$416+ 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 4/22. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — USM
Apr 14 — Apr 211
Round-trip
1 adult, Economy
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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
Best
Last-minute
One-way
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 March 15, 2026.
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 March 15, 2026.
This FlightHub deal was found by Cheapflights users on 3/10. 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 11/98:15 pm
SFO
- USM
1 stop20h 45m
Singapore Airlines
Wed 11/188:55 am
USM
- SFO
1 stop24h 40m
Singapore Airlines
Deal found 3/10![Singapore Airlines logo]()
$729
This oojo deal was found by Cheapflights users on 3/13. 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.
Tue 8/1811:45 am
SFO
- USM
1 stop41h 05m
Multiple Airlines
Tue 8/251:30 pm
USM
- SFO
1 stop34h 20m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$854
This Trip.com deal was found by Cheapflights users on 3/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2212:30 am
SFO
- USM
2 stops40h 40m
Multiple Airlines
Sat 9/128:10 am
USM
- SFO
2 stops27h 00m
Multiple Airlines
Deal found 3/12![Multiple Airlines logo]()
$872
This oojo deal was found by Cheapflights users on 3/13. 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.
Sun 9/2011:45 am
SFO
- USM
1 stop39h 35m
Singapore Airlines
Sat 9/268:40 am
USM
- SFO
1 stop39h 10m
Singapore Airlines
Deal found 3/13![Singapore Airlines logo]()
$900
This oojo deal was found by Cheapflights users on 3/12. 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.
Sun 8/2311:45 am
SFO
- USM
1 stop30h 00m
Singapore Airlines
Sat 9/126:15 pm
USM
- SFO
1 stop29h 35m
Singapore Airlines
Deal found 3/12![Singapore Airlines logo]()
$919
This Japan Airlines deal was found by Cheapflights users on 3/13. 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 Japan Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/612:25 pm
SFO
- USM
2 stops30h 10m
Japan Airlines
Wed 9/95:25 pm
USM
- SFO
2 stops30h 40m
Japan Airlines
Deal found 3/13![Japan Airlines logo]()
$926
This FlightHub deal was found by Cheapflights users on 3/11. 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.
Tue 4/2112:50 am
SFO
- USM
2 stops23h 55m
EVA Air
Sun 4/269:00 pm
USM
- SFO
2 stops23h 35m
EVA Air
Deal found 3/11![EVA Air logo]()
$946
This Trip.com deal was found by Cheapflights users on 3/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/31:05 am
SFO
- USM
2 stops29h 45m
Multiple Airlines
Fri 5/157:50 am
USM
- SFO
2 stops26h 05m
Multiple Airlines
Deal found 3/14![Multiple Airlines logo]()
$954
This FlightHub deal was found by Cheapflights users on 3/10. 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.
Sat 4/2512:50 am
SFO
- USM
2 stops22h 55m
EVA Air
Sun 5/108:35 pm
USM
- SFO
2 stops24h 10m
EVA Air
Deal found 3/10![EVA Air logo]()
$984
This FlightHub deal was found by Cheapflights users on 3/14. 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 4/1212:30 pm
SFO
- USM
2 stops29h 15m
Multiple Airlines
Thu 4/309:00 pm
USM
- SFO
2 stops23h 45m
Multiple Airlines
Deal found 3/14![Multiple Airlines logo]()
$1,022
This FlightHub deal was found by Cheapflights users on 3/13. 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 4/612:30 pm
SFO
- USM
2 stops29h 15m
Multiple Airlines
Tue 4/216:55 pm
USM
- SFO
2 stops25h 40m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$1,033
Best flights from San Francisco to Ko SamuiDiscover 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 March 15, 2026.
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 March 15, 2026.
This FlightHub deal was found by Cheapflights users on 3/11. 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.
Tue 4/2112:50 am
SFO
- USM
2 stops23h 55m
EVA Air
Sun 4/269:00 pm
USM
- SFO
2 stops23h 35m
EVA Air
Deal found 3/11![EVA Air logo]()
$946
This FlightHub deal was found by Cheapflights users on 3/12. 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 4/1212:30 pm
SFO
- USM
2 stops29h 00m
Multiple Airlines
Thu 4/309:00 pm
USM
- SFO
2 stops23h 45m
Multiple Airlines
Deal found 3/12![Multiple Airlines logo]()
$1,051
This oojo deal was found by Cheapflights users on 3/12. 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.
Sun 5/311:00 am
SFO
- USM
1 stop41h 50m
Singapore Airlines
Sun 5/318:40 am
USM
- SFO
1 stop39h 10m
Singapore Airlines
Deal found 3/12![Singapore Airlines logo]()
$1,146
This Qatar Airways deal was found by Cheapflights users on 3/10. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/264:00 pm
SFO
- USM
2 stops26h 25m
Qatar Airways
Thu 4/28:50 pm
USM
- SFO
2 stops54h 45m
Qatar Airways
Deal found 3/10![Qatar Airways logo]()
$1,801
This FlightHub deal was found by Cheapflights users on 3/10. 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.
Sat 5/21:15 am
SFO
- USM
2 stops22h 30m
EVA Air
Sun 5/318:50 pm
USM
- SFO
2 stops23h 55m
EVA Air
Deal found 3/10![EVA Air logo]()
$984
This BusinessClass deal was found by Cheapflights users on 3/10. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/212:20 am
SFO
- USM
2 stops22h 25m
Multiple Airlines
Sun 5/3111:55 am
USM
- SFO
1 stop25h 20m
Multiple Airlines
Deal found 3/10![Multiple Airlines logo]()
$1,299
This Malaysia Airlines deal was found by Cheapflights users on 3/11. 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 Malaysia Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/263:55 pm
SFO
- USM
3 stops38h 35m
Multiple Airlines
Sun 5/103:50 pm
USM
- SFO
3 stops35h 45m
Multiple Airlines
Deal found 3/11![Multiple Airlines logo]()
$2,095
Last-minute flights from San Francisco to Ko SamuiDiscover last-minute flight deals from San Francisco to Ko Samui. Data last updated March 15, 2026 and is based on user searches.
Discover last-minute flight deals from San Francisco to Ko Samui. Data last updated March 15, 2026 and is based on user searches.
This BusinessClass deal was found by Cheapflights users on 3/13. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/2411:40 pm
SFO
- USM
2 stops25h 15m
Multiple Airlines
Thu 4/912:15 pm
USM
- SFO
2 stops21h 40m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$2,682
This FlightHub deal was found by Cheapflights users on 3/13. 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 3/249:15 pm
SFO
- USM
1 stop29h 55m
Singapore Airlines
Thu 4/98:40 am
USM
- SFO
1 stop25h 15m
Singapore Airlines
Deal found 3/13![Singapore Airlines logo]()
$2,790
One-way flights from San Francisco to Ko SamuiSearch for one-way flight options from San Francisco to Ko Samui. Find affordable one-way fares based on user searches. Data last updated March 15, 2026.
Search for one-way flight options from San Francisco to Ko Samui. Find affordable one-way fares based on user searches. Data last updated March 15, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/223:30 pm
SFO
- USM
2 stops49h 40m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$416
This oojo deal was found by Cheapflights users on 3/11. 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.
Wed 4/2211:00 am
SFO
- USM
1 stop41h 50m
Singapore Airlines
Deal found 3/11![Singapore Airlines logo]()
$471
This Kiwi.com deal was found by Cheapflights users on 3/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/1511:50 pm
SFO
- USM
2 stops41h 55m
Multiple Airlines
Deal found 3/10![Multiple Airlines logo]()
$546
This Kiwi.com deal was found by Cheapflights users on 3/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/55:15 pm
SFO
- USM
3 stops48h 30m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$644
This Trip.com deal was found by Cheapflights users on 3/13. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/511:45 am
SFO
- USM
1 stop41h 05m
Singapore Airlines
Deal found 3/13![Singapore Airlines logo]()
$777
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 March 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $854 (oojo) |
One-way from | $416 (Kiwi.com) |
Popular in | July |
Cheapest in | April |
Average price | $1,085 |
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 March 15, 2026.
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
Cheapest round-trip
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Tue 4/21
12:50 am-2:45 pm
2 stops23h 55m
Ko Samui
Sun 4/26
9:00 pm-6:35 am
2 stops23h 35m
$946
Quickest round-trip
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Sat 5/2
1:15 am-1:45 pm
2 stops22h 30m
Ko Samui
Sun 5/31
8:50 pm-6:45 am
2 stops23h 55m
$984
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Sun 4/12
12:30 pm-7:30 am
2 stops29h 00m
Ko Samui
Thu 4/30
9:00 pm-6:45 am
2 stops23h 45m
$1,051
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Sun 5/3
11:00 am-6:50 pm
1 stop41h 50m
Ko Samui
Sun 5/31
8:40 am-9:50 am
1 stop39h 10m
$1,146
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Sat 5/2
12:20 am-12:45 pm
2 stops22h 25m
Ko Samui
Sun 5/31
11:55 am-11:15 pm
1 stop25h 20m
$1,299
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Thu 3/26
4:00 pm-8:25 am
2 stops26h 25m
Ko Samui
Thu 4/2
8:50 pm-1:35 pm
2 stops54h 45m
$1,801
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Sun 4/26
3:55 pm-8:30 pm
3 stops38h 35m
Ko Samui
Sun 5/10
3:50 pm-1:35 pm
3 stops35h 45m
$2,095
Cheapest one-way
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Wed 4/22
3:30 pm-7:10 am
2 stops49h 40m
$416
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Wed 4/22
11:00 am-6:50 pm
1 stop41h 50m
$471
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Fri 5/15
11:50 pm-7:45 am
2 stops41h 55m
$546
Showing 1-10 of 14 resultsSorted by cheapest first
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 March.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Francisco-Ko Samui flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.
SFO-USM
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
Prices
Delays
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 March 15, 2026.
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?
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.
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 154 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 Monday 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 10% 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 March 15, 2026.
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
8.1
Comfort
8.3
Crew
8.6
Boarding
8.4
Entertainment
8.0
Overall
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
TPE - SFO
Food
8.1
Comfort
8.3
Crew
8.6
Boarding
8.4
Entertainment
8.0
Overall
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
TPE - SFO
Food
8.1
Comfort
8.3
Crew
8.6
Boarding
8.4
Entertainment
8.0
Overall
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
TPE - SFO
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?
Book flights to Ko Samui if you plan to visit one of these locationsKo Tao
Ko Pha Ngan
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Other flights to Ko Samui
Explore flights to Ko Samui departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on March 15, 2026.
San Francisco and Ko Samui flights
Browse other San Francisco and Ko Samui flight options. Last updated on March 15, 2026.
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Browse through other flights departing from San Francisco. Flights are based on user searches made on Cheapflights and were last updated on March 15, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 March 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$796 | Average$1,075 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$1,001 | Average$1,093 | FlexibilityNo cancel fee | On-time74% |