Passenger boardings on the two commercial airlines serving Pierre increased 9 percent in 2010 to 14,824.
Airport manager Mike Isaacs says the number likely would have topped 15,000 if not for 21 flight cancellations in December - mostly because of bad weather.
Delta Airlines links Pierre with Minneapolis. Great Lakes Aviation connects with Denver.
Construction will start this year on a new airport terminal at Pierre. Completion is expected in 2012.