SEA - USM

$639 Find Cheap Flights from Seattle 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 Seattle to Ko Samui departing on 5/11. 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 Seattle 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 Seattle to Ko Samui, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$1,102
Singapore Airlines
Thu 10/22Mon 10/26
SEA - USM • 1 stop
Cheapest one-way
$639
Multiple Airlines
Mon 5/11
SEA - USM • 3 stops
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
JetBlue provides free gate-to-gate Wi-Fi and live TV.
Delta's Sky Clubs feature complimentary buffets and bars.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Singapore Airlines
Cheapest • from $1,102 (round-trip)
Singapore Airlines
Best reviews • 8.2 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Seattle and Ko Samui. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Avoid delays
Delta
Most punctual • 89% on-time
Night flights
Best time • Fewest delays
Insights
Insights
Insights
Insights
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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 Seattle to Ko Samui (SEA-USM)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle 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 Seattle to Ko Samui

Thu, Oct 22 - Mon, Oct 26
Singapore Airlines Logo
10:15 am - 5:20 pm
SEA
-
USM
41h 05m
1 stop
Singapore Airlines Logo
12:00 pm - 8:10 am
USM
-
SEA
34h 10m
1 stop
$1,102Singapore Airlines
Thu, Aug 27 - Sat, Sep 5
Multiple Airlines Logo
1:25 pm - 7:10 am
SEA
-
USM
27h 45m
2 stops
Multiple Airlines Logo
2:35 pm - 7:45 pm
USM
-
SEA
19h 10m
2 stops
$1,258Multiple Airlines
Thu, Aug 27 - Sat, Sep 5
Singapore Airlines Logo
10:15 am - 7:45 am
SEA
-
USM
31h 30m
1 stop
Singapore Airlines Logo
7:45 pm - 8:45 am
USM
-
SEA
27h 00m
1 stop
$1,271Singapore Airlines
Wed, Oct 21 - Mon, Oct 26
EVA Air Logo
1:30 am - 7:10 am
SEA
-
USM
39h 40m
2 stops
EVA Air Logo
10:00 am - 7:10 pm
USM
-
SEA
23h 10m
2 stops
$1,277EVA Air
Thu, Aug 27 - Sat, Sep 5
Multiple Airlines Logo
10:15 am - 7:45 am
SEA
-
USM
31h 30m
1 stop
Multiple Airlines Logo
8:45 am - 7:45 pm
USM
-
SEA
25h 00m
2 stops
$1,423Multiple Airlines
Thu, Aug 27 - Sat, Sep 5
Multiple Airlines Logo
11:40 am - 12:45 pm
SEA
-
USM
35h 05m
3 stops
Multiple Airlines Logo
2:35 pm - 7:45 pm
USM
-
SEA
19h 10m
2 stops
$1,427Multiple Airlines
Fri, Jul 31 - Sat, Aug 15
Singapore Airlines Logo
10:15 am - 7:45 am
SEA
-
USM
31h 30m
1 stop
Singapore Airlines Logo
8:40 am - 8:45 am
USM
-
SEA
38h 05m
1 stop
$1,530Singapore Airlines
Fri, Jul 31 - Sat, Aug 15
Singapore Airlines Logo
10:15 am - 5:20 pm
SEA
-
USM
41h 05m
1 stop
Singapore Airlines Logo
8:40 am - 8:45 am
USM
-
SEA
38h 05m
1 stop
$1,531Singapore Airlines
Tue, Jul 21 - Tue, Aug 4
EVA Air Logo
2:10 am - 3:10 pm
SEA
-
USM
23h 00m
2 stops
EVA Air Logo
9:00 pm - 7:50 pm
USM
-
SEA
36h 50m
2 stops
$1,551EVA Air
Tue, Jul 14 - Wed, Jul 22
EVA Air Logo
1:10 am - 3:25 pm
SEA
-
USM
24h 15m
2 stops
EVA Air Logo
8:30 am - 7:50 pm
USM
-
SEA
25h 20m
2 stops
$1,561EVA Air
Booking Insights

KAYAK's insights & trends for Seattle to Ko Samui flights

Get data-powered insights and trends into flights from Seattle 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 Seattle to Ko Samui?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Seattle to Ko Samui were found on Singapore Airlines ($1,102) and EVA Air ($1,277).

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Expert advice

Expert advice for your flight from Seattle 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
Harriet Baskas

Harriet Baskas

Expert on Alaska Airlines and JetBlue

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
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.

Read more

Good to know

Cheapest flight$639
Flight from Seattle to Ko Samui

When to book flights from Seattle to Ko Samui

Are your dates flexible? Find out the best times to travel from Seattle 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 Seattle to Ko Samui

  • What is the cheapest flight from Seattle to Ko Samui?

    In the last 3 days, the lowest price for a flight from Seattle to Ko Samui was $627 for a one-way ticket and $1,102 for a round-trip.

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

    Yes, you'll most likely have to show a valid passport before boarding the plane in Seattle and on arrival in Ko Samui.

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

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

  • Which airline alliances offer flights from Seattle to Ko Samui?

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

  • How does KAYAK find such low prices on flights from Seattle 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 Seattle to Ko Samui.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ko Samui from Seattle 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 Seattle 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 Seattle with another airline. Booking your flights between Seattle 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 Seattle 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 Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Seattle to Ko Samui

 
See real verified KAYAK customer reviews for airlines flying from Seattle 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 Seattle 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.
8.2
Singapore AirlinesOverall score based on 1505 reviews
8.3Boarding
7.8Food
8.6Crew
8.0Entertainment
8.0Comfort
Airline reviews

I had ordered vegetarian food. What I was presented was extremely dissatisfying and not up to the mark. I pretty much did not eat entire 19 hours. For.an airline voted as best in business, it was extremely disappointing. Seats were not comfortable to sleep. Entertainment system didn’t have much choice. WiFi didn’t work for more than half the time. Cabin crew were also difficult to understand. A bit of diversity like Emirates crew would go a long way.

2.0 MediocreGhansham, Apr 2026
EWR - SIN
Read more Singapore Airlines reviews

I had ordered vegetarian food. What I was presented was extremely dissatisfying and not up to the mark. I pretty much did not eat entire 19 hours. For.an airline voted as best in business, it was extremely disappointing. Seats were not comfortable to sleep. Entertainment system didn’t have much choice. WiFi didn’t work for more than half the time. Cabin crew were also difficult to understand. A bit of diversity like Emirates crew would go a long way.

A little more room from the reclining seat in the front of me.

Crew is excellent Wifi needs to be improved in order to connect to the internet.

They ran out of the second choice of food was stuck with fish

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.

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.

Pleasant business class flight experience with good onboarding experience. Flight service team was excellent with usual book-the-chef menu available

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

Everything you need to know for your flight from Seattle to Ko Samui

Information on your arrival and departure airports

Seattle (SEA)
Ko Samui (USM)