HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ko Samui

$487+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — USM
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from San Francisco to Ko Samui with Cheapflights

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

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from San Francisco to Ko Samui

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to Ko Samui (USM). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 11, 2025.

Round-trip from

$760
(FlightHub)

One-way from

$516
(FlightHub)

Popular in

December

Cheapest in

October

Average price

$1,101
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. 11% potential increase in price ($159 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($58 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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 September 11, 2025.

This FlightHub deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2211:30 amSFO - USM
1 stop33h 40mSingapore Airlines
Tue 11/116:05 pmUSM - SFO
1 stop28h 45mSingapore Airlines
Deal found 9/10$760
This FlightHub deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/99:40 amSFO - USM
1 stop31h 20mSingapore Airlines
Sun 11/2312:00 pmUSM - SFO
1 stop34h 50mSingapore Airlines
Deal found 9/10$788
This Justfly.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/99:40 amSFO - USM
1 stop31h 20mSingapore Airlines
Fri 11/147:45 pmUSM - SFO
1 stop27h 05mSingapore Airlines
Deal found 9/9$895
This Justfly.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/110:40 amSFO - USM
1 stop31h 20mSingapore Airlines
Wed 11/512:00 pmUSM - SFO
1 stop34h 50mSingapore Airlines
Deal found 9/11$921
This FlightHub deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/211:10 amSFO - USM
2 stops29h 20mEVA Air
Tue 11/119:35 amUSM - SFO
2 stops20h 25mEVA Air
Deal found 9/10$943
This FlightHub deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2012:00 pmSFO - USM
2 stops28h 10mMultiple Airlines
Wed 11/261:45 pmUSM - SFO
2 stops19h 55mMultiple Airlines
Deal found 9/10$944
This Justfly.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/911:30 amSFO - USM
1 stop30h 20mSingapore Airlines
Fri 10/175:40 pmUSM - SFO
1 stop30h 00mSingapore Airlines
Deal found 9/11$951
This FlightHub deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/191:10 amSFO - USM
2 stops23h 35mEVA Air
Mon 12/110:00 amUSM - SFO
2 stops19h 50mEVA Air
Deal found 9/10$972
This FlightHub deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/912:30 pmSFO - USM
2 stops29h 05mMultiple Airlines
Fri 10/178:45 amUSM - SFO
2 stops21h 15mMultiple Airlines
Deal found 9/11$982
This Gurufare deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/201:10 amSFO - USM
2 stops23h 35mEVA Air
Mon 12/19:10 pmUSM - SFO
2 stops24h 20mEVA Air
Deal found 9/10$984
This EVA Air deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure EVA Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/171:25 amSFO - USM
2 stops23h 20mEVA Air
Mon 9/2210:05 amUSM - SFO
2 stops23h 55mEVA Air
Deal found 9/10$1,003
This FlightHub deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2011:30 amSFO - USM
1 stop30h 20mSingapore Airlines
Mon 12/112:00 pmUSM - SFO
1 stop34h 50mSingapore Airlines
Deal found 9/10$1,008

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from San Francisco to Ko Samui that are best for you.

Fly from

San Francisco

Fly to

Ko Samui

Route

Depart

Return

Price

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

6:05 pm-7:50 am

1 stop28h 45m

$760

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sun 11/9

9:40 am-8:00 am

1 stop31h 20m

Ko Samui

Sun 11/23

12:00 pm-7:50 am

1 stop34h 50m

$788

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Tue 10/21

12:45 am-8:50 pm

2 stops30h 05m

Ko Samui

Tue 11/11

1:45 pm-6:40 pm

2 stops19h 55m

$943

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sun 11/9

11:50 pm-2:55 pm

2 stops24h 05m

Ko Samui

Sun 11/23

9:10 pm-6:40 am

2 stops24h 30m

$982

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sun 10/19

1:10 am-2:45 pm

2 stops23h 35m

Ko Samui

Thu 11/27

8:30 am-3:00 pm

2 stops21h 30m

$1,003

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sun 10/19

1:10 am-3:45 pm

2 stops24h 35m

Ko Samui

Wed 12/3

1:35 pm-6:30 pm

2 stops19h 55m

$1,003

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Wed 9/17

1:25 am-3:10 pm

2 stops23h 45m

Ko Samui

Mon 9/22

9:15 am-4:00 pm

2 stops20h 45m

$1,003

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Fri 10/17

1:10 am-1:45 pm

2 stops22h 35m

Ko Samui

Sat 10/25

11:45 am-8:00 pm

2 stops22h 15m

$1,019

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sun 9/14

12:00 pm-7:50 am

1 stop29h 50m

Ko Samui

Sat 9/20

7:25 pm-9:40 am

1 stop28h 15m

$1,027

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Mon 9/15

2:45 pm-8:25 pm

3 stops39h 40m

$487

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/8

Showing 1-10 of 15 results
1
2

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 time of day to fly from SFO to USM?

Find hourly flight availability from San Francisco to Ko Samui. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

It’s typically best to fly out from San Francisco to Ko Samui at noon. Doing so could potentially save you 29% 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?

Use this chart to determine the cheapest time to fly round-trip from San Francisco to Ko Samui. Price data was last updated on March 30, 2025.

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 insights into the airlines that provide service to Ko Samui. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ko Samui. Reviews last updated September 11, 2025.
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
1,236 reviews

Entertainment

8.0

Food

8.1

Overall

8.4

Comfort

8.3

Boarding

8.4

Crew

8.6

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak
EVA Air
8.4
Very good
1,236 reviews
EVA Air
8.4
Very good
1,236 reviews

Entertainment

8.0

Food

8.1

Overall

8.4

Comfort

8.3

Boarding

8.4

Crew

8.6

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak
Singapore Airlines
8.1
Very good
1,365 reviews
EVA Air
8.4
Very good
1,236 reviews

Entertainment

8.0

Food

8.1

Overall

8.4

Comfort

8.3

Boarding

8.4

Crew

8.6

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak

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?

    For as low as $943, Singapore Airlines can have you in Ko Samui from San Francisco in 30h 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 $1,048. Singapore Airlines is priced at 35% 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.

See more FAQs

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Tao
Ko Pha Ngan

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.
Los Angeles to Suvarnabhumi flights
San Francisco to Suvarnabhumi flights
Ontario to Suvarnabhumi flights
Los Angeles to Don Mueang Intl flights
Burbank to Suvarnabhumi flights
Santa Ana to Suvarnabhumi flights
San Jose to Suvarnabhumi flights
Oakland to Suvarnabhumi flights
San Francisco to Don Mueang Intl flights
Las Vegas to Suvarnabhumi flights
San Diego to Suvarnabhumi flights
Los Angeles to Phuket City flights
San Francisco to Phuket City flights
Sacramento to Suvarnabhumi flights
San Francisco to Chiang Mai flights
Ontario to Phuket City flights
Reno to Suvarnabhumi flights
Burbank to Phuket City flights
Long Beach to Suvarnabhumi flights
Los Angeles to Chiang Mai flights
Medford to Suvarnabhumi flights
Santa Rosa to Suvarnabhumi flights
San Jose to Phuket City flights
Santa Ana to Phuket City flights
Oakland to Phuket City flights
Fresno to Suvarnabhumi flights
Ontario to Chiang Mai flights
San Diego to Don Mueang Intl flights
Las Vegas to Phuket City flights
Palm Springs to Suvarnabhumi flights
San Jose to Chiang Mai flights
Los Angeles to Ko Samui flights
Oakland to Chiang Mai flights
Los Angeles to Krabi flights
San Francisco to Krabi flights
Ontario to Don Mueang Intl flights
Burbank to Chiang Mai flights
Santa Ana to Chiang Mai flights
San Diego to Phuket City flights
Arcata to Suvarnabhumi flights
Ontario to Krabi flights
San Diego to Chiang Mai flights
Sacramento to Phuket City flights
Santa Ana to Krabi flights
Las Vegas to Chiang Mai flights
Long Beach to Phuket City flights
Las Vegas to Don Mueang Intl flights

Top 2 airlines flying from San Francisco to Ko Samui

Discover the top 2 airlines that operate flights from San Francisco to Ko Samui. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Singapore AirlinesCheapest$821Average$1,172FlexibilityNo cancel feeOn-time81%
EVA AirCheapest$1,048Average$1,129FlexibilityNo cancel feeOn-time74%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.