Southwest Readies Sonoma Launch as STS Traffic Dips 7.5%
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Sonoma County Airport's February passenger traffic dipped 7.5% year-over-year as it prepares for Southwest Airlines' new service starting April 7th.
Key Takeaways
- •Posted 45,804 passengers in February, a 7.5% year-over-year decline.
- •Prepares for Southwest Airlines' inaugural service to four cities on April 7, 2026.
- •Projects $819,834 in new revenue from an updated Master Fee Schedule for FY25-26.
Charles M. Schulz–Sonoma County Airport (STS) is preparing for the launch of Southwest Airlines service in April after passenger traffic saw a year-over-year decline in February. The airport handled 45,804 passengers during the month, a decrease of approximately 7.5% compared to the previous year, setting the stage for a significant shift in market dynamics with the arrival of the major low-cost carrier.
The February figures reflect a transitional period for the Santa Rosa airport, following the departure of Avelo Airlines from its West Coast operations in August 2025. This move created a capacity void that legacy carriers have partially filled, but the introduction of Southwest Airlines is widely anticipated to fundamentally alter passenger volumes, airport revenue, and the competitive landscape for flights into California's Wine Country. Airport officials expect the first clear data on this impact to emerge in May 2026.
February Traffic Breakdown
According to passenger data released by Charles M. Schulz–Sonoma County Airport, the 45,804 passengers in February followed a total of 47,201 in January, bringing the year-to-date count to 93,005. While the overall traffic was down, incumbent carriers saw notable gains. Alaska Airlines was the dominant operator, carrying 38,924 passengers, which represents a 21.4% year-over-year increase. American Airlines also saw a modest rise, handling 6,880 passengers for a 5.6% year-over-year gain. These increases, however, were insufficient to offset the capacity lost from Avelo's exit.
Southwest's Imminent Arrival
Southwest Airlines has confirmed its service will begin on April 7, 2026. The initial schedule includes nonstop flights to four key destinations: Hollywood Burbank Airport (BUR), San Diego International Airport (SAN), Harry Reid International Airport (LAS) in Las Vegas, and Denver International Airport (DEN). According to the airline, service to San Diego and Las Vegas will operate daily, while the Burbank route will begin with five flights per week. Service to Denver is slated for Saturdays only at launch. Southwest Airlines Chief Operating Officer Andrew Watterson stated that adding STS provides greater access to the region and reinforces the carrier's commitment to intra-California service.
Financial Adjustments and Revenue Impact
In preparation for the operational shift, Sonoma County has updated the airport's Master Fee Schedule. According to agenda materials from the Sonoma County Board of Supervisors, the revised schedule for fiscal year 2025-26 adjusts fees for aircraft storage, landing, ground leases, and vehicle parking. The county estimates that these changes will generate approximately $819,834 in additional annual revenue for the airport. This financial restructuring is expected to capitalize on the anticipated increase in passenger flow driven by Southwest's daily operations, directly impacting revenue for airport concessionaires and parking services.
Market Dynamics and Competitive Landscape
The arrival of Southwest marks a significant development in the trend of low-cost carrier network restructuring at regional airports. It directly backfills the capacity left by Avelo Airlines, which ceased its West Coast operations and abandoned its STS hub in 2025. In the interim, legacy carriers like Alaska Airlines capitalized on the reduced competition, as evidenced by its substantial traffic growth.
However, Southwest's entry introduces direct competition for Alaska on key routes to Burbank and San Diego. This will likely impact Alaska's market share and fare structures at STS. For the broader Sonoma County region, the new service is expected to be a boon for tourism and hospitality, providing daily, direct access from major metropolitan areas.
What Comes Next
The first key milestone is the inaugural flight of Southwest Airlines at STS, confirmed for April 7, 2026. Following the launch, the next critical data point will be the publication of the airport's April 2026 passenger statistics, which is expected in May 2026. According to Airport Manager Jon Stout, this report will offer the first concrete evidence of Southwest's impact. Stout noted the contrast between Southwest's seven-day-a-week operational model and Avelo's previous two-day-a-week schedule, suggesting a more substantial and consistent effect on passenger numbers and ancillary revenues.
Why This Matters
Southwest Airlines' expansion into Sonoma County is a strategic move that highlights the growing importance of secondary airports in leisure travel markets. For the industry, it demonstrates how major low-cost carriers are selectively backfilling routes abandoned by smaller operators to capture underserved demand. This development positions STS for significant growth in passenger traffic and revenue, while intensifying competition for incumbent airlines and signaling a new phase of network evolution in the California aviation market.
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Written by Hardik Vishwakarma
Co-Founder & Aviation News Editor leading initiatives that improve trust and visibility across the global aviation industry. Covers airlines, airports, safety, and emerging technology.
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