Major upgrades to improve travelers’ experiences and increase revenue at SeattleTacoma International Airport are on the way after the Port of Seattle Commission approved the nearly $400 million project cost on Tuesday.

The Concourse C Building Expansion (CCE) project will add four floors between Concourses C and D on the east side of the airport.

The commission approved an additional $213 million in funding for the concourse expansion project on Sept. 26, adding to the previously approved $185.1 million. With a 50 vote, the commission authorized bringing the budget total of $399 million.

The creation of the project was in response to the need for additional dining and retail capacity, office space and premium lounge space at the airport, according to the project memo. New amenities that will be included with the expansion are new restrooms, an interfaith prayer and meditation room, a nursing room, an outdoor public lookout and more.

Construction is set to begin early next year with a prospective opening date in mid2026.

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