$1,548+ Cheap flights from San Diego (SAN) 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 9/18. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — USM
ago. 25 — sep. 11
1 adult, Economy
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1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from San Diego to Ko Samui
Discover tips and strategies to find the most affordable flight options for your journey from San Diego (SAN) 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 agosto 20, 2025.
Round-trip from | $1,548 (Cathay Pacific) |
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Find flight deals from San Diego to Ko Samui
Cheapest flights from San Diego to Ko SamuiExplore the most affordable flight options available from San Diego to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 20, 2025.
Explore the most affordable flight options available from San Diego to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 20, 2025.
This Cathay Pacific deal was found by Cheapflights users on 8/18. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/184:59 pmSAN - USM
2 stops35h 36mCathay Pacific
lun. 9/2210:55 amUSM - SAN
2 stops26h 49mCathay Pacific
Deal found 8/18![Cathay Pacific logo]()
$1,548
Cheapflights Fare Finder
Customize your flight search to find flights from San Diego 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 agosto 20, 2025.
Use the filters below to find and compare flights from San Diego to Ko Samui that are best for you.
Fly from
San Diego
Fly to
Ko Samui
Route
Depart
Return
Price
San DiegoKo Samui
SAN - USM
SANUSM
San Diego
jue. 9/18
4:59 pm-6:35 pm
2 stops35h 36m
Ko Samui
lun. 9/22
10:55 am-11:44 pm
2 stops26h 49m
$1,548
Best time to book a flight from San Diego to Ko Samui
Have a flexible travel schedule? Discover the best time to fly to Ko Samui from San Diego 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 Diego to Ko Samui
What is the cheapest time of day to fly from SAN to USM?
Find hourly flight availability from San Diego 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 agosto 20, 2025.
When flying from San Diego to Ko Samui, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 28% versus a flight in the afternoon.
What is the cheapest day to fly from San Diego to Ko Samui?
Use this chart to determine the cheapest time to fly round-trip from San Diego to Ko Samui. Price data was last updated on March 30, 2025.
Travelers seeking maximum savings on their San Diego to Ko Samui flight should consider departing on Wednesday at noon when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Related info for your journey
Find useful and relevant information for your journey from San Diego to Ko Samui. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Ko Samui?
Book flights to Ko Samui if you plan to visit one of these locationsKo Tao
Ko Pha Ngan