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Ko Samui

$1,073+ Cheap flights from Portland (PDX) 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 1/22. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — USM
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from Portland to Ko Samui

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) 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 September 17, 2025.

Round-trip from

$1,073
(CheapOair)
From Portland to Ko Samui
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Find flight deals from Portland to Ko Samui

Cheapest flights from Portland to Ko Samui
Explore the most affordable flight options available from Portland to Ko Samui. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This Gotogate deal was found by Cheapflights users on 9/15. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/303:15 pmPDX - USM
2 stops31h 50mMultiple Airlines
Thu 11/69:10 pmUSM - PDX
2 stops32h 35mMultiple Airlines
Deal found 9/15$1,194
This Gurufare deal was found by Cheapflights users on 9/17. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/116:00 pmPDX - USM
3 stops29h 45mMultiple Airlines
Mon 10/209:00 pmUSM - PDX
3 stops47h 20mMultiple Airlines
Deal found 9/17$1,382
This Gurufare deal was found by Cheapflights users on 9/15. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/238:37 pmPDX - USM
3 stops27h 08mMultiple Airlines
Tue 9/302:00 pmUSM - PDX
3 stops30h 17mMultiple Airlines
Deal found 9/15$1,408
This FlightHub deal was found by Cheapflights users on 9/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1211:07 amPDX - USM
2 stops41h 28mCathay Pacific
Mon 10/2010:55 amUSM - PDX
2 stops23h 54mCathay Pacific
Deal found 9/17$1,593
This oojo deal was found by Cheapflights users on 9/17. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/115:45 pmPDX - USM
2 stops34h 50mCathay Pacific
Mon 10/2010:55 amUSM - PDX
2 stops23h 54mCathay Pacific
Deal found 9/17$1,630
This Ovago deal was found by Cheapflights users on 9/17. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/105:55 pmPDX - USM
2 stops34h 40mCathay Pacific
Mon 10/2010:55 amUSM - PDX
2 stops26h 29mCathay Pacific
Deal found 9/17$1,663
This FlightHub deal was found by Cheapflights users on 9/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/115:45 pmPDX - USM
2 stops34h 50mCathay Pacific
Sun 10/1910:55 amUSM - PDX
2 stops23h 54mCathay Pacific
Deal found 9/17$1,752
This Ovago deal was found by Cheapflights users on 9/17. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/105:55 pmPDX - USM
2 stops34h 40mCathay Pacific
Sun 10/1910:55 amUSM - PDX
2 stops23h 54mCathay Pacific
Deal found 9/17$1,767

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland 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 September 17, 2025.
Use the filters below to find and compare flights from Portland to Ko Samui that are best for you.

Fly from

Portland

Fly to

Ko Samui

Route

Depart

Return

Price

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 1/22

3:15 pm-9:20 am

2 stops27h 05m

Ko Samui

Tue 1/27

9:10 pm-9:15 am

2 stops27h 05m

$1,073

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Wed 1/21

7:00 pm-11:35 am

2 stops25h 35m

Ko Samui

Sat 1/31

1:25 pm-9:15 am

2 stops34h 50m

$1,142

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Wed 2/4

7:00 pm-6:15 pm

2 stops32h 15m

Ko Samui

Wed 2/18

4:25 pm-9:15 am

2 stops31h 50m

$1,151

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sun 2/1

7:00 pm-1:05 pm

2 stops27h 05m

Ko Samui

Sat 2/14

6:05 pm-2:45 pm

2 stops35h 40m

$1,183

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Thu 10/30

3:15 pm-1:05 pm

2 stops31h 50m

Ko Samui

Thu 11/6

9:10 pm-2:45 pm

2 stops32h 35m

$1,194

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sat 2/21

7:45 pm-3:35 pm

3 stops28h 50m

Ko Samui

Thu 3/5

2:05 pm-10:26 pm

3 stops23h 21m

$1,195

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Best time to book a flight from Portland to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from Portland 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 Portland to Ko Samui

What is the cheapest time of day to fly from PDX to USM?

Find hourly flight availability from Portland 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 September 17, 2025.

One of the essential ways to save on airfare from Portland to Ko Samui is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 67% on airfare.

What is the cheapest day to fly from Portland to Ko Samui?

Use this chart to determine the cheapest time to fly round-trip from Portland to Ko Samui. Price data was last updated on March 30, 2025.

Travelers seeking maximum savings on their Portland to Ko Samui flight should consider departing on Tuesday at noon when fares are most often at their lowest. Sunday mornings 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 Portland to Ko Samui. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • Can I find deals for flights from Portland to Ko Samui that include hotel bookings?

    Yes. In addition to deals on Portland to Ko Samui flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portland to Ko Samui?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to Ko Samui.

  • Can I find deals for business class flights from Portland to Ko Samui?

    Yes. Cheapflights offers flight deals from Portland to Ko Samui by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Tao
Ko Pha Ngan

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