Seattle-Tacoma Moves Forward with $2.5B S Concourse Renovation

Project expected to improve the customer experience and increase operational efficiency.

Meg Godlewski

Wednesday, August 12, 2026 at 11:02 AM ET

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Edited By:

Zach Vasile

Seattle-Tacoma International Airport [Credit: Shutterstock]

Key Takeaways:

Seattle-Tacoma International Airport (KSEA) will undergo a $2.5 billion renovation of its S Concourse, with work scheduled to begin in 2027 and conclude by 2034.
The project aims to modernize the 1973-era facility, adding 150,000 square feet, new amenities like dining, shopping, and lounges, and improving operational efficiency and passenger experience.
Key upgrades include structural and seismic improvements, a new Upper Concourse Level, and enhanced dual-level boarding, all achieved by repurposing existing space rather than adding new gates due to limited expansion room.
Construction will be phased over eight years to minimize disruption to flight operations, impacting only three of the 12 gates at any given time, with a temporary annex to support ground boarding.

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International travelers passing through Seattle will soon have a different experience passing through the S Concourse at Seattle-Tacoma International Airport (KSEA). According to officials from the Port of Seattle, the concourse will be getting a $2.5 billion renovation, transforming the 1973-era facility into a more modern space. Work is slated to begin in 2027.

“Today’s authorization to move forward with the S Concourse Evolution builds on the generational investments we are making at SEA to improve the passenger experience,” Port of Seattle Commission President Ryan Calkins said in a statement. “The project will add critical seismic, structural, and building systems upgrades to improve long-term passenger circulation as well as operational efficiency.”