SFO - USM

$467 Find Cheap Flights from San Francisco to Ko Samui

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Francisco to Ko Samui departing on 3/5. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Ko Samui

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Francisco to Ko Samui, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Francisco to Ko Samui, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$811
Singapore Airlines
Sun 4/26Sun 5/10
SFO - USM • 1 stop
Cheapest one-way
$448
Overall average: $585
Multiple Airlines
Thu 3/5
SFO - USM • 2 stops
Our travelers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
Delta offers free Wi-Fi for SkyMiles members onboard.
Sun Country's Best seats have 34 inches of legroom.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Singapore Airlines
Cheapest • from $811 (round-trip)
EVA Air
Best reviews • 8.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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We hope you love your trip to Ko Samui!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from San Francisco to Ko Samui (SFO-USM)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Francisco to Ko Samui that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from San Francisco to Ko Samui

Sun, Apr 26 - Sun, May 10
Singapore Airlines Logo
11:00 am - 7:45 am
SFO
-
USM
30h 45m
1 stop
Singapore Airlines Logo
8:40 am - 9:10 am
USM
-
SFO
38h 30m
1 stop
$811Singapore Airlines
Sat, Apr 11 - Mon, Apr 20
Multiple Airlines Logo
12:50 am - 8:50 pm
SFO
-
USM
30h 00m
2 stops
Multiple Airlines Logo
9:15 am - 8:30 pm
USM
-
SFO
25h 15m
2 stops
$873Multiple Airlines
Sat, Apr 11 - Thu, Apr 30
Multiple Airlines Logo
12:50 am - 2:45 pm
SFO
-
USM
23h 55m
2 stops
Multiple Airlines Logo
2:35 pm - 8:30 pm
USM
-
SFO
19h 55m
2 stops
$877Multiple Airlines
Sun, Apr 12 - Thu, Apr 30
Singapore Airlines Logo
11:00 am - 6:50 pm
SFO
-
USM
41h 50m
1 stop
Singapore Airlines Logo
11:05 am - 9:10 am
USM
-
SFO
36h 05m
1 stop
$938Singapore Airlines
Sat, May 9 - Sun, May 31
EVA Air Logo
12:50 am - 3:10 pm
SFO
-
USM
24h 20m
2 stops
EVA Air Logo
8:50 pm - 6:45 am
USM
-
SFO
23h 55m
2 stops
$975EVA Air
Thu, Mar 26 - Thu, Apr 2
EVA Air Logo
12:00 pm - 7:45 am
SFO
-
USM
29h 45m
2 stops
EVA Air Logo
10:05 am - 8:00 pm
USM
-
SFO
23h 55m
2 stops
$979EVA Air
Wed, Feb 18 - Tue, Feb 24
EVA Air Logo
12:00 pm - 7:45 am
SFO
-
USM
28h 45m
2 stops
EVA Air Logo
6:30 pm - 6:30 am
USM
-
SFO
27h 00m
2 stops
$994EVA Air
Fri, Mar 20 - Mon, Mar 30
Singapore Airlines Logo
10:40 am - 5:10 pm
SFO
-
USM
40h 30m
1 stop
Singapore Airlines Logo
8:40 am - 9:10 am
USM
-
SFO
38h 30m
1 stop
$1,054Singapore Airlines
Thu, Mar 19 - Mon, Mar 30
EVA Air Logo
12:10 am - 3:40 pm
SFO
-
USM
25h 30m
2 stops
EVA Air Logo
9:15 am - 4:00 pm
USM
-
SFO
20h 45m
2 stops
$1,098EVA Air
Wed, Apr 8 - Sun, Apr 12
EVA Air Logo
12:50 am - 3:10 pm
SFO
-
USM
24h 20m
2 stops
EVA Air Logo
7:55 pm - 6:35 am
USM
-
SFO
48h 40m
2 stops
$1,105EVA Air
Booking Insights

KAYAK's insights & trends for San Francisco to Ko Samui flights

Get data-powered insights and trends into flights from San Francisco to Ko Samui to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from San Francisco to Ko Samui?

The average price of all round-trip flights from San Francisco to Ko Samui clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Ko Samui on a Monday, as we generally find the cheapest rates on that day for this route. On the other hand, Friday is the most expensive day to fly from San Francisco to Ko Samui. For your return ticket, we recommend flying on a Monday and avoiding Saturdays for the best deals.

Expert advice

Expert advice for your flight from San Francisco to Ko Samui

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Daniel Scheffler

Daniel Scheffler

Expert on Sun Country Air

Daniel Scheffler is a travel writer, podcaster, and producer. Born in Africa, bred in Europe and now living in America he has traveled to 140 countries (and all 50 U.S. states). Plus he has stayed at over 2500 hotels across the globe. His original shows Everywhere and Without Maps (available on Spotify) showcase his beliefs, travel is about humanity and sharing that beauty. And thus it reminds you that you shouldn’t believe everything you think.

Stefanie Waldek

Stefanie Waldek

Expert on Delta

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Good to know

Low seasonNovember
Cheapest flight$448
Best time to beat the crowds with an average 29% drop in price.
Most popular time to fly and prices are also 6% lower on average.
Flight from San Francisco to Ko Samui

When to book flights from San Francisco to Ko Samui

Are your dates flexible? Find out the best times to travel from San Francisco to Ko Samui based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from San Francisco to Ko Samui

  • What is the cheapest flight from San Francisco to Ko Samui?

    In the last 3 days, the lowest price for a flight from San Francisco to Ko Samui was $467 for a one-way ticket and $811 for a round-trip.

  • Do I need a passport to fly between San Francisco and Ko Samui?

    A passport is required to fly from San Francisco to Ko Samui.

  • Which airports will I be using when flying from San Francisco to Ko Samui?

    On your way to Ko Samui, you’ll fly out from San Francisco. You’ll be landing at Ko Samui.

  • Which aircraft models fly most regularly from San Francisco to Ko Samui?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from San Francisco to Ko Samui?

    Star Alliance is the only airline alliance operating flights between San Francisco and Ko Samui.

  • Which is the best airline for flights from San Francisco to Ko Samui, EVA Air or Singapore Airlines?

    The two airlines most popular with KAYAK users for flights from San Francisco to Ko Samui are EVA Air and Singapore Airlines. With an average price for the route of $1,093 and an overall rating of 8.4, EVA Air is the most popular choice. Singapore Airlines is also a great choice for the route, with an average price of $1,389 and an overall rating of 8.2.

  • How does KAYAK find such low prices on flights from San Francisco to Ko Samui?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from San Francisco to Ko Samui.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from San Francisco to Ko Samui?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ko Samui from San Francisco is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from San Francisco to Ko Samui?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ko Samui with an airline and back to San Francisco with another airline. Booking your flights between San Francisco and USM can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from San Francisco to Ko Samui?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ko Samui from San Francisco up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from San Francisco to Ko Samui

 
See real verified KAYAK customer reviews for airlines flying from San Francisco to Ko Samui. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from San Francisco to Ko Samui? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.4
EVA AirOverall score based on 1334 reviews
8.3Comfort
8.4Boarding
8.0Entertainment
8.6Crew
8.1Food
Airline reviews

From checking at the airport to end of flights, attentive and caring personnel, comfortable seating, great food. I plan on using EVA again. Thank you, all.

10.0 ExcellentAnonymous, Jan 2026
DFW - TPE
Read more EVA Air reviews

From checking at the airport to end of flights, attentive and caring personnel, comfortable seating, great food. I plan on using EVA again. Thank you, all.

Very nice, I feel I got good value for the price.

Amazing one of the best airlines i have ever traveled with. I live with medical issues called psoriatic arthritis and was in pain on the flight. The flight crew made sure I had fresh ice pack ever hour. Going above an beyond with service and care ⭐️⭐️⭐️⭐️⭐️.

Certain flight crew member were rude and short with me when I asked questions.

We were very impressed with the modern plane its amenities, as well as the services of flight attendants.

Everything was great, however the seats in the back are very small. Not as Comfortable as I would have liked.

The crew very accommodating and food too is good. Keep up the good work

The crews are very efficient. Other airlines should learn from them when it comes to boarding and departing from the airplane. They also display efficiency in serving meals. They don't keep the aisles blocked for hours like some other airlines. The food is poor. Generally the food was unrecognizable and poorly prepared. The only thing that made it better than US flag carriers is that there was a fresh fruit bowl with each meal.

Very good service and food. Crew was professional and considerate. Cabin and restrooms were kept clean

EVA airlines was excellent: on time or early, safe, courteous crew. Highly recommended.

No frills airline with minimal leg room and no entertainment

I wish there was a little more leg room between the seats. The recline was good and seats overall were comfortable. I also didn’t like the 2-4-2 configuration.

The flight arrived on time. 2×2 seating meant no one needed to sit in the middle. This was a connectibf flight from Singapore and required going to 3 counters in different levels to check a golf bag

toilets could be cleaned more frequently, everything else was pretty good.

The flight crew was phenominal! We couldn't have asked for any better. They were experienced professionals.

The crew was very courteous and professional. the flight is relatively clean and comfortable.

SQ service is great as always. However, the food quality seems to have gotten a lot worse recently.

Wish the underseat compartment don’t have a restriction, can fit a personal item such as backpack fully like most Boeing

Best airline I think. No problems with anything. Crew were great, no problems with the airline food and entertainment and a smooth flight.

Crew and service excellent. 2 hour delay for takeoff. SQ app showed flight on time.

Everything you need to know for your flight from San Francisco to Ko Samui

Information on your arrival and departure airports