Sonoma County travelers looking for cheaper, more direct flights got early confirmation this week that Southwest Airlines is making a strong run at their local airport — and the carrier is already adding more flights to meet demand.
Key Takeaways
- Southwest Airlines launched service at Charles M. Schulz-Sonoma County Airport on April 7, with nonstop routes to San Diego, Las Vegas, Burbank, and Denver.
- The airline averaged about 75% capacity across all routes in its first week of operations, which airport officials called a solid result.
- Southwest has already announced it will expand Denver service from one day per week to five days per week, effective August 26.
- A new seasonal Saturday service to Austin, Texas is set to launch October 3.
- Airport officials expect April passenger totals to surge roughly 30% year-over-year now that Southwest is flying.
Southwest takes flight with strong early numbers
Southwest Airlines touched down at Santa Rosa’s Charles M. Schulz-Sonoma County Airport (STS) on April 7, marking the first time the low-cost carrier has offered service there. According to the Press Democrat, Southwest’s planes averaged about 75% capacity across all routes in the inaugural week — including the Denver run, which many observers expected to be the slowest to fill. Airport manager Jon Stout said the result exceeded early expectations. “Given that they’ve only been operating about a week, that’s doing pretty good,” Stout told the Press Democrat. Southwest’s signature perks — no checked-bag fees and generally lower base fares than legacy carriers — have long made it a favorite among budget-conscious travelers, and the launch gives Sonoma County residents a new option without driving to Oakland or San Francisco.
More routes, more frequency already confirmed
The strong opening numbers have already translated into expanded service. Southwest confirmed it will grow Denver flights from one day per week to five days per week, with that expansion taking effect August 26. The airline will also launch seasonal Saturday nonstop service to Austin, Texas starting October 3 — giving Sonoma County travelers a direct connection to the Texas capital that previously required a connection through a Bay Area hub. The Austin route runs on a seasonal basis, though Southwest has not said when it will end for the season. The rapid service additions suggest the airline views STS as a growth market worth investing in early.
What the passenger numbers tell us
March figures released by the airport — covering the month before Southwest launched — showed 61,422 total passengers, down 5.9% from March 2025, a decline officials largely attribute to Avelo Airlines exiting the airport last August. Alaska Airlines, the airport’s largest carrier, posted a robust 80% load factor in March carrying 52,775 passengers, while American Airlines carried 8,647 passengers at a 92% load factor. With Southwest now in the mix, airport officials expect April data to show a year-over-year increase of roughly 30%.
The timing matters for the broader local economy. As Sonoma County works through significant budget pressures from federal cuts and state shortfalls, expanded air service represents one concrete source of economic activity — bringing visitors to the county’s wine country and giving local businesses easier access to markets in Denver, Las Vegas, San Diego, Burbank, and eventually Austin. The airport has been a quiet success story in recent years, finishing 2025 with record annual passenger numbers before Avelo’s departure created a temporary dip. Southwest’s strong debut suggests the airport may soon set new records again.
Frequently Asked Questions
Which cities can I fly nonstop from Sonoma County now that Southwest is here?
As of April 2026, Southwest Airlines offers nonstop flights from Charles M. Schulz-Sonoma County Airport to San Diego, Las Vegas, Burbank, and Denver. Alaska Airlines and American Airlines also serve the airport with their own nonstop destinations, giving travelers a range of options without driving to Oakland or SFO.
Will Southwest’s entry lower fares from the Sonoma County airport?
Quite possibly. Southwest is known for lower base fares and its no-fee checked-bag policy, which differs from both Alaska and American. Economists generally expect low-cost carriers to push fares down on routes where they compete with legacy carriers, though the actual impact depends on how aggressively Southwest prices its Sonoma County routes going forward.
When do the new Denver and Austin flights start?
Southwest’s expanded Denver service — growing from one day per week to five days per week — begins August 26, 2026. The new seasonal Saturday nonstop service to Austin, Texas launches October 3, 2026. Both routes depart from Charles M. Schulz-Sonoma County Airport in Santa Rosa.
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