$709 Cheap Flights from Philadelphia (PHL) to Samui Intl. Airport (USM)

View $709 flight on Sun, Jan 18, 2026Opens in a new window

Popular airlines from Philadelphia Intl. Airport (PHL) to Samui Intl. Airport (USM)

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Cheap Flights from Philadelphia to Samui Intl. Airport (PHL-USM)

Prices were available within the past 7 days and start at $709 for one-way flights and $1,284 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Qatar Airways
Tue, Feb 3 - Thu, Feb 26
PHL
Philadelphia
USM
Koh Samui
$1,284 Roundtrip, found 21 hours ago
$1,284
Roundtrip
found 21 hours ago
Select Qatar Airways flight, departing Tue, Feb 3 from Philadelphia to Koh Samui, returning Thu, Feb 26, priced at $1,284 found 21 hours ago
Qatar Airways
Fri, Nov 28 - Sun, Dec 7
PHL
Philadelphia
USM
Koh Samui
$1,289 Roundtrip, found 14 hours ago
$1,289
Roundtrip
found 14 hours ago
Select Qatar Airways flight, departing Fri, Nov 28 from Philadelphia to Koh Samui, returning Sun, Dec 7, priced at $1,289 found 14 hours ago
Qatar Airways
Tue, Feb 3 - Thu, Feb 26
PHL
Philadelphia
USM
Koh Samui
$1,292 Roundtrip, found 21 hours ago
$1,292
Roundtrip
found 21 hours ago
Select Qatar Airways flight, departing Tue, Feb 3 from Philadelphia to Koh Samui, returning Thu, Feb 26, priced at $1,292 found 21 hours ago
Qatar Airways
Sun, Jan 18 - Fri, Jan 30
PHL
Philadelphia
USM
Koh Samui
$1,335 Roundtrip, found 1 day ago
$1,335
Roundtrip
found 1 day ago
Select Qatar Airways flight, departing Sun, Jan 18 from Philadelphia to Koh Samui, returning Fri, Jan 30, priced at $1,335 found 1 day ago
Qatar Airways
Fri, Nov 28 - Sun, Dec 7
PHL
Philadelphia
USM
Koh Samui
$1,337 Roundtrip, found 14 hours ago
$1,337
Roundtrip
found 14 hours ago
Select Qatar Airways flight, departing Fri, Nov 28 from Philadelphia to Koh Samui, returning Sun, Dec 7, priced at $1,337 found 14 hours ago
Qatar Airways
Tue, Feb 3 - Thu, Feb 26
PHL
Philadelphia
USM
Koh Samui
$1,346 Roundtrip, found 21 hours ago
$1,346
Roundtrip
found 21 hours ago
Select Qatar Airways flight, departing Tue, Feb 3 from Philadelphia to Koh Samui, returning Thu, Feb 26, priced at $1,346 found 21 hours ago
United
Tue, Feb 3 - Thu, Feb 26
PHL
Philadelphia
USM
Koh Samui
$1,431 Roundtrip, found 21 hours ago
$1,431
Roundtrip
found 21 hours ago
Select United flight, departing Tue, Feb 3 from Philadelphia to Koh Samui, returning Thu, Feb 26, priced at $1,431 found 21 hours ago
Cathay Pacific
Thu, Jan 15 - Sat, Jan 31
PHL
Philadelphia
USM
Koh Samui
$1,612 Roundtrip, found 1 day ago
$1,612
Roundtrip
found 1 day ago
Select Cathay Pacific flight, departing Thu, Jan 15 from Philadelphia to Koh Samui, returning Sat, Jan 31, priced at $1,612 found 1 day ago
Lufthansa
Mon, May 11 - Tue, May 19
PHL
Philadelphia
USM
Koh Samui
$1,668 Roundtrip, found 1 day ago
$1,668
Roundtrip
found 1 day ago
Select Lufthansa flight, departing Mon, May 11 from Philadelphia to Koh Samui, returning Tue, May 19, priced at $1,668 found 1 day ago
British Airways
Mon, May 11 - Tue, May 19
PHL
Philadelphia
USM
Koh Samui
$1,852 Roundtrip, found 1 day ago
$1,852
Roundtrip
found 1 day ago
Select British Airways flight, departing Mon, May 11 from Philadelphia to Koh Samui, returning Tue, May 19, priced at $1,852 found 1 day ago

Frequently asked questions

How much does a flight from Philadelphia Intl. Airport (PHL) to Ko Samui Airport (USM) cost?
Lock in a cheap one-way flight from $709 or cheap return flight from $1,284 from Philadelphia Intl. Airport (PHL) to Ko Samui Airport (USM) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Philadelphia Intl. Airport (PHL) to Ko Samui Airport (USM)?
The cheapest month to fly from PHL to USM is February, when there's less demand. Off-peak months are typically when airlines offer lower prices between these airports.
How many flights per day from Philadelphia Intl. Airport (PHL) to Ko Samui Airport (USM)?
You'll have to hop on a flight with a layover if you're traveling from Philadelphia Intl. Airport (PHL) to Ko Samui Airport (USM). There are no daily direct flights on this route. However, simply filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from PHL to USM?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Just remember that flight schedules can change depending on various factors, including the carrier and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Philadelphia Intl. Airport (PHL) to Ko Samui Airport (USM)?
To avoid possible delays on the Philadelphia Intl. Airport (PHL) to Ko Samui Airport (USM) route, fly before 3 PM. Departures after this hour are 22% more likely to be canceled.**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 Philadelphia Intl. Airport (PHL) to Ko Samui Airport (USM) last-minute?
Booking your flight from PHL to USM right before your getaway is typically more expensive. However, if there's some wiggle room with your travel times and dates, you could score a cheap last-minute fare.
Is it cheaper to book a PHL to USM flight and hotel package?
You'll generally save money by booking a PHL to USM flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one convenient place. Once you've chosen your preferred accommodations and flights, consider adding extras such as tours, car rentals and activities.
Can I cancel or change the date of my flight from Philadelphia Intl. Airport (PHL) to Ko Samui Airport (USM)?
If you reserved your PHL to USM flight in the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the type of fare you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you want more information.

Travel information

Origin airport
Philadelphia Intl.
Destination airport
Samui Intl. Airport
Airlines serving
British Airways, Cathay Pacific, Lufthansa, Qatar Airways
Roundtrip price
$1,283
Distance
9008 mi

Book with confidence

Philadelphia to Samui Intl. Airport Flights

The cheapest times to fly from Philadelphia 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 Philadelphia to Samui Intl. Airport are during the month of February. You can find some of the cheapest flights from Philadelphia to Samui Intl. Airport with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Philadelphia 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 Philadelphia 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 Philadelphia to Samui Intl. Airport in 2025. You can also book with separate airlines for your outbound and return journeys, from $709 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 Philadelphia 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 Philadelphia 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.

 

Philadelphia to Samui Intl. Airport Flights
*Available to One Key members.