$578 Cheap Flights from Louisville (SDF) to Samui Intl. Airport (USM)

View $578 flight on Mon, Nov 10, 2025Opens in a new window

Popular airlines from Louisville Intl. Airport (SDF) to Samui Intl. Airport (USM)

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Cheap Flights from Louisville to Samui Intl. Airport (SDF-USM)

Prices were available within the past 7 days and start at $578 for one-way flights and $1,413 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,413 Roundtrip, found 5 days ago
$1,413
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,413 found 5 days ago
American Airlines
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,419 Roundtrip, found 5 days ago
$1,419
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,419 found 5 days ago
American Airlines
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,419 Roundtrip, found 5 days ago
$1,419
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,419 found 5 days ago
American Airlines
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,421 Roundtrip, found 5 days ago
$1,421
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,421 found 5 days ago
American Airlines
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,425 Roundtrip, found 5 days ago
$1,425
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,425 found 5 days ago
American Airlines
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,427 Roundtrip, found 5 days ago
$1,427
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,427 found 5 days ago
American Airlines
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,605 Roundtrip, found 5 days ago
$1,605
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,605 found 5 days ago
American Airlines
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,611 Roundtrip, found 5 days ago
$1,611
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,611 found 5 days ago
American Airlines
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,613 Roundtrip, found 5 days ago
$1,613
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,613 found 5 days ago
American Airlines
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,618 Roundtrip, found 5 days ago
$1,618
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,618 found 5 days ago
American Airlines
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,620 Roundtrip, found 5 days ago
$1,620
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,620 found 5 days ago
United
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,682 Roundtrip, found 5 days ago
$1,682
Roundtrip
found 5 days ago
Select United flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,682 found 5 days ago
United
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,847 Roundtrip, found 5 days ago
$1,847
Roundtrip
found 5 days ago
Select United flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,847 found 5 days ago
United
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,849 Roundtrip, found 5 days ago
$1,849
Roundtrip
found 5 days ago
Select United flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,849 found 5 days ago
American Airlines
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,854 Roundtrip, found 5 days ago
$1,854
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,854 found 5 days ago
American Airlines
Mon, Nov 10 - Fri, Nov 21
SDF
Louisville
USM
Koh Samui
$1,857 Roundtrip, found 5 days ago
$1,857
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Nov 10 from Louisville to Koh Samui, returning Fri, Nov 21, priced at $1,857 found 5 days ago

Frequently asked questions

How much does a flight from Louisville Intl. Airport (SDF) to Ko Samui Airport (USM) cost?
Lock in a cheap one-way flight from $578 or cheap return flight from $1,413 from Louisville Intl. Airport (SDF) to Ko Samui Airport (USM) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Louisville Intl. Airport (SDF) to Ko Samui Airport (USM)?
November is the cheapest month to fly from SDF to USM. Traveling outside of peak seasons is often the key to finding better deals on flights.
What is the cheapest airline that flies from Louisville Intl. Airport (SDF) to Ko Samui Airport (USM)?
Use the filters on Expedia to compare airlines and find the cheapest carrier that'll take you from SDF to USM. Then, sort your results by "Price (lowest to highest)" to score a great deal.
How many flights per day from Louisville Intl. Airport (SDF) to Ko Samui Airport (USM)?
Direct flights from Louisville Intl. Airport (SDF) to Ko Samui Airport (USM) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SDF to USM?
Typically you'll find the greatest selection of flight options on a Friday. Tuesdays are often the quietest.* However, this can change based on the time of year, airline 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 Louisville Intl. Airport (SDF) to Ko Samui Airport (USM)?
To arrive at Ko Samui Airport (USM) without delays, pick a flight that leaves Louisville Intl. Airport (SDF) before 3 PM. The chance 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 Louisville Intl. Airport (SDF) to Ko Samui Airport (USM) last-minute?
Booking your ticket from SDF to USM shortly before your getaway is usually more expensive. However, if there's some wiggle room with your schedule, you could land a cheap last-minute fare.
Is it cheaper to book a SDF to USM flight and hotel package?
Booking a SDF to USM flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels all in one place. Select from our impressive range of hotels and then add flights, activities and car rentals to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Louisville Intl. Airport (SDF) to Ko Samui Airport (USM)?
Typically, it's possible to reschedule or cancel your SDF to USM flight. However, for bookings made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Origin airport
Louisville Intl.
Destination airport
Samui Intl. Airport
Roundtrip price
$1,412
Distance
9116 mi

Book with confidence

Louisville to Samui Intl. Airport Flights

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

 

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

Sunday is one of the best days to book for cheap flights from Louisville 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 Louisville 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 Louisville to Samui Intl. Airport in 2025. You can also book with separate airlines for your outbound and return journeys, from $578 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 Louisville 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 Louisville 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.

 

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