Seattle-Tacoma International Airport (SEA), commonly known as Sea-Tac, remains a pivotal hub in the Pacific Northwest, connecting millions of travelers to destinations worldwide. As we progress through 2025, SEA has introduced several updates and faced notable events that travelers and stakeholders should be aware of.
Record-Breaking Passenger Traffic
In 2025, SEA anticipates handling approximately 53.5 million passengers, marking a 1.7% increase from the previous year. This growth is attributed to a surge in international travel, which has risen by 15% compared to 2019 levels, reaching around 6.6 million passengers. Domestic travel has also seen a slight uptick, surpassing 2019 figures by 0.1%, with about 46 million travelers.
Ongoing Expansion and Modernization
To accommodate the increasing passenger volume and enhance overall efficiency, SEA is undergoing significant expansion projects:
- Sustainable Airport Master Plan (SAMP): This comprehensive plan includes over 30 projects aimed at improving airport operations, such as the addition of a new terminal with 19 gates and an automated people mover system.
- Concourse C Expansion: A four-story addition to Concourse C is underway, featuring a central gathering space beneath a large wooden ceiling. This $399 million project is expected to be completed by 2027.
- Unified Baggage Handling System: A $320.4 million project aims to create a high-speed, unified baggage system, allowing for more efficient processing and routing of luggage across the airport.
REAL ID Enforcement Begins May 7
Starting May 7, 2025, travelers using the SEA Visitor Pass program must present a REAL ID-compliant form of identification to proceed through TSA security screening. The Transportation Security Administration (TSA) has warned that approximately 20% of travelers may not be prepared for this change, potentially leading to significant delays.
Recent Security Incident
On May 4, 2025, an inmate identified as Sedrick T. Stevenson escaped custody at SEA while being transported to Kentucky. During the check-in process, Stevenson fled towards the airport’s light rail station and boarded a northbound train. Surveillance footage confirmed his exit at Seattle’s Capitol Hill station. Despite thorough searches, he remains at large. Notably, this incident did not disrupt airport operations.
New Flight Routes and Services
SEA continues to expand its global reach with new direct flight offerings:
- Hainan Airlines: Resumed direct service to Beijing, increasing connectivity between Seattle and China.
- Alaska Airlines: Announced plans to launch nonstop service to Toronto, marking a return to the Canadian city after more than 30 years.
Transportation and Accessibility Enhancements
To improve ground transportation around SEA, the Washington State Department of Transportation is extending State Route 509. This project includes the construction of a new interchange with I-5, scheduled for completion in 2025, aiming to alleviate congestion and enhance airport accessibility.
Travel Tips for SEA Passengers
- Plan Ahead: Given the anticipated increase in passenger traffic, arrive at the airport well in advance of your flight.
- REAL ID Compliance: Ensure you have a REAL ID-compliant form of identification by May 7 to avoid delays.
- Stay Informed: Monitor SEA’s official channels for updates on construction projects and potential impacts on travel.
Seattle-Tacoma International Airport continues to evolve, striving to meet the demands of modern air travel while enhancing the passenger experience. By staying informed and prepared, travelers can navigate SEA with confidence and ease.
