$530+ 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 2/2. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — USM
Feb 27 — Mar 61
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 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 January 28, 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 January 28, 2026.
This Justfly.com deal was found by Cheapflights users on 1/26. 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 5/711:00 am
SFO
- USM
1 stop30h 45m
Singapore Airlines
Tue 5/127:45 pm
USM
- SFO
1 stop27h 25m
Singapore Airlines
Deal found 1/26![Singapore Airlines logo]()
$759
This FlightHub deal was found by Cheapflights users on 1/27. 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.
Fri 9/1811:45 am
SFO
- USM
1 stop39h 35m
Singapore Airlines
Sun 9/278:40 am
USM
- SFO
1 stop39h 10m
Singapore Airlines
Deal found 1/27![Singapore Airlines logo]()
$780
This Justfly.com deal was found by Cheapflights users on 1/27. 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 4/2611:00 am
SFO
- USM
1 stop41h 50m
Singapore Airlines
Sun 5/108:40 am
USM
- SFO
1 stop38h 30m
Singapore Airlines
Deal found 1/27![Singapore Airlines logo]()
$809
This FlightHub deal was found by Cheapflights users on 1/26. 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 4/2211:00 am
SFO
- USM
1 stop30h 45m
Singapore Airlines
Sun 4/268:40 am
USM
- SFO
1 stop38h 30m
Singapore Airlines
Deal found 1/26![Singapore Airlines logo]()
$836
This FlightHub deal was found by Cheapflights users on 1/27. 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 9/1411:45 am
SFO
- USM
1 stop32h 25m
Singapore Airlines
Tue 9/2211:05 am
USM
- SFO
1 stop36h 45m
Singapore Airlines
Deal found 1/27![Singapore Airlines logo]()
$864
This oojo deal was found by Cheapflights users on 1/27. 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.
Sat 4/1112:50 am
SFO
- USM
2 stops30h 00m
Multiple Airlines
Thu 4/302:35 pm
USM
- SFO
2 stops19h 55m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$876
This oojo deal was found by Cheapflights users on 1/28. 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.
Sat 5/212:50 am
SFO
- USM
2 stops30h 00m
Multiple Airlines
Sun 5/312:00 pm
USM
- SFO
2 stops20h 30m
Multiple Airlines
Deal found 1/28![Multiple Airlines logo]()
$877
This oojo deal was found by Cheapflights users on 1/27. 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.
Thu 9/1712:50 am
SFO
- USM
2 stops30h 00m
Multiple Airlines
Sun 9/272:35 pm
USM
- SFO
2 stops19h 55m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$895
This FlightHub deal was found by Cheapflights users on 1/27. 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 4/1211:00 am
SFO
- USM
1 stop40h 20m
Singapore Airlines
Thu 4/3011:05 am
USM
- SFO
1 stop36h 05m
Singapore Airlines
Deal found 1/27![Singapore Airlines logo]()
$936
This Ovago deal was found by Cheapflights users on 1/26. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/79:40 am
SFO
- USM
1 stop31h 20m
Singapore Airlines
Tue 12/2912:00 pm
USM
- SFO
1 stop34h 50m
Singapore Airlines
Deal found 1/26![Singapore Airlines logo]()
$965
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 January 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $759 (Justfly.com) |
One-way from | $530 (Kiwi.com) |
Popular in | July |
Cheapest in | November |
Average price | $1,291 |
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 January 28, 2026.
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
Sat 4/25
12:50 am-2:45 pm
2 stops23h 55m
Ko Samui
Sun 5/10
9:15 am-8:30 pm
2 stops25h 15m
$876
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Wed 5/6
12:50 am-8:50 pm
2 stops30h 00m
Ko Samui
Tue 5/12
2:35 pm-8:30 pm
2 stops19h 55m
$876
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Sun 4/12
11:00 am-5:20 pm
1 stop40h 20m
Ko Samui
Thu 4/30
11:05 am-9:10 am
1 stop36h 05m
$936
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Sat 5/9
1:15 am-1:45 pm
2 stops22h 30m
Ko Samui
Sun 5/31
6:55 pm-6:45 am
2 stops25h 50m
$975
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Thu 3/26
12:00 pm-7:45 am
2 stops29h 45m
Ko Samui
Thu 4/2
2:00 pm-8:00 pm
2 stops20h 00m
$978
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Wed 2/18
12:00 pm-7:45 am
2 stops28h 45m
Ko Samui
Tue 2/24
5:40 pm-6:30 am
2 stops27h 50m
$994
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Wed 3/18
10:40 am-6:50 pm
1 stop42h 10m
Ko Samui
Sun 3/22
8:55 am-8:50 am
1 stop37h 55m
$1,059
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Mon 2/9
11:40 am-8:00 am
2 stops29h 20m
$553
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Mon 2/9
10:35 am-6:15 pm
1 stop40h 40m
$585
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Mon 2/2
6:39 pm-7:45 am
3 stops46h 06m
$598
Showing 1-10 of 15 results
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 January.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy2 stars | Trust Score*3 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.
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 January 28, 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 13% 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 evening 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 Sunday 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, Delta have had the lowest number of delays on this route, with just 8% 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 January 28, 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.
Comfort
8.3
Crew
8.6
Boarding
8.4
Entertainment
8.0
Food
8.1
Overall
8.4
Reviews
1 / 20
8.0
ExcellentJolene,Jan 2026
SGN - TPE
Comfort
8.3
Crew
8.6
Boarding
8.4
Entertainment
8.0
Food
8.1
Overall
8.4
Reviews
1 / 20
8.0
ExcellentJolene,Jan 2026
SGN - TPE
Comfort
8.3
Crew
8.6
Boarding
8.4
Entertainment
8.0
Food
8.1
Overall
8.4
Reviews
1 / 20
8.0
ExcellentJolene,Jan 2026
SGN - 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?
Book flights to Ko Samui if you plan to visit one of these locationsKo Tao
Ko Pha Ngan
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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 January 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$796 | Average$1,389 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$1,001 | Average$1,093 | FlexibilityNo cancel fee | On-time74% |