There are several numbers to call if you lose an item at Sonoma County Airport:
Alaska / Horizon's local baggage and message line: (707) 543-7100
Airport Manager's Office Lost and Found: (707) 565-7243
Lost in the Sky Lounge Steakhouse Restaurant: (707) 542-9400
Lost in a parking lot - Republic Parking (707) 523-2186
To locate items left onboard a Horizon Air or Alaska Airlines flight, fill out this online form (preferred method).
Alaska Airlines / Horizon Air's lost baggage line is 1-877-815-8253 , or online at Baggage Services.
For questions about baggage inspected by Security, call 1-866-289-9673.