SFO - USM

$505 Find Cheap Flights from San Francisco to Ko Samui - Compare and Save

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 11/18. 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
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Everything you should know

Cheapest round-trip
$817
Singapore Airlines
Mon 9/7Mon 9/14
SFO - USM • 1 stop
Cheapest one-way
$505
Singapore Airlines
Wed 11/18
SFO - USM • 1 stop
Top airlines
Cheapest • from $817 (round-trip)
Best reviews • 8.5 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between San Francisco and Ko Samui. You'll need at least 1 connection.
Insights
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Avoid delays
Most punctual • 91% on-time
Best time • Fewest delays
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ko Samui!
Flight Deals
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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

Mon, Sep 7 - Mon, Sep 14
Singapore Airlines Logo
11:45 am - 7:45 am
SFO
-
USM
30h 00m
1 stop
Singapore Airlines Logo
8:40 am - 9:50 am
USM
-
SFO
39h 10m
1 stop
$817Singapore Airlines
Mon, Sep 7 - Mon, Sep 14
Singapore Airlines Logo
11:45 am - 7:45 am
SFO
-
USM
30h 00m
1 stop
Singapore Airlines Logo
8:40 am - 9:50 am
USM
-
SFO
39h 10m
1 stop
$818Singapore Airlines
Mon, Sep 7 - Sun, Sep 13
Singapore Airlines Logo
11:45 am - 7:45 am
SFO
-
USM
30h 00m
1 stop
Singapore Airlines Logo
8:40 am - 9:50 am
USM
-
SFO
39h 10m
1 stop
$842Singapore Airlines
Wed, Nov 18 - Wed, Dec 2
Singapore Airlines Logo
9:40 am - 8:00 am
SFO
-
USM
31h 20m
1 stop
Singapore Airlines Logo
12:00 pm - 7:50 am
USM
-
SFO
34h 50m
1 stop
$845Singapore Airlines
Sun, Nov 22 - Mon, Nov 30
Singapore Airlines Logo
9:40 am - 8:00 am
SFO
-
USM
31h 20m
1 stop
Singapore Airlines Logo
12:00 pm - 7:50 am
USM
-
SFO
34h 50m
1 stop
$926Singapore Airlines
Sun, Nov 22 - Mon, Nov 30
Singapore Airlines Logo
9:40 am - 8:00 am
SFO
-
USM
31h 20m
1 stop
Singapore Airlines Logo
12:00 pm - 7:50 am
USM
-
SFO
34h 50m
1 stop
$927Singapore Airlines
Sat, Sep 12 - Mon, Sep 21
Singapore Airlines Logo
11:45 am - 6:50 pm
SFO
-
USM
41h 05m
1 stop
Singapore Airlines Logo
8:40 am - 9:50 am
USM
-
SFO
39h 10m
1 stop
$950Singapore Airlines
Tue, Nov 17 - Wed, Dec 2
Multiple Airlines Logo
12:30 am - 7:50 pm
SFO
-
USM
28h 20m
2 stops
Multiple Airlines Logo
7:00 am - 9:10 pm
USM
-
SFO
29h 10m
2 stops
$1,048Multiple Airlines
Mon, Sep 7 - Mon, Sep 14
Japan Airlines Logo
1:55 pm - 9:20 am
SFO
-
USM
29h 25m
2 stops
Japan Airlines Logo
6:00 am - 10:05 am
USM
-
SFO
42h 05m
2 stops
$1,058Japan Airlines
Mon, Sep 7 - Mon, Sep 14
Japan Airlines Logo
1:55 pm - 9:20 am
SFO
-
USM
29h 25m
2 stops
Japan Airlines Logo
6:00 am - 10:05 am
USM
-
SFO
42h 05m
2 stops
$1,059Japan Airlines
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.

Which airlines provide the cheapest flights from San Francisco to Ko Samui?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 5 days.

In the past 5 days, the cheapest round-trip tickets from San Francisco to Ko Samui were found on Singapore Airlines ($817) and Japan Airlines ($1,058).

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

Cheapest flight$505
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 5 days, the lowest price for a flight from San Francisco to Ko Samui was $505 for a one-way ticket and $817 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 $1,565 and an overall rating of 8.5, EVA Air is the most popular choice. Singapore Airlines is also a great choice for the route, with an average price of $942 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.
8.5
EVA AirOverall score based on 1484 reviews
8.7Crew
8.0Entertainment
8.4Boarding
8.1Food
8.3Comfort
Airline reviews

Premium Economy seats were more comfortable than other airlines I have recently been on. Great staff. Food was unremarkable.

8.0 ExcellentJack, Feb 2026
SFO - TPE
Read more EVA Air reviews

Premium Economy seats were more comfortable than other airlines I have recently been on. Great staff. Food was unremarkable.

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

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

The app was awful. No accurate info. Paying for internet is a negative (Delta is free). The crew was very nice for the most part although you are not guaranteed to get good service. Some crew would ignore requests for things as simple as a cup of water if you were sleeping when the first serving was made. Food was great. Male crew member was exceptionally kind and responsive.

The employees were professional and efficient. I consider myself a traveler but have trouble with the international fare served on airplanes. I admit Americans buy their food in the supermarket and we typically don’t eat the ligaments and cartilage. I know that is whiny but as I age, I dislike it more. At least things weren’t covered in cheese. The desserts are terrible! My neighbor didn’t eat her bread so I asked if I could have it. First time for everything but had been traveling a total of 27 hours and was hungry.

The night flight was only 2/3 full, which is always a plus. Room to stretch out for sleeping. Gracious stewardesses, attentive, and slim/attractive (which is rare these days). Good food, and curtesy wine.with meals. Comfortable seats and decent leg room (economy class)

Overall the flight was what might be expected for a long haul flight to Asia in economy class. The cabin crew was attentive and the food was good. Boarding was fairly fast and easy. The one thing I found frustrating was the EVA app. It is terrible. Trying to do anything on it was almost impossible.

EVA would not help with ticket issue since they were purchased through a travel agency. Even though it was EVA ticket stock. Travel agency Budget Air didn't reissue ticket after airline change which I didn’t learn until trying to checkin on Christmas Day and there was no contact number for the agency to help. I will never use Budget Air to purchase flight again and disappointed in EVA’s refusal to help. Thankfully just under 12 hrs before departure someone from the agency was available to reissue tickets. I was starting to think we would not be flying and the stress trying to resolve was completely unacceptable.

seamless check in/ friendly staff, food is good, always love flying Eva Air

Very uncomfortable and crowded seats in economy. Flight attendant refused request to move to nearby unused seat with more legroom because “It was more money for that seat”. It was also near impossible to reach airline directly by phone. Waits upwards of an hour and not very helpful customer service representatives after long wait. Cannot recommend this airline.

I had selected seats together for my family of three when I first booked my tickets in February. However, I realized only when I checked in at the airport that the seats I had selected were no longer assigned to us and we were completely scattered across three different middle seats instead of being seated together! After requesting the Singapore staff to have us seated together on a full flight, they managed to find something but it was right next to the rest rooms and the whole journey of 15+ hours was really unpleasant. They said that the seat selection isn't locked and the airline can reallocate the seats anytime. No one ever told us this and it was a terribly unpleasant surprise. Will avoid Kayak/underpricer and Singapore in future

Very concerned with guest comforts going out of their way to accommodate special dietary needs when the guests hadn’t pre-ordered.

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

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.

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.

Leg room and flight sound insulation is very bad. They broke 3 of my bags with bad handling

I commend the flight attendants on our SFO-SIN flight who went above and beyond to provide us with extra snacks and food. This type of service makes the flight experience personal and awesome.

People were so nice! Economy seats were small and cramped feeling for me. I’m slender and 6 feet tall

The singapore airline now compared before covid, I like the service before covid. SQ was the best of all airlines but now I am going to look for different airline if I am travelling in asia.

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

Information on your arrival and departure airports