$488 Cheap Flights from Houston (IAH) to Samui Intl. Airport (USM)

View $488 flight on Thu, Oct 9, 2025Opens in a new window

Popular airlines from George Bush Intercontinental Airport (IAH) to Samui Intl. Airport (USM)

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Cheap Flights from Houston to Samui Intl. Airport (IAH-USM)

Prices were available within the past 7 days and start at $488 for one-way flights and $882 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Oct 20 - Mon, Oct 27
IAH
Houston
USM
Koh Samui
$882 Roundtrip, found 19 hours ago
$882
Roundtrip
found 19 hours ago
Select United flight, departing Mon, Oct 20 from Houston to Koh Samui, returning Mon, Oct 27, priced at $882 found 19 hours ago
United
Sun, Apr 26 - Sun, May 3
IAH
Houston
USM
Koh Samui
$887 Roundtrip, found 1 day ago
$887
Roundtrip
found 1 day ago
Select United flight, departing Sun, Apr 26 from Houston to Koh Samui, returning Sun, May 3, priced at $887 found 1 day ago
United
Mon, Oct 20 - Mon, Oct 27
IAH
Houston
USM
Koh Samui
$890 Roundtrip, found 19 hours ago
$890
Roundtrip
found 19 hours ago
Select United flight, departing Mon, Oct 20 from Houston to Koh Samui, returning Mon, Oct 27, priced at $890 found 19 hours ago
United
Wed, Oct 8 - Sun, Oct 12
IAH
Houston
USM
Koh Samui
$893 Roundtrip, found 1 day ago
$893
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 8 from Houston to Koh Samui, returning Sun, Oct 12, priced at $893 found 1 day ago
United
Mon, Oct 20 - Mon, Oct 27
IAH
Houston
USM
Koh Samui
$901 Roundtrip, found 19 hours ago
$901
Roundtrip
found 19 hours ago
Select United flight, departing Mon, Oct 20 from Houston to Koh Samui, returning Mon, Oct 27, priced at $901 found 19 hours ago
United
Mon, Oct 20 - Mon, Oct 27
IAH
Houston
USM
Koh Samui
$909 Roundtrip, found 19 hours ago
$909
Roundtrip
found 19 hours ago
Select United flight, departing Mon, Oct 20 from Houston to Koh Samui, returning Mon, Oct 27, priced at $909 found 19 hours ago
EVA Airways
Mon, Sep 22 - Tue, Sep 30
IAH
Houston
USM
Koh Samui
$1,183 Roundtrip, found 5 days ago
$1,183
Roundtrip
found 5 days ago
Select EVA Airways flight, departing Mon, Sep 22 from Houston to Koh Samui, returning Tue, Sep 30, priced at $1,183 found 5 days ago
Turkish Airlines
Tue, Nov 25 - Thu, Dec 4
IAH
Houston
USM
Koh Samui
$1,196 Roundtrip, found 7 hours ago
$1,196
Roundtrip
found 7 hours ago
Select Turkish Airlines flight, departing Tue, Nov 25 from Houston to Koh Samui, returning Thu, Dec 4, priced at $1,196 found 7 hours ago
Qatar Airways
Thu, Oct 2 - Fri, Oct 24
IAH
Houston
USM
Koh Samui
$1,410 Roundtrip, found 2 days ago
$1,410
Roundtrip
found 2 days ago
Select Qatar Airways flight, departing Thu, Oct 2 from Houston to Koh Samui, returning Fri, Oct 24, priced at $1,410 found 2 days ago
Cathay Pacific
Sun, Oct 12 - Sun, Oct 19
IAH
Houston
USM
Koh Samui
$1,650 Roundtrip, found 1 day ago
$1,650
Roundtrip
found 1 day ago
Select Cathay Pacific flight, departing Sun, Oct 12 from Houston to Koh Samui, returning Sun, Oct 19, priced at $1,650 found 1 day ago
Flights from Houston (IAH) to Samui Intl. Airport (USM)
Origin airport
George Bush Intercontinental
Destination airport
Samui Intl. Airport
Airlines serving
Air France, British Airways, Cathay Pacific, EVA Airways, KLM, Lufthansa, Qatar Airways, Turkish Airlines
Roundtrip price
$881
Distance
9519 mi

Houston to Samui Intl. Airport Flights

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

 

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

Sunday is one of the best days to book for cheap flights from Houston 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 Houston 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 Houston to Samui Intl. Airport in 2025. You can also book with separate airlines for your outbound and return journeys, from $488 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 Houston 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 Houston 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 George Bush Intercontinental Airport (IAH) to Ko Samui Airport (USM) cost?
Snag a cheap one-way flight from $488 or cheap return flight from $882 from George Bush Intercontinental Airport (IAH) to Ko Samui Airport (USM) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from George Bush Intercontinental Airport (IAH) to Ko Samui Airport (USM)?
October is the cheapest month to fly from IAH to USM. Avoiding peak travel times is often the key to finding better deals on flights.
What is the cheapest airline that flies from George Bush Intercontinental Airport (IAH) to Ko Samui Airport (USM)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest IAH to USM flight.
How many flights per day from George Bush Intercontinental Airport (IAH) to Ko Samui Airport (USM)?
You'll have to take a flight with a layover when traveling from George Bush Intercontinental Airport (IAH) to Ko Samui Airport (USM). There are no daily direct flights on this route. However, simply filter your search to include one or more stops to find an option that works for you.
What day of the week has the most flights from IAH to USM?
Usually you'll find the most flight options available on a Friday. Tuesdays tend to be the quietest.* But this can vary depending on the season, carrier 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 George Bush Intercontinental Airport (IAH) to Ko Samui Airport (USM)?
Choose a flight from George Bush Intercontinental Airport (IAH) to Ko Samui Airport (USM) that leaves before 3 PM to reduce the risk of delays and cancellations. Departures after this time are on average 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 George Bush Intercontinental Airport (IAH) to Ko Samui Airport (USM) last-minute?
Waiting until just before your departure to book a ticket from IAH to USM often results in higher prices. While you may find some last-minute discounts, there's no guarantee. Be flexible with your itinerary for a better chance of getting a bargain.
Is it cheaper to book an IAH to USM flight and hotel package?
Compared with arranging flights and hotels separately, booking an IAH to USM flight and hotel package with Expedia could result in significant savings. Better yet, having everything in one easy place will take the stress out of planning your trip. Simply secure your flights and choose from our extensive range of hotels, then personalize your trip with other add-ons like tours and car rentals.
Can I cancel or change the date of my flight from George Bush Intercontinental Airport (IAH) to Ko Samui Airport (USM)?
It's usually possible to reschedule or cancel your IAH to USM flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.