New Terminal 1, added gates and a slate of new nonstops push Southwest’s San Diego growth through 2026
Southwest Airlines (Courtesy Wikipedia)San Diego, California (Times Media Service) – Southwest San Diego is getting bigger. The airline is adding new nonstop routes and more frequencies tied to the opening of San Diego International Airport’s New Terminal 1 this fall, including a twice-daily link to Fresno starting Oct. 2, 2025, plus additional San Diego service rolling out in March 2026 to Seattle, Eugene, Portland, Maui and Puerto Vallarta, with Saturday-only seasonal flights to Bozeman and Spokane.
Southwest San Diego expansion: what’s changing and when
Southwest San Diego service grows in two waves. First, on Oct. 2, 2025, the carrier launches twice-daily nonstop flights between San Diego (SAN) and Fresno Yosemite International Airport (FAT). The same schedule period also brings an upgrade on Tampa service from once-weekly Saturday flights to five days a week (Thursday through Monday) and extends four seasonal routes—Colorado Springs, Columbus, Milwaukee and San José del Cabo—into the October timetable.
The second wave arrives with Southwest’s March 2026 schedule extension. Beginning March 5, 2026, Southwest adds daily, year-round San Diego flights to Seattle, Eugene, Portland, Maui (Kahului), and Puerto Vallarta. Starting March 7, the airline layers in Saturday-only seasonal service to Bozeman and Spokane.
For travelers, that means more same-day options up and down the West Coast, a new intra-California link to the Central Valley, and added Hawaii and Mexico choices from a single-runway airport that keeps getting busier. The Southwest San Diego additions are designed to give locals more nonstop options and better connections through the network.
New Terminal 1 unlocks capacity—and an easier trip to the curb
Airport officials say Phase 1A of the New Terminal 1 opens in September 2025 with 19 gates, growing to 30 gates when Phase 1B is finished in 2028. Southwest San Diego flights will operate from the new facility alongside other carriers once it opens, giving the airline more room to grow and modern amenities for travelers.
Ahead of opening day, the airport previewed the terminal to the public and said the first flights will arrive the evening of Sept. 22, setting the stage for a full opening on or about Sept. 23. That timing aligns with the Southwest San Diego rollout planned for the fall schedule.
Getting to the terminal should be easier, too. A new on-airport roadway designed to pull traffic off Harbor Drive is opening ahead of the terminal debut to speed access to Terminals 1 and 2. Combined with a large parking plaza next to T1, the new road system aims to smooth the curb-to-gate experience for Southwest San Diego travelers.
Why Southwest is adding San Diego flights now
San Diego demand has been strong. The airport set a passenger record in 2024 and continues to grow as new gates and amenities come online. That steady rise helps explain why Southwest San Diego is a focus in the airline’s latest schedule updates and why the carrier is committing to both business and leisure routes from SAN.
Competitive pressure plays a role. The new San Diego routes overlap with a key West Coast competitor’s network, signaling a head-to-head contest for travelers. By increasing nonstop options to Seattle, Portland and Eugene, Southwest San Diego is positioning to keep fares sharp and schedules frequent where rivals are also expanding.
Add Hawaii to the mix and the strategy is clearer. With daily Maui service slated for March 2026, Southwest San Diego strengthens its leisure offering while using the New T1’s gate capacity to handle peak holiday and spring-break demand. That combination of business and vacation routes is central to Southwest’s San Diego plans.
What the airline and airport are saying
Airport leaders have framed New Terminal 1 as a once-in-a-generation upgrade that will speed security, expand concessions and add gates—exactly what’s needed as San Diego grows. Southwest San Diego stands to benefit most from the first phase because the airline is the airport’s largest carrier and is ready with a slate of routes timed to the opening.
Southwest’s recent schedule briefings highlighted growth in San Diego alongside other markets, framing the city as a California stronghold that benefits from new facilities. That public stance matches the airline’s decisions to boost West Coast connectivity and sun-market leisure flying from SAN.
For airport planners, more gates and a new entrance road are part of a multi-billion-dollar redevelopment program. The project timeline—Phase 1A in September 2025 and Phase 1B in 2028—creates room for the Southwest San Diego route map to keep expanding as demand warrants.
How to use the new flights: booking and travel tips
If your plans include Fresno, Tampa, or the seasonal Colorado Springs, Columbus, Milwaukee or San José del Cabo runs, look for the October 2025 schedule; Fresno begins Oct. 2 with two daily round-trips. For Seattle, Eugene, Portland, Maui and Puerto Vallarta, target travel dates starting March 5, 2026, and for Bozeman and Spokane, look at March 7 Saturdays. Booking early is wise as introductory fare windows can close quickly on new Southwest San Diego routes.
Build in extra time during the first weeks after New T1 opens as drivers and rideshares adjust to the new entrance road and curb areas. Watch airport alerts and signage for lane changes. These small steps can smooth the Southwest San Diego departure experience during the transition.
Frequent flyers should also check how the new schedule connects through Southwest’s network to the Mountain West, Pacific Northwest and Hawaii. The added nonstops improve one-stop options across the system, which can make Southwest San Diego an easier starting point for more destinations with shorter total travel time.
Reaction and impact in San Diego County
For San Diego County residents, the expansion means more choices without a connection in Los Angeles or the Bay Area. Families visiting California’s Central Valley now have a reliable, twice-daily option, while weekenders gain fresh mountain and Northwest escapes once the March 2026 flights launch. The Southwest San Diego expansion also signals confidence in the region’s travel market and tourism economy.
Business travelers stand to benefit from increased frequency and competition on key corridors like Seattle and Portland. More seats typically mean steadier prices and better schedule coverage throughout the day. That’s a key reason the Southwest San Diego build-out matters beyond leisure travel.
Local tourism leaders expect the New Terminal 1 to boost visitor throughput with modern amenities and faster access roads. Combined with the route growth, Southwest San Diego is positioned to help support hospitality jobs and conventions by making it easier to get here—and to get back home on a convenient nonstop.
