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Ko Samui

$722+ 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 10/22. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — USM
ago. 3 — ago. 101
dom. 8/3
dom. 8/10
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 julio 29, 2025.

Round-trip from

$722
(FlightHub)

Popular in

December

Cheapest in

October

Average price

$1,472
From San Francisco to Ko Samui
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($158 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($58 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 julio 29, 2025.

This FlightHub deal was found by Cheapflights users on 7/27. 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.
mié. 10/2211:30 amSFO - USM
1 stop30h 20mSingapore Airlines
mar. 11/117:25 pmUSM - SFO
1 stop27h 25mSingapore Airlines
Deal found 7/27$722
This AloTrip deal was found by Cheapflights users on 7/28. 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 AloTrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/112:00 pmSFO - USM
2 stops27h 20mMultiple Airlines
jue. 9/187:00 amUSM - SFO
2 stops41h 05mMultiple Airlines
Deal found 7/28$829
This Gurufare deal was found by Cheapflights users on 7/27. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/102:00 pmSFO - USM
2 stops28h 35mJapan Airlines
mié. 9/177:00 amUSM - SFO
2 stops41h 05mJapan Airlines
Deal found 7/27$852
This FlightHub deal was found by Cheapflights users on 7/29. 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.
mar. 10/2112:45 amSFO - USM
2 stops30h 05mEVA Air
mar. 11/111:55 pmUSM - SFO
2 stops19h 45mEVA Air
Deal found 7/29$994

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 julio 29, 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

mié. 10/22

11:30 am-7:50 am

1 stop30h 20m

Ko Samui

mar. 11/11

7:25 pm-7:50 am

1 stop27h 25m

$722

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

jue. 9/11

2:00 pm-7:20 am

2 stops27h 20m

Ko Samui

jue. 9/18

7:00 am-10:05 am

2 stops41h 05m

$829

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

mié. 9/10

2:00 pm-8:35 am

2 stops28h 35m

Ko Samui

mié. 9/17

7:00 am-10:05 am

2 stops41h 05m

$852

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

mar. 10/21

12:45 am-8:30 pm

2 stops29h 45m

Ko Samui

mar. 11/11

10:00 am-3:00 pm

2 stops20h 00m

$994

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

lun. 10/20

6:45 pm-8:15 am

2 stops47h 30m

Ko Samui

lun. 10/27

10:00 am-5:45 pm

2 stops45h 45m

$1,306

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

lun. 8/11

7:40 pm-9:10 pm

2 stops35h 30m

$2,743

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

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 julio 29, 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.

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 julio 29, 2025.
Get a feel of what it's like to fly with EVA Air, Japan Airlines, 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.
EVA Air
8.4
Very good
1,221 reviews

Boarding

8.4

Entertainment

8.0

Comfort

8.3

Crew

8.6

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
EVA Air
8.4
Very good
1,221 reviews
EVA Air
8.4
Very good
1,221 reviews

Boarding

8.4

Entertainment

8.0

Comfort

8.3

Crew

8.6

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Japan Airlines
8.3
Very good
1,535 reviews
EVA Air
8.4
Very good
1,221 reviews

Boarding

8.4

Entertainment

8.0

Comfort

8.3

Crew

8.6

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Singapore Airlines
8.1
Very good
1,338 reviews
EVA Air
8.4
Very good
1,221 reviews

Boarding

8.4

Entertainment

8.0

Comfort

8.3

Crew

8.6

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
SWISS
7.5
Good
1,683 reviews
EVA Air
8.4
Very good
1,221 reviews

Boarding

8.4

Entertainment

8.0

Comfort

8.3

Crew

8.6

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Turkish Airlines
7.3
Good
3,925 reviews
EVA Air
8.4
Very good
1,221 reviews

Boarding

8.4

Entertainment

8.0

Comfort

8.3

Crew

8.6

Food

8.1

Overall

8.4

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount

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 $722 on this airline. Additional options worth looking into are Japan Airlines and EVA Air, starting at $852 and $994 round-trip. Singapore Airlines is priced at 43% 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 Ko Samui?

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

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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 julio 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Singapore AirlinesCheapest$821Average$1,152FlexibilityNo cancel feeOn-time81%
EVA AirCheapest$1,048Average$1,130FlexibilityNo cancel feeOn-time74%

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