Port of Seattle Police and Fire personnel are investigating a security incident at Seattle–Tacoma International Airport that led to the closure of two runways on Saturday afternoon, June 14, 2025, officials said.

Airport authorities reported that the situation involved an aircraft on runway 16R/34L.

Two of the airport’s three runways were shut down while the investigation was underway; one runway remained open for limited operations.

Alaska Airlines confirmed that 68 passengers and four crew members were deplaned from an aircraft following a reported threat during taxiing. That incident triggered the runway closures and an overall disruption of airport operations.

Airport officials advised travelers to check with their airlines for flight status updates and said further information would be posted on the airport’s website here.

Here’s the timeline from the Port of Seattle:

  • June 14, 2025, 3:19 p.m.: Runway 16R is expected to reopen shortly and SEA Airport will return to normal operations. Please continue to check in with your airline about your flight status.
  • June 14, 2025, 1:58 p.m.:All passengers have been deplaned. Suspect in custody. Center runway has been reopened. Investigation with aircraft continues with 16R still closed. Track your flight with your airline.
  • June 14, 2025, 1:34 p.m.: One suspect is in custody. Passengers will be deplaned and returned to terminal after security screening.
  • June 14, 2025 1:16 p.m.: Currently two runways are closed: 16R/16C. One runway is open: 16L. Travelers should monitor your airlines for your specific flight.
  • June 14, 2025 1:03 p.m.: Port of Seattle Police and Fire Departments are investigating a situation involving an aircraft on 16R/34L runway.

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Courtesy KING5 News: