Seattle-Tacoma International Airport (SEA) December 2025 Flight Statistics Report (Flight Volume, On-Time Performance, Cancellations)

Flight Volume and Growth Trends

In December 2025, Seattle-Tacoma International Airport (SEA) recorded a total of 18,400 departing flights. This represents a year-over-year increase of +14.05%, highlighting a significant recovery in air travel demand. The growth can be attributed to increased holiday travel and the addition of new routes by several airlines. SEA continues to be a major hub for both domestic and international flights, with its strategic location contributing to its growing importance in the Pacific Northwest region.

On-Time Performance Analysis

The on-time performance rate for departing flights at SEA in December 2025 was 61.07%. This marks a decline of -12.64 percentage points compared to the same period last year. The decrease in punctuality can be attributed to adverse weather conditions and increased air traffic during the holiday season. Despite these challenges, SEA has implemented measures to improve operational efficiency, including enhanced coordination with airlines and air traffic control to minimize delays.

Cancellations and Operational Stability

SEA reported 190 flight cancellations in December 2025, a significant year-over-year increase of +63.79%. The rise in cancellations was primarily due to severe winter storms that disrupted operations. While the airport faced challenges in maintaining operational stability, it worked closely with airlines to rebook affected passengers and provide timely updates. SEA's commitment to passenger service remains a top priority, even during periods of operational disruption.

Overall Assessment and Outlook

December 2025 was a mixed month for SEA, with strong growth in flight volume but challenges in on-time performance and cancellations. The airport's ability to handle increased traffic while addressing weather-related disruptions demonstrates its resilience. Looking ahead, SEA plans to invest in infrastructure upgrades and technology to enhance passenger experience and operational efficiency. These efforts are expected to support continued growth and improve reliability in the coming years.

Travel Recommendations and Passenger Tips

Passengers traveling through SEA in the winter months are advised to plan for potential weather-related delays. Utilizing tools like the NextFly App can help travelers stay informed about their flights, including scheduled and actual times, boarding gate information, and airport departure and arrival boards. The app also provides features such as delay alerts, gate change notifications, and arrival reminders, ensuring a smoother travel experience. Additionally, passengers are encouraged to arrive early during peak travel periods and check the airport's website for real-time updates on security wait times and parking availability.