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Ko Samui

$750+ 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
Jun 23 — Jun 301
Mon 6/23
Mon 6/30
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 June 18, 2025.

Round-trip from

$804
(FlightHub)

Popular in

December

Cheapest in

October

Average price

$1,524
From San Francisco to Ko Samui
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($119 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($60 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 18, 2025.

This FlightHub deal was found by Cheapflights users on 6/18. 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 10/2211:30 amSFO - USM
1 stop30h 20mSingapore Airlines
Tue 11/117:25 pmUSM - SFO
1 stop27h 25mSingapore Airlines
Deal found 6/18$750
This Trip.com deal was found by Cheapflights users on 6/18. 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.
Thu 8/281:10 pmSFO - USM
2 stops28h 10mMultiple Airlines
Sun 9/77:10 pmUSM - SFO
2 stops29h 30mMultiple Airlines
Deal found 6/18$947
This FlightHub deal was found by Cheapflights users on 6/16. 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 10/81:10 amSFO - USM
2 stops29h 20mEVA Air
Sun 10/269:25 pmUSM - SFO
2 stops32h 35mEVA Air
Deal found 6/16$1,011
This Kissandfly.com deal was found by Cheapflights users on 6/16. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/101:31 pmSFO - USM
2 stops39h 04mBangkok Airways
Thu 7/241:30 pmUSM - SFO
1 stop21h 50mBangkok Airways
Deal found 6/16$1,237
This Gurufare deal was found by Cheapflights users on 6/18. 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 8/271:05 amSFO - USM
1 stop27h 30mCathay Pacific
Sun 9/710:55 amUSM - SFO
1 stop26h 00mCathay Pacific
Deal found 6/18$1,386
This Emirates deal was found by Cheapflights users on 6/15. 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 11/143:40 pmSFO - USM
2 stops49h 30mEmirates
Tue 11/187:10 pmUSM - SFO
2 stops32h 40mEmirates
Deal found 6/15$1,545
This business-class.com deal was found by Cheapflights users on 6/18. 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 10/68:59 pmSFO - USM
3 stops25h 46mChina Airlines
Thu 10/162:35 pmUSM - SFO
2 stops19h 20mChina Airlines
Deal found 6/18$2,526
This SWISS deal was found by Cheapflights users on 6/16. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/257:30 pmSFO - USM
2 stops28h 15mSWISS
Wed 7/210:05 amUSM - SFO
2 stops44h 30mSWISS
Deal found 6/16$3,927
This oojo deal was found by Cheapflights users on 6/16. 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.
Mon 9/112:25 pmSFO - USM
2 stops30h 10mJapan Airlines
Mon 9/157:10 pmUSM - SFO
2 stops28h 55mJapan Airlines
Deal found 6/16$4,679
This FlightHub deal was found by Cheapflights users on 6/16. 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 9/13:55 pmSFO - USM
2 stops28h 35mQatar Airways
Tue 9/165:55 pmUSM - SFO
2 stops33h 40mQatar Airways
Deal found 6/16$5,243
This FlightHub deal was found by Cheapflights users on 6/16. 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 9/2911:55 pmSFO - USM
2 stops30h 55mPhilippine Airlines
Tue 10/148:00 amUSM - SFO
2 stops26h 50mPhilippine Airlines
Deal found 6/16$5,319

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 June 18, 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 8/28

11:30 am-7:50 am

1 stop30h 20m

Ko Samui

Sun 9/7

5:40 pm-9:40 am

1 stop30h 00m

$804

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Thu 8/28

1:10 pm-7:20 am

2 stops28h 10m

Ko Samui

Sun 9/7

7:10 pm-10:40 am

2 stops29h 30m

$947

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Wed 8/27

1:25 am-2:45 pm

2 stops23h 20m

Ko Samui

Sun 9/7

7:15 pm-6:50 am

2 stops25h 35m

$1,011

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Thu 7/10

1:31 pm-6:35 pm

2 stops39h 04m

Ko Samui

Thu 7/24

1:30 pm-9:20 pm

1 stop21h 50m

$1,237

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Wed 8/27

1:05 am-6:35 pm

1 stop27h 30m

Ko Samui

Sun 9/7

10:55 am-10:55 pm

1 stop26h 00m

$1,386

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Wed 6/25

7:30 pm-1:45 pm

2 stops28h 15m

Ko Samui

Wed 7/2

10:05 am-4:35 pm

2 stops44h 30m

$3,927

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Thu 7/31

5:05 pm-9:10 pm

2 stops62h 05m

Ko Samui

Thu 8/7

5:50 pm-2:00 pm

2 stops34h 10m

$4,582

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Mon 9/1

12:25 pm-8:35 am

2 stops30h 10m

Ko Samui

Mon 9/15

7:10 pm-10:05 am

2 stops28h 55m

$4,679

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Mon 9/1

3:55 pm-10:30 am

2 stops28h 35m

Ko Samui

Tue 9/16

5:55 pm-1:35 pm

2 stops33h 40m

$5,243

San FranciscoKo Samui

SFO - USM

SFOUSM

San Francisco

Sun 9/7

6:45 pm-3:45 pm

2 stops31h 00m

Ko Samui

Tue 9/23

5:35 pm-10:35 am

2 stops31h 00m

$5,359

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/16

Showing 1-10 of 13 results
1
2

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 June 18, 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 June 18, 2025.
EVA Air
8.4
Very good
1,205 reviews

Crew

8.6

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

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
1,205 reviews
EVA Air
8.4
Very good
1,205 reviews

Crew

8.6

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

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
1,494 reviews
EVA Air
8.4
Very good
1,205 reviews

Crew

8.6

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

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
Emirates
8.1
Very good
3,273 reviews
EVA Air
8.4
Very good
1,205 reviews

Crew

8.6

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

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
1,310 reviews
EVA Air
8.4
Very good
1,205 reviews

Crew

8.6

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

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
Bangkok Airways
8.0
Very good
111 reviews
EVA Air
8.4
Very good
1,205 reviews

Crew

8.6

Entertainment

8.0

Overall

8.4

Boarding

8.4

Comfort

8.3

Food

8.1

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 $804 on this airline. Additional options worth looking into are EVA Air and Bangkok Airways, starting at $1,011 and $1,237 round-trip. Singapore Airlines is priced at 36% 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 June 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Singapore AirlinesCheapest$825Average$1,170FlexibilityNo cancel feeOn-time81%
EVA AirCheapest$1,048Average$1,129FlexibilityNo cancel feeOn-time74%

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