$654+ 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 6/30. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — USM
May 5 — May 121
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
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 April 30, 2025.
Most accurate provider | AranGrant 3 stars |
|---|---|
Most trusted provider | AranGrant 3 stars |
Round-trip from | $1,447 (SmartFares) |
Popular in | December |
Cheapest in | October |
Average price | $1,138 |
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 April 30, 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 April 30, 2025.
This FlightHub deal was found by Cheapflights users on 4/29. 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 9/1511:30 amSFO - USM
1 stop30h 20mSingapore Airlines
Wed 10/85:50 pmUSM - SFO
1 stop29h 50mSingapore Airlines
Deal found 4/29![Singapore Airlines logo]()
$807
This Trip.com deal was found by Cheapflights users on 4/29. 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.
Mon 9/1511:30 amSFO - USM
2 stops37h 40mMultiple Airlines
Wed 10/87:00 amUSM - SFO
2 stops40h 40mMultiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$946
This FlightHub deal was found by Cheapflights users on 4/29. 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 9/151:25 amSFO - USM
2 stops22h 20mEVA Air
Wed 10/89:15 amUSM - SFO
2 stops20h 45mEVA Air
Deal found 4/29![EVA Air logo]()
$1,007
This FlightHub deal was found by Cheapflights users on 4/29. 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 9/141:05 amSFO - USM
2 stops21h 40mChina Airlines
Tue 10/78:00 amUSM - SFO
2 stops25h 55mChina Airlines
Deal found 4/29![China Airlines logo]()
$1,128
This Gurufare deal was found by Cheapflights users on 4/29. 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.
Sun 9/141:05 amSFO - USM
1 stop27h 30mCathay Pacific
Wed 10/87:00 amUSM - SFO
2 stops24h 30mCathay Pacific
Deal found 4/29![Cathay Pacific logo]()
$1,395
This Air France deal was found by Cheapflights users on 4/29. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/183:05 pmSFO - USM
2 stops31h 40mAir France
Sat 10/114:25 pmUSM - SFO
2 stops34h 25mAir France
Deal found 4/29![Air France logo]()
$2,003
This Emirates deal was found by Cheapflights users on 4/29. 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 Emirates is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/135:05 pmSFO - USM
2 stops33h 50mEmirates
Fri 6/208:00 amUSM - SFO
2 stops44h 00mEmirates
Deal found 4/29![Emirates logo]()
$2,902
This business-class.com deal was found by Cheapflights users on 4/30. 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 business-class.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/611:48 amSFO - USM
3 stops40h 42mJapan Airlines
Thu 10/167:30 pmUSM - SFO
3 stops37h 37mJapan Airlines
Deal found 4/30![Japan Airlines logo]()
$3,903
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 April 30, 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
Thu 7/3
1:00 pm-7:35 am
2 stops28h 35m
Ko Samui
Fri 7/11
11:45 am-8:35 pm
2 stops22h 50m
$1,447
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Thu 7/3
12:50 am-8:15 am
2 stops41h 25m
Ko Samui
Fri 7/11
12:05 pm-9:00 pm
2 stops22h 55m
$1,455
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Thu 6/5
1:40 pm-6:35 pm
1 stop38h 55m
Ko Samui
Sat 6/14
10:55 am-5:50 pm
1 stop20h 55m
$1,848
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Tue 6/10
11:30 am-7:50 am
1 stop30h 20m
Ko Samui
Tue 6/17
1:30 pm-9:40 am
1 stop34h 10m
$1,958
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Sat 7/12
1:05 am-12:45 pm
2 stops21h 40m
Ko Samui
Sun 7/20
10:05 am-7:54 am
3 stops35h 49m
$2,658
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Fri 6/13
5:05 pm-4:55 pm
2 stops33h 50m
Ko Samui
Fri 6/20
8:00 am-2:00 pm
2 stops44h 00m
$2,902
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Mon 6/30
12:00 pm-10:30 am
2 stops32h 30m
$654
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Sun 6/29
12:50 am-3:10 pm
2 stops24h 20m
$917
San FranciscoKo Samui
SFO - USM
SFOUSM
San Francisco
Mon 6/30
1:40 pm-6:35 pm
1 stop38h 55m
$1,002
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 April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on San Francisco-Ko Samui flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on San Francisco-Ko Samui flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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 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 April 30, 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.
Rainfall in Ko Samui by month
Plan your trip to Ko Samui by taking into account the average rainfall totals by month.
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.
Temperature in Ko Samui by month
Plan your trip to Ko Samui by taking into account the average temperature totals by month.
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).
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 April 30, 2025.
Overall
8.4
Crew
8.6
Food
8.1
Boarding
8.4
Comfort
8.3
Entertainment
8.0
Reviews
1 / 20
10.0
ExcellentDale,Apr 2025
SFO - TPE
Overall
8.4
Crew
8.6
Food
8.1
Boarding
8.4
Comfort
8.3
Entertainment
8.0
Reviews
1 / 20
10.0
ExcellentDale,Apr 2025
SFO - TPE
Overall
8.4
Crew
8.6
Food
8.1
Boarding
8.4
Comfort
8.3
Entertainment
8.0
Reviews
1 / 20
10.0
ExcellentDale,Apr 2025
SFO - TPE
Overall
8.4
Crew
8.6
Food
8.1
Boarding
8.4
Comfort
8.3
Entertainment
8.0
Reviews
1 / 20
10.0
ExcellentDale,Apr 2025
SFO - TPE
Overall
8.4
Crew
8.6
Food
8.1
Boarding
8.4
Comfort
8.3
Entertainment
8.0
Reviews
1 / 20
10.0
ExcellentDale,Apr 2025
SFO - TPE
Overall
8.4
Crew
8.6
Food
8.1
Boarding
8.4
Comfort
8.3
Entertainment
8.0
Reviews
1 / 20
10.0
ExcellentDale,Apr 2025
SFO - 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 San Francisco?
Book flights to San Francisco 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 April 30, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$873 | Average$1,151 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$1,041 | Average$1,138 | FlexibilityNo cancel fee | On-time74% |