The cheapest times to fly from USM to BWI are

  • January 15th to April 8th (except the weeks of February 19th and February 26th)
  • June 11th to July 8th
  • October 8th to November 11th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from USM to BWI is late October to early November. Prices can be as high as $4941 for Friday flights during late December, or as low as $1379 for Tuesday flights around late October to early November.


When to Fly to Baltimore

Flying from Koh Samui (USM) to Baltimore, MD (BWI) will usually cost between $1645 to $2415 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late October to early November with an average ticket price of $1592. Due to high demand the most expensive time to fly is late December, with an average price of $3459. Planning your trip to low-cost times can easily save you $1867 on economy flights and even more on first-class flights. Generally, any price below $1803 can be considered a good price for a round-trip USM to BWI flight.

See below for a graph of average weekly prices for the USM to BWI route. All prices are for round-trip tickets in USD.

USM to BWI Flight Prices

Compared to other flights, the USM to BWI flight is more expensive than the average and costs slightly more than the average flight leaving from Ko Samui. The average price per mile (for a direct flight) is $0.12, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to fly to BWI, and Monday the cheapest day to fly back into USM. Fridays are the most expensive days to fly to Baltimore, and Tuesdays are the most expensive days to return to Ko Samui. Selecting flights on the least expensive days could save you up to $332 (9%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $1789. Return trip prices are from the BWI to USM flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from USM to BWI can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 17 hour 18 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from USM to BWI while comparing.

Destination alternative #1: Washington Dulles International Airport (IAD) in Washington, DC

  • 45 miles (72 km) away from BWI
  • Usually 1.50% less expensive than BWI
  • 1-layover flights available

See USM to IAD flights


Flight Hacking USM to BWI

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from USM to BWI — but Champion Traveler does!

Hack #1: Los Angeles, CA (USM > LAX > BWI)

  • Price for both tickets: $1404
  • Average savings: $400 (22.16%)

See USM to SIN flights

Hack #2: Singapore (USM > SIN > BWI)

  • Price for both tickets: $1414
  • Average savings: $389 (21.58%)

See USM to LAX flights

Hack #3: Hong Kong (USM > HKG > BWI)

  • Price for both tickets: $1441
  • Average savings: $362 (20.08%)

See USM to HKG flights


Flight Questions Answered

Still have questions about flying from USM to BWI? We’ve got answers.

Which airlines fly this route?

You can find 24 major airlines flying this route most often: Aeroflot, Air Canada, Alaska, American, ANA, Austrian, Bangkok Airways, British Airways, Cathay Pacific, China Southern, Delta, Etihad, Fiji Airways, Finnair, Hainan, JetBlue, Kenya Airways, KLM, Lufthansa, Qatar Airways, Singapore Airlines, SWISS, United, Xiamen, and potentially more during busy seasons.

How far away is it from Baltimore/Washington International Thurgood Marshall Airport to Samui Airport?

The distance between the two airports is roughly 9062 miles or 14584 kilometers.

How long does it take to fly from USM to BWI?

The real-world flight time for a nonstop USM to BWI flight is about 17 hour 18 minutes.

How many flights go between Koh Samui and Baltimore, MD?

It depends on the day of the week and the date, but a typical day might have around 45 available flights from USM to BWI.


Airport Location Info


Departing Airport

Origination code USM
Origination airport name Samui Airport
City Koh Samui
Country Thailand
Latitude 9.5
Longitude 100.1

Return Airport

Destination code BWI
Destination airport name Baltimore/Washington International Thurgood Marshall Airport
City Baltimore, MD
Country the United States
Latitude 39.2
Longitude -76.7


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.