$494 Cheap Flights from Phoenix (PHX) to Samui Intl. Airport (USM)

View $494 flight on Tue, Nov 25, 2025Opens in a new window

Popular airlines from Phoenix Sky Harbor Intl. Airport (PHX) to Samui Intl. Airport (USM)

Cheap Flights from Phoenix to Samui Intl. Airport (PHX-USM)

Prices were available within the past 7 days and start at $494 for one-way flights and $831 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Aug 19 - Tue, Sep 9
PHX
Phoenix
USM
Koh Samui
$831 Roundtrip, found 3 days ago
$831
Roundtrip
found 3 days ago
Select United flight, departing Tue, Aug 19 from Phoenix to Koh Samui, returning Tue, Sep 9, priced at $831 found 3 days ago
United
Mon, Jul 7 - Mon, Jul 21
PHX
Phoenix
USM
Koh Samui
$851 Roundtrip, found 3 days ago
$851
Roundtrip
found 3 days ago
Select United flight, departing Mon, Jul 7 from Phoenix to Koh Samui, returning Mon, Jul 21, priced at $851 found 3 days ago
United
Tue, Nov 11 - Mon, Nov 24
PHX
Phoenix
USM
Koh Samui
$851 Roundtrip, found 1 day ago
$851
Roundtrip
found 1 day ago
Select United flight, departing Tue, Nov 11 from Phoenix to Koh Samui, returning Mon, Nov 24, priced at $851 found 1 day ago
United
Tue, Aug 26 - Sat, Sep 13
PHX
Phoenix
USM
Koh Samui
$852 Roundtrip, found 3 days ago
$852
Roundtrip
found 3 days ago
Select United flight, departing Tue, Aug 26 from Phoenix to Koh Samui, returning Sat, Sep 13, priced at $852 found 3 days ago
United
Thu, Aug 21 - Mon, Aug 25
PHX
Phoenix
USM
Koh Samui
$857 Roundtrip, found 2 days ago
$857
Roundtrip
found 2 days ago
Select United flight, departing Thu, Aug 21 from Phoenix to Koh Samui, returning Mon, Aug 25, priced at $857 found 2 days ago
United
Wed, Jul 16 - Wed, Jul 23
PHX
Phoenix
USM
Koh Samui
$859 Roundtrip, found 3 days ago
$859
Roundtrip
found 3 days ago
Select United flight, departing Wed, Jul 16 from Phoenix to Koh Samui, returning Wed, Jul 23, priced at $859 found 3 days ago
Cathay Pacific
Mon, Sep 1 - Tue, Sep 9
PHX
Phoenix
USM
Koh Samui
$1,637 Roundtrip, found 6 days ago
$1,637
Roundtrip
found 6 days ago
Select Cathay Pacific flight, departing Mon, Sep 1 from Phoenix to Koh Samui, returning Tue, Sep 9, priced at $1,637 found 6 days ago
KLM
Sat, Dec 6 - Wed, Dec 10
PHX
Phoenix
USM
Koh Samui
$1,783 Roundtrip, found 3 days ago
$1,783
Roundtrip
found 3 days ago
Select KLM flight, departing Sat, Dec 6 from Phoenix to Koh Samui, returning Wed, Dec 10, priced at $1,783 found 3 days ago
Air France
Sat, Dec 6 - Tue, Dec 23
PHX
Phoenix
USM
Koh Samui
$1,798 Roundtrip, found 3 days ago
$1,798
Roundtrip
found 3 days ago
Select Air France flight, departing Sat, Dec 6 from Phoenix to Koh Samui, returning Tue, Dec 23, priced at $1,798 found 3 days ago
British Airways
Tue, Nov 11 - Tue, Nov 18
PHX
Phoenix
USM
Koh Samui
$2,147 Roundtrip, found 6 days ago
$2,147
Roundtrip
found 6 days ago
Select British Airways flight, departing Tue, Nov 11 from Phoenix to Koh Samui, returning Tue, Nov 18, priced at $2,147 found 6 days ago

Alternative airports near Koh Samui

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Samui Intl. Airport USM. Cheapest and Closest option available. Average driving time to city center is 31 minutes. Flights from $851
USM
Samui Intl. Airport
CheapestClosest
Average driving time to city center31 min
Flights from $851
Flights from Phoenix (PHX) to Samui Intl. Airport (USM)
Origin airport
Sky Harbor Intl.
Destination airport
Samui Intl. Airport
Airlines serving
British Airways, Cathay Pacific
Roundtrip price
$831
Distance
8794 mi

Phoenix to Samui Intl. Airport Flights

The cheapest times to fly from Phoenix to Samui Intl. Airport

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Phoenix to Samui Intl. Airport are during the month of August. You can find some of the cheapest flights from Phoenix to Samui Intl. Airport with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Phoenix to Samui Intl. Airport

Sunday is one of the best days to book for cheap flights from Phoenix to Samui Intl. Airport: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Phoenix to Samui Intl. Airport

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Phoenix to Samui Intl. Airport in 2025. You can also book with separate airlines for your outbound and return journeys, from $494 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Phoenix to Samui Intl. Airport flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Phoenix to Samui Intl. Airport airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Sky Harbor Intl. Airport (PHX) to Ko Samui Airport (USM) cost?
Discover the latest flight deals from PHX to USM by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from PHX to USM?
The cheapest flights from PHX to USM are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from PHX to USM?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from PHX to USM. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Sky Harbor Intl. Airport (PHX) to Ko Samui Airport (USM)?
Nonstop flights from Sky Harbor Intl. Airport (PHX) to Ko Samui Airport (USM) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from PHX to USM?
Usually you'll find the widest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* But this can change based on the airline, time of year and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Sky Harbor Intl. Airport (PHX) to Ko Samui Airport (USM)?
To touch down at Ko Samui Airport (USM) on time, choose a flight that takes off from Sky Harbor Intl. Airport (PHX) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Sky Harbor Intl. Airport (PHX) to Ko Samui Airport (USM) last-minute?
Holding off until just before your trip to book your flight from PHX to USM often results in higher prices. While it's possible to find some last-minute discounts, they're not always guaranteed. Be flexible with your itinerary for the best chance of getting a bargain.
Is it cheaper to book a PHX to USM flight and hotel package?
Opting for a PHX to USM flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Select from our impressive range of hotels and then add activities, car rentals and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Sky Harbor Intl. Airport (PHX) to Ko Samui Airport (USM)?
Usually, it's possible to reschedule or cancel your PHX to USM flight. However, if it's been more than 24 hours since booking, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.