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Cheap flights from Portland to Ko Samui from $1,288

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to Ko Samui departing on 8/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Portland to Ko Samui

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
8:59 pm - 1:45 pm
PDX
-
USM
26h 46m
3 stops
Multiple Airlines Logo
9:00 pm - 7:52 am
USM
-
PDX
48h 52m
3 stops
$1,288Multiple Airlines
Fri, Aug 21 - Tue, Sep 1
Multiple Airlines Logo
8:30 pm - 1:45 pm
PDX
-
USM
27h 15m
3 stops
Multiple Airlines Logo
8:50 pm - 8:02 am
USM
-
PDX
49h 12m
3 stops
$1,436Multiple Airlines
Fri, May 8 - Fri, May 15
Cathay Pacific Logo
2:56 pm - 7:40 pm
PDX
-
USM
38h 44m
2 stops
Cathay Pacific Logo
11:55 am - 9:42 pm
USM
-
PDX
47h 47m
2 stops
$1,566Cathay Pacific
Fri, Aug 21 - Tue, Sep 1
Multiple Airlines Logo
5:35 pm - 7:10 am
PDX
-
USM
47h 35m
3 stops
Multiple Airlines Logo
11:55 am - 4:27 pm
USM
-
PDX
42h 32m
2 stops
$1,646Multiple Airlines
Fri, Aug 21 - Tue, Sep 1
Cathay Pacific Logo
10:30 am - 7:40 pm
PDX
-
USM
43h 10m
2 stops
Cathay Pacific Logo
11:55 am - 11:58 pm
USM
-
PDX
26h 03m
2 stops
$1,654Cathay Pacific
Sun, Apr 12 - Sun, Apr 19
Cathay Pacific Logo
11:47 pm - 7:40 pm
PDX
-
USM
53h 53m
2 stops
Cathay Pacific Logo
11:55 am - 9:35 pm
USM
-
PDX
23h 40m
2 stops
$1,658Cathay Pacific
Sun, Apr 12 - Sun, Apr 19
Cathay Pacific Logo
7:11 am - 7:40 pm
PDX
-
USM
46h 29m
2 stops
Cathay Pacific Logo
11:55 am - 4:38 pm
USM
-
PDX
42h 43m
2 stops
$1,730Cathay Pacific
Fri, May 8 - Fri, May 15
Cathay Pacific Logo
7:11 am - 7:10 am
PDX
-
USM
33h 59m
3 stops
Cathay Pacific Logo
11:55 am - 4:38 pm
USM
-
PDX
42h 43m
2 stops
$1,761Cathay Pacific
Fri, May 8 - Fri, May 15
Multiple Airlines Logo
7:45 pm - 1:10 pm
PDX
-
USM
27h 25m
2 stops
Multiple Airlines Logo
6:55 pm - 9:31 am
USM
-
PDX
28h 36m
2 stops
$1,802Multiple Airlines
Sun, Jun 28 - Sun, Jul 19
Multiple Airlines Logo
7:38 pm - 1:45 pm
PDX
-
USM
28h 07m
3 stops
Multiple Airlines Logo
2:00 pm - 11:30 pm
USM
-
PDX
23h 30m
3 stops
$1,879Multiple Airlines
Wed, Jun 10 - Thu, Jun 18

Cathay Pacific flights from Portland to Ko Samui

Our best Cathay Pacific deals on Portland to Ko Samui flight tickets
Cathay Pacific
Aug 21
PDX2:56 pmPortland
38h 44m
2 stops
USM7:40 pmKo Samui
Sep 1
USM11:55 amKo Samui
47h 47m
2 stops
PDX9:42 pmPortland
$1,566
Cathay Pacific
Apr 12
PDX10:30 amPortland
43h 10m
2 stops
USM7:40 pmKo Samui
Apr 19
USM11:55 amKo Samui
26h 03m
2 stops
PDX11:58 pmPortland
$1,654
Cathay Pacific
Apr 12
PDX11:47 pmPortland
53h 53m
2 stops
USM7:40 pmKo Samui
Apr 19
USM11:55 amKo Samui
23h 40m
2 stops
PDX9:35 pmPortland
$1,658

British Airways flights from Portland to Ko Samui

Our best British Airways deals on Portland to Ko Samui flight tickets
British Airways
Sep 12
PDX7:30 pmPortland
32h 45m
2 stops
USM6:15 pmKo Samui
Sep 16
USM4:25 pmKo Samui
39h 15m
2 stops
PDX5:40 pmPortland
$2,332
British Airways
Sep 12
PDX7:30 pmPortland
35h 40m
2 stops
USM9:10 pmKo Samui
Sep 16
USM4:25 pmKo Samui
39h 15m
2 stops
PDX5:40 pmPortland
$2,582
British Airways
Sep 12
PDX7:30 pmPortland
35h 40m
2 stops
USM9:10 pmKo Samui
Sep 16
USM4:25 pmKo Samui
39h 15m
2 stops
PDX5:40 pmPortland
$2,664

momondo 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, momondo users made 832,500 searches. Data last updated March 27, 2026.
Use the filters below to find and compare flights from Portland to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Fri 8/21

8:59 pm-1:45 pm

3 stops26h 46m

Ko Samui

Tue 9/1

9:00 pm-7:52 am

3 stops48h 52m

$1,288

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Fri 5/8

8:30 pm-1:45 pm

3 stops27h 15m

Ko Samui

Fri 5/15

8:50 pm-8:02 am

3 stops49h 12m

$1,436

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Fri 8/21

2:56 pm-7:40 pm

2 stops38h 44m

Ko Samui

Tue 9/1

11:55 am-9:42 pm

2 stops47h 47m

$1,566

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Fri 8/21

5:35 pm-7:10 am

3 stops47h 35m

Ko Samui

Tue 9/1

11:55 am-4:27 pm

2 stops42h 32m

$1,646

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sun 4/12

10:30 am-7:40 pm

2 stops43h 10m

Ko Samui

Sun 4/19

11:55 am-11:58 pm

2 stops26h 03m

$1,654

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sun 4/12

11:47 pm-7:40 pm

2 stops53h 53m

Ko Samui

Sun 4/19

11:55 am-9:35 pm

2 stops23h 40m

$1,658

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Fri 5/8

7:11 am-7:40 pm

2 stops46h 29m

Ko Samui

Fri 5/15

11:55 am-4:38 pm

2 stops42h 43m

$1,730

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Fri 5/8

7:11 am-7:10 am

3 stops33h 59m

Ko Samui

Fri 5/15

11:55 am-4:38 pm

2 stops42h 43m

$1,761

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Sun 6/28

7:45 pm-1:10 pm

2 stops27h 25m

Ko Samui

Sun 7/19

6:55 pm-9:31 am

2 stops28h 36m

$1,802
Quickest round-trip

PortlandKo Samui

PDX - USM

PDXUSM

Portland

Wed 6/10

7:38 pm-1:45 pm

3 stops28h 07m

Ko Samui

Thu 6/18

2:00 pm-11:30 pm

3 stops23h 30m

$1,879

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Ko Samui from

How to get the cheapest flight ticket from Portland to Ko Samui

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Ko Samui?

Our data shows that Friday is the least expensive day to fly to Ko Samui. Tickets to fly out on this day can be as low as $243. Flights from Portland to Ko Samui on a Saturday will generally be more expensive and average around $496. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Ko Samui?

Our data shows that the cheapest Portland to Ko Samui flights are usually those with departure times in the morning. Our users have found flights to Ko Samui in the morning for as low as $168. At noon is when there is more demand to fly to Ko Samui, so prices are often more expensive at around $508 per ticket.

When to book flights from Portland to Ko Samui

Are you open to changing your travel dates? Check out the ideal times to fly from Portland to Ko Samui according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Portland to Ko Samui (PDX to USM) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland to Ko Samui

Fastest flight time

26h 46m

Direct flights

None
The fastest flight from Portland to Ko Samui takes 26h 46m
There are no direct flights from Portland to Ko Samui. There are no popular flight routes from Portland to Ko Samui.
Search flight deals

  • How far is Portland to Ko Samui by plane?

    There are 7797.0 mi between Portland and Ko Samui. 26h 46m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Portland Airport to Ko Samui Airport?

    Prices for flights from Portland Airport to Ko Samui Airport are updated daily.

  • How old do you have to be to fly from Portland Airport to Ko Samui Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Portland Airport to Ko Samui Airport.

  • What documentation or ID do you need to fly to Ko Samui Airport?

    The necessary travel and health documents for your Ko Samui Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near Ko Samui?

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

Why use momondo?

Why should I use momondo to find a flight deal from Portland to Ko Samui?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ko Samui from Portland.

Can I find flights from Portland to Ko Samui with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Portland to Ko Samui flights to just show those with flexible booking policies.

How can momondo help me find flights from Portland to Ko Samui?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ko Samui from Portland.

I’m not ready to book a flight from Portland to Ko Samui right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Ko Samui, momondo offers a useful price alert feature which will track prices for flights to Ko Samui from Portland and alert you when they change.

An easier way to manage your Ko Samui trip

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