflights users for San Francisco-Ko Samui flights.

Search Deals

From San Francisco to Ko Samui

Search Deals

One-way flight from San Francisco to Ko Samui

Search Deals

Highest demand for flights based on searches. 6% potential increase in price ($81 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($34 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in October 2025

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Find flight deals from San Francisco to Ko Samui

Cheapest flights from San Francisco to Ko Samui
Explore the most affordable flight options available from San Francisco to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 29, 2025.

Wed 11/2611:10 pmSFO - USM

2 stops25h 25mMultiple Airlines

Wed 12/32:05 pmUSM - SFO

2 stops19h 55mMultiple Airlines

Deal found 10/29

$911

Wed 11/269:40 amSFO - USM

1 stop31h 20mSingapore Airlines

Wed 12/37:45 pmUSM - SFO

1 stop27h 05mSingapore Airlines

Deal found 10/29

$923

Tue 11/2511:50 pmSFO - USM

2 stops24h 05mEVA Air

Tue 12/28:20 pmUSM - SFO

2 stops25h 10mEVA Air

Deal found 10/28

$943

Wed 11/269:40 amSFO - USM

1 stop31h 20mSingapore Airlines

Thu 12/47:45 pmUSM - SFO

1 stop27h 05mSingapore Airlines

Deal found 10/26

$971

Fri 11/711:10 pmSFO - USM

2 stops25h 30mMultiple Airlines

Fri 11/141:45 pmUSM - SFO

2 stops20h 15mMultiple Airlines

Deal found 10/28

$974

Tue 11/259:40 amSFO - USM

1 stop31h 20mSingapore Airlines

Tue 12/26:05 pmUSM - SFO

1 stop28h 45mSingapore Airlines

Deal found 10/28

$1,052

Tue 11/2511:50 pmSFO - USM

2 stops24h 05mMultiple Airlines

Tue 12/212:00 pmUSM - SFO

3 stops42h 35mMultiple Airlines

Deal found 10/28

$1,248

Wed 11/269:45 pmSFO - USM

1 stop30h 50mMultiple Airlines

Thu 12/49:00 amUSM - SFO

2 stops22h 20mMultiple Airlines

Deal found 10/26

$1,330

Best flights from San Francisco to Ko Samui
Discover carefully curated flight deals from San Francisco to Ko Samui that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 29, 2025.

Fri 1/1611:10 pmSFO - USM

2 stops25h 25mMultiple Airlines

Tue 2/31:55 pmUSM - SFO

2 stops20h 05mMultiple Airlines

Deal found 10/28

$900

Tue 11/2511:50 pmSFO - USM

2 stops24h 05mEVA Air

Tue 12/28:20 pmUSM - SFO

2 stops25h 10mEVA Air

Deal found 10/28

$943

Wed 11/269:40 amSFO - USM

1 stop31h 20mSingapore Airlines

Thu 12/47:45 pmUSM - SFO

1 stop27h 05mSingapore Airlines

Deal found 10/26

$971

Tue 11/2511:30 pmSFO - USM

2 stops25h 05mMultiple Airlines

Tue 12/29:10 pmUSM - SFO

2 stops24h 20mMultiple Airlines

Deal found 10/28

$943

Sat 1/2411:50 pmSFO - USM

2 stops24h 45mEVA Air

Tue 2/171:55 pmUSM - SFO

2 stops19h 35mEVA Air

Deal found 10/28

$981

Fri 1/169:40 amSFO - USM

1 stop31h 20mSingapore Airlines

Tue 2/37:45 pmUSM - SFO

1 stop27h 05mSingapore Airlines

Deal found 10/28

$1,025

Fri 11/711:10 pmSFO - USM

2 stops25h 30mMultiple Airlines

Fri 11/141:45 pmUSM - SFO

2 stops20h 15mMultiple Airlines

Deal found 10/28

$974

Sun 1/189:40 amSFO - USM

1 stop31h 20mSingapore Airlines

Sun 1/258:55 amUSM - SFO

1 stop37h 55mSingapore Airlines

Deal found 10/27

$1,074

Wed 11/269:45 pmSFO - USM

1 stop30h 50mMultiple Airlines

Thu 12/49:00 amUSM - SFO

2 stops22h 20mMultiple Airlines

Deal found 10/26

$1,330

Last-minute flights from San Francisco to Ko Samui
Discover last-minute flight deals from San Francisco to Ko Samui. Data last updated October 29, 2025 and is based on user searches.

Fri 11/711:10 pmSFO - USM

2 stops25h 30mMultiple Airlines

Fri 11/141:45 pmUSM - SFO

2 stops20h 15mMultiple Airlines

Deal found 10/28

$974

Fri 11/79:40 amSFO - USM

1 stop31h 20mSingapore Airlines

Fri 11/147:45 pmUSM - SFO

1 stop27h 05mSingapore Airlines

Deal found 10/28

$1,898

One-way flights from San Francisco to Ko Samui
Search for one-way flight options from San Francisco to Ko Samui. Find affordable one-way fares based on user searches. Data last updated October 29, 2025.

Mon 11/1711:10 pmSFO - USM

2 stops25h 30mMultiple Airlines

Deal found 10/28

$470

Tue 11/259:40 amSFO - USM

1 stop31h 20mSingapore Airlines

Deal found 10/28

$472

Mon 11/311:10 pmSFO - USM

2 stops25h 25mMultiple Airlines

Deal found 10/29

$474

Tue 11/2511:10 pmSFO - USM

2 stops25h 30mMultiple Airlines

Deal found 10/28

$477

Sat 11/1511:10 pmSFO - USM

2 stops25h 25mMultiple Airlines

Deal found 10/28

$508

Thu 11/63:30 pmSFO - USM

3 stops49h 30mMultiple Airlines

Deal found 10/28

$547

Thu 11/611:50 pmSFO - USM

2 stops24h 50mEVA Air

Deal found 10/28

$553

Sat 11/1512:00 pmSFO - USM

2 stops28h 45mEVA Air

Deal found 10/29

$558

Cheapflights Fare Finder

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 1/16

11:10 pm-3:35 pm

2 stops25h 25m

Ko Samui

Tue 2/3

1:55 pm-7:00 pm

2 stops20h 05m

$900

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Tue 11/25

11:50 pm-2:55 pm

2 stops24h 05m

Ko Samui

Tue 12/2

8:20 pm-6:30 am

2 stops25h 10m

$943

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Tue 11/25

11:30 pm-3:35 pm

2 stops25h 05m

Ko Samui

Tue 12/2

9:10 pm-6:30 am

2 stops24h 20m

$943

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Wed 11/26

9:40 am-8:00 am

1 stop31h 20m

Ko Samui

Thu 12/4

7:45 pm-7:50 am

1 stop27h 05m

$971

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Fri 11/7

11:10 pm-3:40 pm

2 stops25h 30m

Ko Samui

Fri 11/14

1:45 pm-7:00 pm

2 stops20h 15m

$974

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sat 1/24

11:50 pm-3:35 pm

2 stops24h 45m

Ko Samui

Tue 2/17

1:55 pm-6:30 pm

2 stops19h 35m

$981

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Fri 1/16

9:40 am-8:00 am

1 stop31h 20m

Ko Samui

Tue 2/3

7:45 pm-7:50 am

1 stop27h 05m

$1,025

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sun 1/18

9:40 am-8:00 am

1 stop31h 20m

Ko Samui

Sun 1/25

8:55 am-7:50 am

1 stop37h 55m

$1,074

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Wed 11/26

9:45 pm-7:35 pm

1 stop30h 50m

Ko Samui

Thu 12/4

9:00 am-4:20 pm

2 stops22h 20m

$1,330

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Mon 11/3

11:10 pm-3:35 pm

2 stops25h 25m

$474

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 15 results

Compare providers for flights from San Francisco to Ko Samui

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from San Francisco to Ko Samui in October.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy2 stars	Trust Score*3 stars
Ovago	Price Accuracy2 stars	Trust Score*2 stars
Cheapfaremart	Price Accuracy-	Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on San Francisco-Ko Samui flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San Francisco-Ko Samui flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from San Francisco-Ko Samui flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on San Francisco-Ko Samui flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Francisco-Ko Samui flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from San Francisco to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from San Francisco with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from San Francisco to Ko Samui

What is the cheapest month to book a flight from San Francisco to Ko Samui?

Currently, October is the cheapest month in which you can book a flight from San Francisco to Ko Samui (average of $796). Flying from San Francisco to Ko Samui in June is currently the most expensive (average of $1,439). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SFO to USM?

It’s typically best to fly out from San Francisco to Ko Samui at noon. Doing so could potentially save you 28% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from San Francisco to Ko Samui?

Travelers seeking maximum savings on their San Francisco to Ko Samui flight should consider departing on Tuesday at noon when fares are most often at their lowest. Wednesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Ko Samui

Get a feel of what it's like to fly with EVA Air and Singapore Airlines from San Francisco to Ko Samui by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

EVA Air

8.4

Very good

1,264 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Oct 2025

TPE - YYZ

All was well. Despite the flight being delayed a few minutes, passengers were made sure to be informed and updated on the status of the delay.

EVA Air

8.4

Very good

1,264 reviews

EVA Air

8.4

Very good

1,264 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Oct 2025

TPE - YYZ

All was well. Despite the flight being delayed a few minutes, passengers were made sure to be informed and updated on the status of the delay.

Singapore Airlines

8.1

Very good

1,388 reviews

EVA Air

8.4

Very good

1,264 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Oct 2025

TPE - YYZ

All was well. Despite the flight being delayed a few minutes, passengers were made sure to be informed and updated on the status of the delay.

Related info for your journey

How long is the flight from San Francisco to Ko Samui?
For as low as $943, EVA Air can have you in Ko Samui from San Francisco in 24h 05m. The distance from San Francisco to Ko Samui is about 8173 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from San Francisco to Ko Samui round-trip?
Our cheapest airline available from San Francisco to Ko Samui is Singapore Airlines. Our recent data shows that you can find tickets from as low as $821 on this airline. An additional option worth looking into is EVA Air, starting at $1,001. Singapore Airlines is priced at 34% lower than the current average price of a flight leaving 3 months from now.
Can I find deals for flights from San Francisco to Ko Samui that include hotel bookings?
Yes. In addition to deals on San Francisco to Ko Samui flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from San Francisco to Ko Samui?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Ko Samui.
Can I find deals for business class flights from San Francisco to Ko Samui?
Yes. Cheapflights offers flight deals from San Francisco to Ko Samui by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from San Francisco to Ko Samui?
Currently, October is the cheapest month in which you can book a flight from San Francisco to Ko Samui (average of $796). Flying from San Francisco to Ko Samui in June is currently the most expensive (average of $1,439). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Ko Tao

Ko Pha Ngan

Browse thousands of different options on Cheapflights for your next trip

Top 2 airlines flying from San Francisco to Ko Samui

Airline	Cheapest	Average	Flexibility	On-time
Singapore Airlines	Cheapest$821	Average$1,134	FlexibilityNo cancel fee	On-time81%
EVA Air	Cheapest$1,001	Average$1,109	FlexibilityNo cancel fee	On-time74%

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$470+ Cheap flights from San Francisco (SFO) to Ko Samui (USM)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/17. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from San Francisco to Ko Samui with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from San Francisco to Ko Samui

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from San Francisco to Ko Samui

Cheapest flights from San Francisco to Ko SamuiExplore the most affordable flight options available from San Francisco to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 29, 2025.

Explore the most affordable flight options available from San Francisco to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 29, 2025.

Cheapflights Fare Finder

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

Compare providers for flights from San Francisco to Ko Samui

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from San Francisco to Ko Samui in October.

Best time to book a flight from San Francisco to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from San Francisco with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from San Francisco to Ko Samui

What is the cheapest month to book a flight from San Francisco to Ko Samui?

What is the cheapest time of day to fly from SFO to USM?

What is the cheapest day to fly from San Francisco to Ko Samui?

Reviews of airlines servicing Ko Samui

Get a feel of what it's like to fly with EVA Air and Singapore Airlines from San Francisco to Ko Samui by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Ko Samui. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

How long is the flight from San Francisco to Ko Samui?

What are the cheapest airlines flying from San Francisco to Ko Samui round-trip?

Can I find deals for flights from San Francisco to Ko Samui that include hotel bookings?

How can I find direct flights from San Francisco to Ko Samui?

Can I find deals for business class flights from San Francisco to Ko Samui?

What is the cheapest month to book a flight from San Francisco to Ko Samui?

Traveling to a place near Ko Samui?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for San Francisco to Ko Samui

See prices for flight routes from nearby airports that may be better suited for you.

Top 2 airlines flying from San Francisco to Ko Samui

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Cheapest flights from San Francisco to Ko Samui
Explore the most affordable flight options available from San Francisco to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 29, 2025.