Alaska Airlines' Santa Rosa ridership last month hit an all-time high for January, when 14,680 passengers flew to and from Charles M. Schulz-Sonoma County Airport.
Traffic rose 2 percent in January, compared to a year ago. Alaska flights averaged 71 percent full, according to airport officials.
The Seattle-based carrier offers five trips a day from Santa Rosa to Los Angeles, Seattle, Portland and Las Vegas.
In June, it will drop its Las Vegas route and add daily service to San Diego. Alaska also is planning a third daily flight from Santa Rosa to Los Angeles for the summer season.
The flights are operated by Alaska's sister carrier, Horizon Air, using Q400 turboprop aircraft that carry 76 passengers. Ticketing, pricing, marketing and scheduling are handled by Alaska.
Both carriers are part of Alaska Air Group.