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DENVER — Denver International Airport is adding to its growing list of international cities. Nonstop seasonal flights from Denver to Belize City will start in March, Southwest Airlines and DIA announced Thursday.

Southwest Airlines will operate the new service once per week, on Saturdays, during the peak season for travel to Belize from March 11 through April 22.

The flight is scheduled to depart DIA at 10:30 a.m., arriving in Belize City at 2:50 p.m.

The airport said with the addition of Belize City, DIA now has service to 20 international destinations in eight countries, and more than 170 nonstop destinations.

The new service starts March 11.