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$540 Find cheap flights from Washington to Koh Samui

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Koh Samui departing on 7/11. 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
0 bags
Sat 6/29
Sat 7/6

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Cheapest flight

$540
Flight from Seattle to Koh Samui

FAQs for booking flights from Washington to Koh Samui

  • How does KAYAK find such low prices on flights from Washington to Koh 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 Washington to Koh Samui.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Koh Samui from Washington 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 Washington to Koh 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 Koh Samui with an airline and back to Washington with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington to Koh 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 Koh Samui from Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Prefer to fly non-stop from Washington to Koh Samui?

Find which airlines fly direct from Washington to Ko Samui, which days they fly and book direct flights.

Nonstop departures

Washington to Ko Samui

Monday

Air Astana, Air France, Austrian Airlines, +25 more

Air Astana, Air France, +26 more

Tuesday

Air Astana, Air France, Austrian Airlines, +25 more

Air Astana, Air France, +26 more

Wednesday

Air Astana, Air France, Austrian Airlines, +25 more

Air Astana, Air France, +26 more

Thursday

Air Astana, Air France, Austrian Airlines, +25 more

Air Astana, Air France, +26 more

Friday

Air Astana, Air France, Austrian Airlines, +25 more

Air Astana, Air France, +26 more

Saturday

Air Astana, Air France, Austrian Airlines, +25 more

Air Astana, Air France, +26 more

Sunday

Air Astana, Air France, Austrian Airlines, +25 more

Air Astana, Air France, +26 more

See more direct flights

Nonstop returns

Ko Samui to Washington

Monday

Air Astana, Air France, Austrian Airlines, +25 more

Air Astana, Air France, +26 more

Tuesday

Air Astana, Air France, Austrian Airlines, +25 more

Air Astana, Air France, +26 more

Wednesday

Air Astana, Air France, Austrian Airlines, +25 more

Air Astana, Air France, +26 more

Thursday

Air Astana, Air France, Austrian Airlines, +25 more

Air Astana, Air France, +26 more

Friday

Air Astana, Air France, Austrian Airlines, +25 more

Air Astana, Air France, +26 more

Saturday

Air Astana, Air France, Austrian Airlines, +25 more

Air Astana, Air France, +26 more

Sunday

Air Astana, Air France, Austrian Airlines, +25 more

Air Astana, Air France, +26 more

See more direct flights
See more direct flights

Book cheap flights from Washington to Koh Samui

Recent round-trip flight deals

10/29Tue
2 stopsEVA Air
40h 35mSEA-USM
11/28Thu
2 stopsEVA Air
24h 40mUSM-SEA
$1,082
10/30Wed
2 stops
25h 20mSEA-USM
11/28Thu
2 stops
41h 35mUSM-SEA
$1,325
10/30Wed
3 stops
26h 56mSEA-USM
11/28Thu
2 stops
19h 15mUSM-SEA
$1,424
6/20Thu
2 stopsTurkish Airlines
57h 40mSEA-USM
6/27Thu
2 stopsTurkish Airlines
41h 15mUSM-SEA
$1,846
10/30Wed
3 stops
28h 57mSEA-USM
11/28Thu
3 stops
25h 13mUSM-SEA
$1,907
6/22Sat
2 stopsCathay Pacific
32h 36mPDX-USM
6/29Sat
2 stopsCathay Pacific
25h 42mUSM-PDX
$2,482
6/22Sat
2 stopsCathay Pacific
32h 36mPDX-USM
6/29Sat
3 stopsCathay Pacific
28h 37mUSM-PDX
$2,509
6/20Thu
2 stops
37h 10mSEA-USM
6/27Thu
3 stops
29h 15mUSM-SEA
$2,612
6/22Sat
3 stopsQatar Airways
32h 48mPDX-USM
6/29Sat
3 stopsQatar Airways
32h 50mUSM-PDX
$3,041
6/20Thu
3 stopsJapan Airlines
60h 20mSEA-USM
6/27Thu
3 stopsJapan Airlines
33h 21mUSM-SEA
$3,229

Search by stops

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Recent one-way flight deals

7/11Thu
2 stops
28h 45mSEA-USM
$540
7/9Tue
2 stops
28h 45mSEA-USM
$549
7/12Fri
2 stops
28h 45mSEA-USM
$589
7/10Wed
3 stops
49h 00mSEA-USM
$651
6/30Sun
2 stopsQatar Airways
27h 40mSEA-USM
$1,055
6/28Fri
2 stopsQatar Airways
27h 40mSEA-USM
$1,096
7/10Wed
2 stopsEVA Air
24h 55mSEA-USM
$1,108
7/5Fri
2 stopsEVA Air
40h 25mSEA-USM
$1,149
7/6Sat
1 stopSingapore Airlines
55h 50mSEA-USM
$1,195
7/11Thu
1 stopSingapore Airlines
55h 50mSEA-USM
$1,590

Search by stops

Search by airline

Search by price

Flights to Koh Samui

Destination:

Koh Samui (USM)Thailand

Cabin classes:

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