Alaska Airline's Santa Rosa ridership rose 2.4 percent in June as the carrier began new service to San Diego from the Charles M. Schulz-Sonoma County Airport.
Ridership reached 19,060 last month, up from 18,620 a year earlier, airport manager Jon Stout said Tuesday.
Alaska last month dropped its Santa Rosa-to-Las Vegas service and began daily flights to San Diego. It added a third flight to Los Angeles four days a week through Aug. 25, in addition to daily flights to Portland and Seattle.
June flights were 77 percent full, compared with 81 percent a year ago.
For the first six months of the year, ridership totaled 99,147, up 1.5 percent for the same period in 2011.
The six daily passenger flights are operated by Horizon Air, Alaska's sister carrier, which began service to Santa Rosa in 2007.
Alaska handles scheduling, ticketing, pricing and marketing. The airlines are part of Seattle-based Alaska Air Group.