$448+ 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 3/17. 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
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
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 December 12, 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 December 12, 2025.
This Justfly.com deal was found by Cheapflights users on 12/10. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This FlightHub deal was found by Cheapflights users on 12/10. 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.
This Gurufare deal was found by Cheapflights users on 12/10. 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.
This oojo deal was found by Cheapflights users on 12/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This oojo deal was found by Cheapflights users on 12/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This CheapOair deal was found by Cheapflights users on 12/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This oojo deal was found by Cheapflights users on 12/11. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This AranGrant deal was found by Cheapflights users on 12/11. 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 AranGrant is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Find 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 December 12, 2025.
Most accurate provider | eDreams 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $868 (Justfly.com) |
One-way from | $448 (Kiwi.com) |
Popular in | December |
Cheapest in | November |
Average price | $2,044 |
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
Sun 5/10
11:30 am-7:50 am
1 stop30h 20m
Ko Samui
Sun 5/31
8:45 am-9:40 am
1 stop38h 55m
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Sun 5/3
11:30 am-5:20 pm
1 stop39h 50m
Ko Samui
Sun 5/31
8:45 am-9:40 am
1 stop38h 55m
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Sat 5/9
12:50 am-2:45 pm
2 stops23h 55m
Ko Samui
Sun 5/31
8:50 pm-6:45 am
2 stops23h 55m
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
1:55 pm-7:40 pm
2 stops19h 45m
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Sun 4/12
11:30 am-5:20 pm
1 stop39h 50m
Ko Samui
Thu 4/30
11:05 am-9:40 am
1 stop36h 35m
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Mon 1/19
11:50 pm-5:40 pm
2 stops26h 50m
Ko Samui
Thu 2/5
8:30 am-2:50 pm
2 stops21h 20m
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
1:35 pm-6:30 pm
2 stops19h 55m
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Mon 1/19
11:50 pm-5:40 pm
2 stops26h 50m
Ko Samui
Sun 2/8
8:30 pm-6:30 am
2 stops25h 00m
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Tue 3/17
8:09 pm-7:10 am
3 stops45h 01m
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Thu 3/19
3:25 pm-7:10 am
3 stops49h 45m
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 December.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars |
- 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.
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 December is currently the most expensive (average of $2,044). 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.
How often are flights from San Francisco to Ko Samui delayed?
About 15% of weekly flights between San Francisco and Ko Samui have experienced delays in the past year, with the average delay time being 153 minutes.
What is the most punctual flight time for San Francisco to Ko Samui flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on San Francisco to Ko Samui flights?
Over the last year, United Airlines have had the lowest number of delays on this route, with just 9% of flights being delayed.
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 December 12, 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.
Food
Boarding
Comfort
Overall
Entertainment
Crew
Reviews
Walter,Nov 2025
LAX - TPE
Food
Boarding
Comfort
Overall
Entertainment
Crew
Reviews
Walter,Nov 2025
LAX - TPE
Food
Boarding
Comfort
Overall
Entertainment
Crew
Reviews
Walter,Nov 2025
LAX - TPE
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.
Traveling to a place near Ko Samui?
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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
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 December 12, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$817 | Average$1,084 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$1,001 | Average$1,102 | FlexibilityNo cancel fee | On-time74% |