SEATTLE, Wash. – The Port of Seattle Commission approved a $399 million expansion of the C Concourse expansion at Seattle-Tacoma International Airport in early October.

Turner Construction will build the project. No taxpayer dollars will fund the work; instead, a combination of federal airport development funds and future revenue bonds will finance the work.

Construction will start in early 2024. The concourse expansion will add four stories to the existing three-story facility – part of Sea-Tac’s strategy to maximize development opportunities on a limited site footprint.

Miller Hull of Seattle and Woods Bagot of Australia are the project architects. The expansion is part of the Port of Seattle’s five-year, $5.3 billion capital plan.
According to Port representatives, the project includes both the C and D Concourses and will add dining and retail plus an interfaith prayer and meditation room, a nursing suite and Alaska Airlines’ 20,000-square-foot-plus lounge. The Grand Stairs at C will serve as an iconic destination that invites travelers to linger with seating and gain unobstructed views of the airfield and Olympic Mountains via a lookout deck encased in glass. Airport visitors may climb the stairs to also realize more elbow room and dining and retail options.

The construction project increases the existing 81,000-square-foot building into a spacious 226,530-square-foot double concourse.