$847 Cheap Flights from Baltimore (BWI) to Samui Intl. Airport (USM)

View $847 flight on Sun, Apr 19, 2026Opens in a new window

Popular airlines from Baltimore Washington Intl. Airport (BWI) to Samui Intl. Airport (USM)

Cheap Flights from Baltimore to Samui Intl. Airport (BWI-USM)

Prices were available within the past 7 days and start at $847 for one-way flights and $1,453 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, Mar 8 - Tue, Mar 17
BWI
Baltimore
USM
Koh Samui
$1,453 Roundtrip, found 2 hours ago
$1,453
Roundtrip
found 2 hours ago
Select United flight, departing Sun, Mar 8 from Baltimore to Koh Samui, returning Tue, Mar 17, priced at $1,453 found 2 hours ago
United
Sun, Mar 8 - Tue, Mar 17
BWI
Baltimore
USM
Koh Samui
$1,453 Roundtrip, found 2 hours ago
$1,453
Roundtrip
found 2 hours ago
Select United flight, departing Sun, Mar 8 from Baltimore to Koh Samui, returning Tue, Mar 17, priced at $1,453 found 2 hours ago
United
Sun, Mar 8 - Tue, Mar 17
BWI
Baltimore
USM
Koh Samui
$1,466 Roundtrip, found 2 hours ago
$1,466
Roundtrip
found 2 hours ago
Select United flight, departing Sun, Mar 8 from Baltimore to Koh Samui, returning Tue, Mar 17, priced at $1,466 found 2 hours ago
United
Sun, Mar 8 - Tue, Mar 17
BWI
Baltimore
USM
Koh Samui
$1,471 Roundtrip, found 2 hours ago
$1,471
Roundtrip
found 2 hours ago
Select United flight, departing Sun, Mar 8 from Baltimore to Koh Samui, returning Tue, Mar 17, priced at $1,471 found 2 hours ago
United
Sun, Mar 8 - Tue, Mar 17
BWI
Baltimore
USM
Koh Samui
$1,473 Roundtrip, found 2 hours ago
$1,473
Roundtrip
found 2 hours ago
Select United flight, departing Sun, Mar 8 from Baltimore to Koh Samui, returning Tue, Mar 17, priced at $1,473 found 2 hours ago
United
Sun, Mar 8 - Tue, Mar 17
BWI
Baltimore
USM
Koh Samui
$1,473 Roundtrip, found 2 hours ago
$1,473
Roundtrip
found 2 hours ago
Select United flight, departing Sun, Mar 8 from Baltimore to Koh Samui, returning Tue, Mar 17, priced at $1,473 found 2 hours ago
United
Sun, Mar 8 - Tue, Mar 17
BWI
Baltimore
USM
Koh Samui
$1,480 Roundtrip, found 2 hours ago
$1,480
Roundtrip
found 2 hours ago
Select United flight, departing Sun, Mar 8 from Baltimore to Koh Samui, returning Tue, Mar 17, priced at $1,480 found 2 hours ago
United
Sun, Mar 8 - Tue, Mar 17
BWI
Baltimore
USM
Koh Samui
$1,485 Roundtrip, found 2 hours ago
$1,485
Roundtrip
found 2 hours ago
Select United flight, departing Sun, Mar 8 from Baltimore to Koh Samui, returning Tue, Mar 17, priced at $1,485 found 2 hours ago
British Airways
Fri, Nov 28 - Sat, Dec 13
BWI
Baltimore
USM
Koh Samui
$2,568 Roundtrip, found 3 days ago
$2,568
Roundtrip
found 3 days ago
Select British Airways flight, departing Fri, Nov 28 from Baltimore to Koh Samui, returning Sat, Dec 13, priced at $2,568 found 3 days ago
Cathay Pacific
Sun, Jan 4 - Wed, Jan 7
BWI
Baltimore
USM
Koh Samui
$7,302 Roundtrip, found 3 hours ago
$7,302
Roundtrip
found 3 hours ago
Select Cathay Pacific flight, departing Sun, Jan 4 from Baltimore to Koh Samui, returning Wed, Jan 7, priced at $7,302 found 3 hours ago

Frequently asked questions

How much does a flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Ko Samui Airport (USM) cost?
Get a cheap one-way flight from $847 or cheap return flight from $1,453 from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) 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 Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Ko Samui Airport (USM)?
March is the cheapest month to fly from BWI to USM. Traveling outside of peak seasons is often the key to landing a great deal.
What is the cheapest airline that flies from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Ko Samui Airport (USM)?
To find the cheapest airline flying from BWI to USM, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Ko Samui Airport (USM)?
There aren't any daily nonstop flights departing from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Ko Samui Airport (USM). But you can book flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be cruising above the clouds in no time at all.
What day of the week has the most flights from BWI to USM?
Generally you'll find the greatest selection of flight options on a Friday. Tuesdays are often the quietest.* However, this can change depending 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 Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Ko Samui Airport (USM)?
To avoid potential delays on the Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Ko Samui Airport (USM) route, travel before 3 PM. Departures after this time 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 Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Ko Samui Airport (USM) last-minute?
Waiting until just before your trip to book a flight from BWI to USM often results in higher prices. While you may come across some last-minute deals, there's no guarantee. Be flexible with your travel plans to boost your chances of snagging a bargain.
Is it cheaper to book a BWI to USM flight and hotel package?
Booking a BWI to USM flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels in one place. Pick from our extensive range of hotels and then add activities, car rentals and flights 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 Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Ko Samui Airport (USM)?
You can usually reschedule or cancel your BWI 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 allowed and if any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Samui Intl. Airport
Airlines serving
British Airways, Cathay Pacific
Roundtrip price
$1,452
Distance
9062 mi

Book with confidence

Baltimore to Samui Intl. Airport Flights

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

 

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

Sunday is one of the best days to book for cheap flights from Baltimore 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 Baltimore 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 Baltimore to Samui Intl. Airport in 2025. You can also book with separate airlines for your outbound and return journeys, from $847 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 Baltimore 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 Baltimore 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.

 

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