Alaska Airlines will begin flights between Seattle and San Antonio on 17 September.
The Seattle-based carrier will operate once daily on the route using a Boeing 737-800 aircraft.
Alaska plans to grow capacity by about 6% this year with the addition of the larger Boeing 737-900ER to its fleet and up to five new destinations. It began flights to Kansas City in March, plans to add Philadelphia in June and shift its existing Miami to Seattle flight to Ft. Lauderdale in June.
The airline will compete with Southwest Airlines on the Seattle to San Antonio route, according to the Innovata schedules.