Alaska Airlines is expanding in San Diego, adding thrice-daily service to Phoenix, Chicago O'Hare and Denver.
Alaska will also increase frequencies on four San Diego routes beginning Oct. 26. Combined, the new routes and frequencies will beef up Alaska's San Diego flights by 30%. It will also grow the combined San Diego route network of Alaska and Hawaiian Airlines to 44 nonstop destinations.
Phoenix service will start on Aug. 20. Alaska will compete on the route with American, Southwest and Frontier, Cirium flight data shows.
The O'Hare and Denver routes will begin Oct. 4. Alaska will compete against United and American on San Diego-Chicago, and United, Southwest and Frontier on San Diego-Denver.
Alaska will add frequencies on San Diego service to Las Vegas, Sacramento, San Jose and Salt Lake City. It will fly six times per day to the first three cities, up from the current four. Alaska will increase San Diego-Salt Lake City service from daily to three times per day.
The San Diego expansion follows Alaska's decision to pull back on service from California to Washington Dulles due to a decrease in government travel, end Bahamas service from the West Coast and drop its Chicago-San Francisco route.