Spirit Airlines will add SEA to its route network next spring, the carrier announcing it will launch service from two existing destinations to the largest metropolitan area in the Pacific Northwest.
Fort Lauderdale-based Spirit Airlines will being operating twice-daily between SEA and LAX on 3/24/16

Then, 4/14/16 the carrier will start twice-daily service between LAS and SEA.
According to Spirit, it will offer connections from its SEA flights to Focus cities via LAS and LAX.