
Seattle-Tacoma International Airport (SEATAC), a bustling hub of activity nestled in the Pacific Northwest, is set to undergo a transformative change with its ambitious $400 million C Concourse expansion project. This endeavor represents more than just an infrastructural upgrade; it signifies a commitment to enhancing passenger experience, accommodating increasing demands, and embracing the future of air travel.
Officials with the Port of Seattle Commission approved $399 million for the C Concourse Expansion for the Seattle-Tacoma International Airport. As the Pacific Northwest’s primary gateway to the world, SEATAC has experienced a significant uptick in passenger numbers over the years. The C Concourse expansion is a strategic response to this surge in demand, designed to alleviate congestion, reduce wait times, and improve overall traveler satisfaction. By increasing the airport’s capacity, SEATAC aims to streamline operations and provide passengers with a seamless, efficient journey.
Officials are hoping for construction to begin as early as next year, with a ‘substantial completion’ to follow later in 2026. The project was first enacted in 2021. Beyond the immediate benefits to travelers, the expansion project will have a ripple effect on the regional economy. The creation of jobs during construction and subsequently within the expanded facilities will stimulate economic growth in the surrounding communities. Moreover, by attracting more visitors and businesses, SEA’s expansion will contribute to the economic vitality of the entire region, fostering prosperity and development.
The C Concourse expansion is not only about adding more gates; it’s about redefining the travel experience. By accommodating larger aircraft and modernizing facilities. The upgrades include low-carbon materials such as timber, which will feature prominently in the ceiling and columns of the terminal’s interior, a rooftop solar PV array, electrochromic glazing of the glass curtain wall panels and biophilic elements. A LEED v4 Silver certification is the project’s stated goal overall.
The C Concourse expansion at SEA is not just an investment in the present; it’s an investment in the future of air travel. The expansion will add 20,000-square-foot to the Alaska Airlines passenger lounge, multifaith prayer room, meditation center, nursery room, amphitheater, and a retail/dining area called The Grand Stairs. Added will be 145,530 square feet in total.


