SLC to Santa Rosa: Delta vs. Alaska, Explained

Salt Lake City gets a new nonstop to Charles M. Schulz–Sonoma County Airport (STS) this fall, followed less than a month later by a competing airline on the same route. Delta begins twice-daily service on October 6, 2026. Alaska begins seasonal service November 1, operating up to daily through April 21, 2027.

That overlap can create as many as three nonstop choices a day. It is unusual for a short regional route from SLC, where Delta is often the only nonstop operator, and it gives Wine Country travelers a practical alternative to flying into San Francisco or Oakland and driving north through Bay Area traffic.

Delta versus Alaska

Delta has the schedule advantage: two flights a day and no announced end date. Alaska’s published season is explicitly temporary, ending April 21, 2027. During the overlap, compare the exact departure time and total fare rather than assuming the airline with the lower base price is automatically cheaper. Baggage rules, seat selection and loyalty benefits can change the total.

Both airlines plan to use SkyWest-operated Embraer E175 regional jets. The E175 has a two-by-two layout, so there are no middle seats, but overhead-bin space is still more limited than on a mainline narrowbody. A full-size roller that is accepted on a larger aircraft may be valet-checked at the gate.

Which airport this actually serves

STS is at the north end of Santa Rosa, in Sonoma County. It is the convenient airport for Santa Rosa, Windsor, Healdsburg and much of Sonoma Wine Country. It is not a generic substitute for every Bay Area airport, and it is not located in Napa.

For a Sonoma-focused trip, landing at STS avoids the long drive north from SFO or OAK. For Napa Valley, compare the complete itinerary before booking: the flight may be easier, but Napa still requires a cross-county ground transfer. The right airport depends on the hotel, tasting reservations and whether the trip also includes San Francisco.

Rental car or no rental car?

Sonoma County Airport lists rental counters in baggage claim and multiple on-site agencies, with key-drop boxes for returns before early departures. That makes a rental car the simplest option for an itinerary spread across several towns or wineries.

A car is not the only option. STS also has rideshare, taxis, shuttles and county bus service, and the SMART rail station is a little over a mile from the airport rather than inside the terminal. A hotel-based trip in Santa Rosa can work without a car. A winery-to-winery itinerary usually needs a rental, prearranged tour or designated-driver service; public transit is not designed around a custom tasting schedule.

If wine tasting is part of the trip, do not plan to drive between appointments after drinking. Book a tour, driver or other transport before arrival.

Alaska’s Wine Flies Free benefit

Alaska gives this route one benefit Delta does not match: eligible Atmos Rewards members can check one properly packed case of wine—up to 12 bottles—at no charge on flights departing from participating Wine Flies Free airports, including Santa Rosa. Alaska highlights that benefit in the route announcement itself.

The benefit applies to Alaska’s flight, not Delta’s, and membership, packaging and baggage conditions still apply. Read the current rules before buying wine or arriving at STS with a case; a marketing headline is not a substitute for the airline’s acceptance requirements.

What to check before booking

• Confirm that the flight is nonstop and uses STS, not SFO, OAK or Sacramento.
• For travel after April 21, 2027, do not assume Alaska’s seasonal service has been renewed.
• Compare the full fare after bags and seat selection.
• Reserve a rental car or tasting transport before a busy Wine Country weekend.
• Recheck the airline schedule close to departure. These are newly launched regional flights, and frequencies can change after the first season.

The key date is October 6: before then, the route is announced and bookable but not yet operating. From November 1 through April 21, the competitive overlap creates the best schedule choice. After that, Delta is the only announced operator unless Alaska publishes another season.