SEA - USM

$455 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 3/15. 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
$863
Multiple Airlines
Sat 3/14Fri 3/27
SEA - USM • 2 stops
Cheapest one-way
$455
Multiple Airlines
Sun 3/15
SEA - USM • 2 stops
Our travelers' advice
AI-generated summary based on content written by travel experts
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 $939 (round-trip)
EVA Air
Best reviews • 8.4 score
Airline reviews
Airline reviews
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+1
Airline reviews
Airline reviews
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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
Booking Insights
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

Sat, Mar 14 - Fri, Mar 27
Multiple Airlines Logo
12:10 am - 8:25 pmSEA-USM
30h 15m2 stops
Multiple Airlines Logo
7:00 am - 2:55 pmUSM-SEA
21h 55m2 stops
$863Multiple Airlines
Find Deal
Sun, Nov 9 - Mon, Dec 15
Multiple Airlines Logo
11:45 pm - 8:10 amSEA-USM
41h 25m2 stops
Multiple Airlines Logo
8:30 am - 3:05 pmUSM-SEA
21h 35m2 stops
$889Multiple Airlines
Find Deal
Sun, Nov 9 - Mon, Dec 15
Multiple Airlines Logo
11:45 pm - 3:40 pmSEA-USM
24h 55m2 stops
Multiple Airlines Logo
7:15 am - 3:05 pmUSM-SEA
22h 50m2 stops
$899Multiple Airlines
Find Deal
Sun, Nov 9 - Mon, Dec 15
Singapore Airlines Logo
8:45 am - 8:00 amSEA-USM
32h 15m1 stop
Singapore Airlines Logo
7:45 pm - 7:10 amUSM-SEA
26h 25m1 stop
$939Singapore Airlines
Find Deal
Sun, Nov 9 - Mon, Dec 15
Singapore Airlines Logo
8:45 am - 8:00 amSEA-USM
32h 15m1 stop
Singapore Airlines Logo
6:05 pm - 7:10 amUSM-SEA
28h 05m1 stop
$968Singapore Airlines
Find Deal
Sun, Mar 15 - Sat, Mar 28
EVA Air Logo
1:10 am - 2:55 pmSEA-USM
23h 45m2 stops
EVA Air Logo
1:45 pm - 6:30 pmUSM-SEA
18h 45m2 stops
$1,010EVA Air
Find Deal
Sat, Nov 29 - Thu, Dec 4
EVA Air Logo
12:10 am - 5:00 pmSEA-USM
25h 50m2 stops
EVA Air Logo
2:05 pm - 6:10 pmUSM-SEA
19h 05m2 stops
$1,073EVA Air
Find Deal
Sun, Nov 30 - Thu, Dec 4
Cathay Pacific Logo
7:56 pm - 7:35 pmSEA-USM
32h 39m2 stops
Cathay Pacific Logo
11:40 am - 9:59 pmUSM-SEA
25h 19m2 stops
$1,256Cathay Pacific
Find Deal
Mon, Mar 16 - Thu, Mar 26
Cathay Pacific Logo
8:00 pm - 7:35 pmSEA-USM
33h 35m2 stops
Cathay Pacific Logo
11:40 am - 10:47 pmUSM-SEA
25h 07m2 stops
$1,261Cathay Pacific
Find Deal
Sun, Nov 9 - Mon, Dec 15
Malaysia Airlines Logo
4:05 pm - 6:55 pmSEA-USM
35h 50m3 stops
Malaysia Airlines Logo
3:50 pm - 9:50 amUSM-SEA
33h 00m3 stops
$2,918Malaysia Airlines
Find Deal
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.

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

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

Your flight ticket price will generally be cheaper if you fly to Ko Samui on a Tuesday and more expensive on a Sunday. On your return trip to Seattle, you should consider flying back on a Thursday, and avoid Sundays for better deals.

Expert advice

Expert advice for your flight from Seattle 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
Alaska Airlines

First Class offers 41" pitch, two free checked bags, and complimentary meals.


Alaska Airlines' 20-minute baggage guarantee offers 2,500 bonus miles if delayed.

JetBlue

JetBlue's Mint cabin offers lie-flat seats, priority boarding, and two free checked bags.


Enjoy free gate-to-gate Wi-Fi and seatback screens with live TV on JetBlue.

Read more about JetBlueby Harriet Baskas
Delta

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


Delta's Sky Clubs offer complimentary buffets and bars at over 30 airports.

Read more about Deltaby Stefanie Waldek
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on Alaska Airlines and JetBlue

Harriet Baskas

Harriet Baskas

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

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

Good to know

Low seasonNovember
Cheapest flight$455
Best time to beat the crowds with an average 23% drop in price.
Most popular time to fly with an average 37% increase in price.
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 $455 for a one-way ticket and $863 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.

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

    The two airlines most popular with KAYAK users for flights from Seattle to Ko Samui are EVA Air and Singapore Airlines. With an average price for the route of $1,351 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 $1,018 and an overall rating of 8.1.

  • 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 airlines 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.
8.4
EVA AirOverall score based on 1267 reviews
8.6Crew
8.4Boarding
8.3Comfort
8.0Entertainment
8.1Food
Airline reviews

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

10.0 ExcellentAnonymous, Oct 2025SFO - TPE
Read more EVA Air reviews

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

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. Oh and the seats were more comfortable, had more ability to lean and the headrest was much better for flight sleeping. 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..

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.

I was sleep when they brought the food. They had put a note on my seat. There was no food when I asked for food later. There was just one main meal served in this 14 hours flight. They offered me sandwich with ham which I don’t eat since I am pescatarian. Long story short I had to wait to get to TPE to get something to eat. I am extremely disappointed from the service. I have been flying EVA since I was 1 year old. Perhaps no more EVA for me. Seems EVA glorious day is long gone

I have difficulties to book wheelchair for my parents returned flight

Airline should consider adding a small meal at the last leg of the flight, right now there is 7 hours of no meal break.

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.

Loved the airline with the exception of their carry on limitations. They enforce a strict 7 kilo limit for carry on baggage which is ridiculous. We traveled from SFO to SIN with carry on with no difficulty yet when we checked in Delhi they forced us to check the carry on bags. The weight of our carry on bags were 11 and 12 kilos and while they exceeded the limitations set by Singapore Airlines they were well under weight limitations set by may other carriers. Interestingly my wife and I were each allowed two 22 KG bags to check in addition to the 7 kg carry on for a total weight of 102 KG's. Our total weight with the one bag we planned to check and our two carry ons was 46 kgs.

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.

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

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