SFO - USM

$359 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 11/9. 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

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
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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

Wed, Oct 22 - Tue, Nov 11
Singapore Airlines Logo
11:30 am - 7:50 amSFO-USM
30h 20m1 stop
Singapore Airlines Logo
6:05 pm - 7:50 amUSM-SFO
28h 45m1 stop
$757Singapore Airlines
Find Deal
Mon, Oct 20 - Tue, Jan 20
Singapore Airlines Logo
11:30 am - 7:50 amSFO-USM
30h 20m1 stop
Singapore Airlines Logo
6:05 pm - 7:50 amUSM-SFO
28h 45m1 stop
$765Singapore Airlines
Find Deal
Sun, Nov 9 - Sun, Nov 23
Singapore Airlines Logo
9:40 am - 8:00 amSFO-USM
31h 20m1 stop
Singapore Airlines Logo
7:45 pm - 7:50 amUSM-SFO
27h 05m1 stop
$814Singapore Airlines
Find Deal
Wed, Nov 5 - Fri, Nov 14
Singapore Airlines Logo
9:40 am - 8:00 amSFO-USM
31h 20m1 stop
Singapore Airlines Logo
7:45 pm - 7:50 amUSM-SFO
27h 05m1 stop
$843Singapore Airlines
Find Deal
Tue, Oct 21 - Tue, Nov 11
EVA Air Logo
12:45 am - 8:50 pmSFO-USM
30h 05m2 stops
EVA Air Logo
1:45 pm - 6:40 pmUSM-SFO
19h 55m2 stops
$942EVA Air
Find Deal
Mon, Sep 29 - Wed, Oct 29
EVA Air Logo
1:00 pm - 8:35 amSFO-USM
29h 35m2 stops
EVA Air Logo
1:45 pm - 7:40 pmUSM-SFO
19h 55m2 stops
$955EVA Air
Find Deal
Fri, Feb 27 - Sun, Mar 8
 Logo
12:00 pm - 7:10 amSFO-USM
28h 10m2 stops
 Logo
7:00 am - 5:40 amUSM-SFO
37h 40m2 stops
Mon, Oct 6 - Mon, Oct 20
 Logo
4:45 pm - 6:30 pmSFO-USM
35h 45m3 stops
 Logo
8:55 am - 9:30 amUSM-SFO
38h 35m3 stops
$1,143
Find Deal
Mon, Oct 13 - Tue, Oct 21
Cathay Pacific Logo
12:20 am - 6:35 pmSFO-USM
28h 15m1 stop
Cathay Pacific Logo
10:55 am - 10:40 pmUSM-SFO
25h 45m1 stop
$1,395Cathay Pacific
Find Deal
Mon, Oct 13 - Tue, Oct 21
Cathay Pacific Logo
12:20 am - 6:35 pmSFO-USM
28h 15m1 stop
Cathay Pacific Logo
8:45 am - 5:30 pmUSM-SFO
22h 45m2 stops
$1,418Cathay Pacific
Find Deal

Everything you should know

Our travelers' advice
AI-generated summary based on content written by travel experts
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 $757 (round-trip)
EVA Air
Best reviews • 8.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
October
Cheapest • 17% price drop
March
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$757
Overall average: $1,042
Singapore Airlines
Wed 10/22Tue 11/11
SFO - USM • 1 stop
Cheapest one-way
$359
Overall average: $605
Multiple Airlines
Sun 11/9
SFO - USM • 3 stops
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ko Samui!
Expert advice

Expert advice for your flight from San Francisco to Ko Samui

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
Sun Country Air

Sun Country's Best seats offer 34 inches legroom, preferred boarding, and free entertainment.


Sun Country's app provides easy check-in and mobile boarding passes for convenience.

Delta

Delta One offers lie-flat seats with privacy doors on select aircraft for enhanced comfort.


Free Wi-Fi for SkyMiles members on most flights; sign up onboard if not a member.

Read more about Deltaby Stefanie Waldek
Our travel experts
Daniel Scheffler

Daniel Scheffler

Expert on Sun Country Air

Daniel Scheffler

Daniel Scheffler

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.

Read more
Stefanie Waldek

Stefanie Waldek

Expert on Delta

Stefanie Waldek

Stefanie Waldek

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.

Read more
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.

What is the cheapest month to fly from San Francisco to Ko Samui?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Francisco to Ko Samui, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from San Francisco to Ko Samui is October, where tickets cost $1,042 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $1,625 and $1,584 respectively.

Good to know

Low seasonMay
Cheapest flight$359
Best time to beat the crowds with an average 12% drop in price.
Most popular time to fly and prices are also 11% 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 $359 for a one-way ticket and $757 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, and oneworld are the airline alliances operating flights between San Francisco and Ko Samui, with Star Alliance being the most commonly used for this route.

  • 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 $1,129 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 $1,149 and an overall rating of 8.1.

  • 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 1236 reviews
8.0Entertainment
8.4Boarding
8.6Crew
8.1Food
8.3Comfort
Airline reviews

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

10.0 ExcellentDale, Aug 2025SFO - TPE
Read more EVA Air reviews

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.

Flight Attendants could have been nicer and food portions could be bigger.

Great experience, comfort and food is delicious. Always great service and one time

The food from Los Angeles to Taipei made me throw up. The flight is also not comfort. But the staffs are very friendly and nice.

I have never heard of EVA air before but I am so happy my wife and I were able to flight on their planes twice. Everything on these flights just felt better than their competitors. As someone with longer legs any bit of extra leg spaces is appreciated. The different options for food and drinks were also a plus. They were extra careful to make sure my wife's eating restrictions were taken care for. They had a before take off and landing announcements on the built in tablets for each seat and it gave out information that was very helpful. Such as what and how to declare your items in the specific country you landed in, any odd items that may be illegal to bring it (and even the reasoning why) and any other information you might need to make your post flight experience better. The only downside was there were "forced" ads on the tablet at take off for maybe 5-10 minutes but honestly, this flight was the cheapest option and had all the benefits listed above that is such an easy trade off. Im keeping an eye out for EVA air going forward.

First time traveling with EVA.. great experience in economy class... Personnel very friendly..

Sub sandwhich for a snack through mid flight and giving a bottle water was a good idea

For the price, it was better than other airlines; quality of food and service was very good.

I appreciate the email reminders for online check-in which made my entry to the lines less stressful. The flight was on schedule and on time. The baording staff were proactively helpful and approachable. The airplane inflight food, entertainment and comfies as well as provisions are excellent even in the economy seating. The airline transfer was smooth and easy! Luggage safe and intact! Thank you EVA airline for making my trip a reliable safe and comfortable experience.

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

Very good flight from Boarding to landing -efficient and comfortable with decent entertainment options

Construction at PDX resulting in very lung walk from the rental car to the gate. SFO, extremely long walk between terminals to get to connecting Singapore airlines flight. My smart watch recorded a total of 3 miles.

Crew and service was excellent, but passengers should be offered a welcome drink before take off which did not happen. Food was very good. Unfortunately the lie-flat bed in business class was one of the most uncomfortable I have experienced. The configuration forces you to sleep with your legs at an angle instead of in a straight line, plus there is very little padding on the bed so it wasn't possible to sleep for more than 2-3 hours on an 18 hour flight. For what the airlines charges for a business class ticket their hard product leaves a lot to be desired.

Everything was great keep up the good work 😁, can't ask for more.

Flight from SFO did not include entertainment as it was not working the entire duration of the flight. Was informed that there would be a $350 voucher for the inconvenience. Uncertain how the voucher will be provided.

The food options and quality could use some more excitement and variety.

Overall, very good. The food was better than expected with the exception of the pork and potatoes dinner at the end of the flight. My family all selected that dish and did not set it. I tried a bite also and it was honestly terrible. Also, it would be helpful to know when the snacks in the back of the plane are available.

Crews were very caring and polite. Washroom was surprisingly clean. Overall experience was good , only food choices was very limited. Thanks

On time boarding I would like to see ground hostess to help transit customers to direct them to the right terminal and boarding gate. Last night, all the transit customers on SQ484 arriving Singapore had to merry go round to look for terminal and boarding gate to board SQ128 transit to KL Malaysia. We went to Terminal 3 taking the Skytrain to T3 and back to T3 to get out to look for different Skytrain to T2. On arrival t2, we had to go round to ask which boarding gate to KL. We only had 5 minutes to make to the boarding time at 6:55pm but we already spent more than 30 minutes running around to find the boarding gate. We were late at the boarding gate.

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

Information on your arrival and departure airports

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