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Ko Samui

$840+ Cheap flights from San Francisco (SFO) to Ko Samui (USM)

This is the cheapest round-trip 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
Mar 30 — Apr 61
Sun 3/30
Sun 4/6
1 adult, Economy
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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 March 25, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$840
(FlightHub)

Popular in

December

Cheapest in

October

Average price

$1,129
Provider with most accurate pricing for San Francisco-Ko Samui flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-Ko Samui flights.
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From San Francisco to Ko Samui
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($56 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($58 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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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 March 25, 2025.

This FlightHub deal was found by Cheapflights users on 3/24. 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 9/2412:05 pmUSM - SFO
1 stop35h 35mSingapore Airlines
Deal found 3/24$840
This oojo deal was found by Cheapflights users on 3/24. 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 4/1612:30 pmSFO - USM
2 stops29h 45mEVA Air
Wed 5/148:45 amUSM - SFO
2 stops25h 25mEVA Air
Deal found 3/24$1,005
This Trip.com deal was found by Cheapflights users on 3/25. 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 5/111:05 amSFO - USM
2 stops29h 25mMultiple Airlines
Tue 5/207:00 amUSM - SFO
2 stops26h 55mMultiple Airlines
Deal found 3/25$1,030
This Gurufare deal was found by Cheapflights users on 3/24. 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.
Wed 5/712:20 amSFO - USM
1 stop28h 15mCathay Pacific
Thu 5/1510:55 amUSM - SFO
1 stop20h 35mCathay Pacific
Deal found 3/24$1,373

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 25, 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 5/8

11:30 am-6:30 pm

1 stop41h 00m

Ko Samui

Thu 5/15

8:45 am-9:40 am

1 stop38h 55m

$993

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Wed 4/16

12:30 pm-8:15 am

2 stops29h 45m

Ko Samui

Wed 5/14

8:45 am-8:10 pm

2 stops25h 25m

$1,005

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sun 5/11

1:05 am-8:30 pm

2 stops29h 25m

Ko Samui

Tue 5/20

7:00 am-7:55 pm

2 stops26h 55m

$1,030

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Wed 5/7

12:20 am-6:35 pm

1 stop28h 15m

Ko Samui

Thu 5/15

10:55 am-5:30 pm

1 stop20h 35m

$1,373

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

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.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
ExpediaPrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • 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

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 25, 2025.

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 23, 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 March 25, 2025.
Get a feel of what it's like to fly with EVA Air, Singapore Airlines and Cathay Pacific from San Francisco to Ko Samui by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.4
Very good
1,170 reviews

Boarding

8.4

Comfort

8.3

Entertainment

8.0

Overall

8.4

Food

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.
EVA Air
8.4
Very good
1,170 reviews
EVA Air
8.4
Very good
1,170 reviews

Boarding

8.4

Comfort

8.3

Entertainment

8.0

Overall

8.4

Food

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.
Singapore Airlines
8.1
Very good
1,284 reviews
EVA Air
8.4
Very good
1,170 reviews

Boarding

8.4

Comfort

8.3

Entertainment

8.0

Overall

8.4

Food

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.
Cathay Pacific
7.5
Good
833 reviews
EVA Air
8.4
Very good
1,170 reviews

Boarding

8.4

Comfort

8.3

Entertainment

8.0

Overall

8.4

Food

8.0

Crew

8.6

Reviews

1 / 20
6.0
Good

Anonymous,Feb 2025

SFO - TPE

Inside plane was clean and chair was comfortable, but flight attendants serving coffee without giving me cream and sugar, even I ask he escape my request.

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.

  • 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 $840 on this airline. Additional options worth looking into are EVA Air and Cathay Pacific, starting at $1,005 and $1,373 round-trip. Singapore Airlines is priced at 37% 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 San Francisco?

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

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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 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
Singapore AirlinesCheapest$873Average$1,264FlexibilityNo cancel feeOn-time81%
EVA AirCheapest$1,041Average$1,139FlexibilityNo cancel feeOn-time74%
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