Updated February 2, 2026
Know before you go. Stay up to date on airport construction and how it might impact your journey.
Current construction impacts
| PROJECT | IMPACTED AREA | IMPACT DESCRIPTION |
|---|---|---|
| Roadway Improvements | Overnight lane impacts and detour to Parking Garage at the north entry |
There will be some upcoming paving work on the southbound Airport Expressway. They are tentatively scheduled for the nights of Feb. 10 and 11, however weather-dependent. The lane impacts and detours will take place during the overnight hours of 10 p.m. to 8 a.m. The first overnight closure impacts the entry to the Parking Garage and traffic will be detoured to Arrivals Drive and south entrance to the Parking Garage. The second night will impact the entrance to the Ground Transportation area, entry route will have a slight detour. |
| C Concourse Expansion | Checkpoint 5 CLOSED | Starting Tuesday, Jan. 6, 2026, Checkpoint 5 will close for approximately 5 weeks. Work is happening on the secure side to the flooring/terrazzo work along the C and D Concourses. TSA security screening lanes will be accommodated at other checkpoints. Visit the Security webpage for more information. |
| C Concourse Expansion | C and D Concourse corridors | Temporary barricades have been erected creating narrower hallways along the C and D concourses. Crews for the CCE project are working on terrazzo flooring replacement. Barricades will come down in mid-February. |
*all dates and times are subject to change
Resources
- Check Upgrade SEA to learn more about current and future airport improvements
- Get step-by-step directions throughout the airport and see available routes, detours and more on our interactive map
