$542 Cheap Flights from Denver (DEN) to Samui Intl. Airport (USM)

View $542 flight on Sun, Sep 7, 2025Opens in a new window

Popular airlines from Denver Intl. Airport (DEN) to Samui Intl. Airport (USM)

Cheap Flights from Denver to Samui Intl. Airport (DEN-USM)

Prices were available within the past 7 days and start at $542 for one-way flights and $931 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Oct 1 - Wed, Oct 8
DEN
Denver
USM
Koh Samui
$931 Roundtrip, found 3 days ago
$931
Roundtrip
found 3 days ago
Select United flight, departing Wed, Oct 1 from Denver to Koh Samui, returning Wed, Oct 8, priced at $931 found 3 days ago
United
Wed, Apr 29 - Mon, May 25
DEN
Denver
USM
Koh Samui
$936 Roundtrip, found 3 days ago
$936
Roundtrip
found 3 days ago
Select United flight, departing Wed, Apr 29 from Denver to Koh Samui, returning Mon, May 25, priced at $936 found 3 days ago
United
Wed, Oct 1 - Wed, Oct 8
DEN
Denver
USM
Koh Samui
$938 Roundtrip, found 3 days ago
$938
Roundtrip
found 3 days ago
Select United flight, departing Wed, Oct 1 from Denver to Koh Samui, returning Wed, Oct 8, priced at $938 found 3 days ago
United
Wed, Oct 1 - Wed, Oct 8
DEN
Denver
USM
Koh Samui
$939 Roundtrip, found 3 days ago
$939
Roundtrip
found 3 days ago
Select United flight, departing Wed, Oct 1 from Denver to Koh Samui, returning Wed, Oct 8, priced at $939 found 3 days ago
United
Wed, Oct 1 - Wed, Oct 8
DEN
Denver
USM
Koh Samui
$942 Roundtrip, found 3 days ago
$942
Roundtrip
found 3 days ago
Select United flight, departing Wed, Oct 1 from Denver to Koh Samui, returning Wed, Oct 8, priced at $942 found 3 days ago
United
Tue, Sep 23 - Tue, Sep 30
DEN
Denver
USM
Koh Samui
$942 Roundtrip, found 12 hours ago
$942
Roundtrip
found 12 hours ago
Select United flight, departing Tue, Sep 23 from Denver to Koh Samui, returning Tue, Sep 30, priced at $942 found 12 hours ago
Lufthansa
Mon, Nov 17 - Mon, Dec 1
DEN
Denver
USM
Koh Samui
$1,728 Roundtrip, found 5 days ago
$1,728
Roundtrip
found 5 days ago
Select Lufthansa flight, departing Mon, Nov 17 from Denver to Koh Samui, returning Mon, Dec 1, priced at $1,728 found 5 days ago
Singapore Airlines
Sat, Jan 24 - Sat, Feb 7
DEN
Denver
USM
Koh Samui
$1,804 Roundtrip, found 23 hours ago
$1,804
Roundtrip
found 23 hours ago
Select Singapore Airlines flight, departing Sat, Jan 24 from Denver to Koh Samui, returning Sat, Feb 7, priced at $1,804 found 23 hours ago
Air France
Sun, Sep 7 - Mon, Sep 29
DEN
Denver
USM
Koh Samui
$1,828 Roundtrip, found 1 day ago
$1,828
Roundtrip
found 1 day ago
Select Air France flight, departing Sun, Sep 7 from Denver to Koh Samui, returning Mon, Sep 29, priced at $1,828 found 1 day ago
KLM
Sun, Sep 7 - Mon, Sep 29
DEN
Denver
USM
Koh Samui
$1,838 Roundtrip, found 1 day ago
$1,838
Roundtrip
found 1 day ago
Select KLM flight, departing Sun, Sep 7 from Denver to Koh Samui, returning Mon, Sep 29, priced at $1,838 found 1 day ago
Flights from Denver (DEN) to Samui Intl. Airport (USM)
Origin airport
Denver Intl.
Destination airport
Samui Intl. Airport
Airlines serving
Air France, British Airways, KLM, Lufthansa, Singapore Airlines
Roundtrip price
$931
Distance
8673 mi

Denver to Samui Intl. Airport Flights

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

 

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

Sunday is one of the best days to book for cheap flights from Denver 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 Denver 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 Denver to Samui Intl. Airport in 2025. You can also book with separate airlines for your outbound and return journeys, from $542 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 Denver 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 Denver 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 Denver Intl. Airport (DEN) to Ko Samui Airport (USM) cost?
Lock in a cheap one-way flight from $542 or cheap return flight from $931 from Denver Intl. Airport (DEN) 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 Denver Intl. Airport (DEN) to Ko Samui Airport (USM)?
Traveling in October is a great way to save, as it's the cheapest month for flights between DEN and USM. You'll usually find the lowest prices during the off-season.
What is the cheapest airline that flies from Denver Intl. Airport (DEN) to Ko Samui Airport (USM)?
To find the cheapest airline flying from DEN to USM, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
How many flights per day from Denver Intl. Airport (DEN) to Ko Samui Airport (USM)?
Nonstop flights from Denver Intl. Airport (DEN) 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 filters. Enter your dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from DEN to USM?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can vary depending on a number of factors, including the airline 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 Denver Intl. Airport (DEN) to Ko Samui Airport (USM)?
Book a flight from Denver Intl. Airport (DEN) to Ko Samui Airport (USM) that leaves before 3 PM to reduce the risk of cancellations and delays. Later departures have a 22% higher chance of being canceled, on average.**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 Denver Intl. Airport (DEN) to Ko Samui Airport (USM) last-minute?
Booking your flight from DEN to USM just before your getaway is generally more expensive. However, if there's some wiggle room with your departure dates and times, you could snag a cheap last-minute fare.
Is it cheaper to book a DEN to USM flight and hotel package?
You'll generally save money by securing a DEN to USM flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one convenient place. After choosing your preferred flights and accommodations, you can add extras like activities, car rentals and tours.
Can I cancel or change the date of my flight from Denver Intl. Airport (DEN) to Ko Samui Airport (USM)?
Usually, it's possible to reschedule or cancel your DEN to USM flight. However, for bookings made more than 24 hours ago, additional fees may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.