Cheap flight deals from Portland to Koh Samui

We've found these cheap flights for you. You can book one-way or round-trip flight tickets.

Round-trip
One way

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

When is the cheapest time to fly from Portland to Koh Samui?

We monitor flight fares to help you find the best deals effortlessly

Cheapest flights

From price

13 20
20 27
May

27 4
4 11
11 18
18 25
Jun

25 1
1 8
8 15
15 22
22 29
Jul

29 6

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Frequently Asked Questions

When are flight tickets from Portland (PDX) to Koh Samui (USM) the cheapest?

Airlines adjust prices for flights from Portland to Koh Samui based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.
How much do flights from Portland (PDX) to Koh Samui (USM) cost?

According to Trip.com's data, the lowest price is around Rp 39,014,837.

How to find a cheap flight from Portland to Koh Samui

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from Portland to Koh Samui. Book your flights at the right time and save more.

Be flexible with your travel dates to get the cheapest Portland to Koh Samui ticket.

Tap "Date" on flight search bar to get the calender for Portland to Koh Samui airfare over next 6 months in 2025.

Compare cheap Portland to Koh Samui flight deals from hundreds of airlines.

Compare prices from over 500 airlines with our powerful search and find the cheapest flight tickets from Portland to Koh Samui.

Set up a Price Alert to track fare drops.

Set up a Price Alert for your Portland to Koh Samui route to track ticket prices effortlessly—no need to check manually every day.

Don't miss out on cheap Portland to Koh Samui flight deals and promo codes.

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Book early or wait unitl the last minute to fine the best fares.

It's always better to book early! Airlines typically release their lowest fares about a year before departure, so check as soon as flights become available. If you miss that window, you may still find great deals closer to your travel date.

Search for flights on the go.

For the best booking experience on the go, download Trip.com and search for cheap flights from Portland to Koh Samui to access exclusive deals just for you.