The Port of Seattle has closed the longest runway (designated 16L/34R) at Seattle-Tacoma International Airport for an estimated 90 days for several upgrades related to the opening of the expansion of the North Satellite Modernization project set for early next year. The closure was initially delayed due to a recent labor strike but began late in the evening on Sunday, September 9.

The closure is not expected to cause major delays as the other two runways will be used during the construction, however, weather can cause potential delays. The Port has been working with our airline partners to make the adjustment as seamless as possible. Area homeowners will see air traffic shifting to the other two runways during the construction period.

For more information on the details of the construction, view this blog post on our Port Newsroom page.