Updated July 24, 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 |
|---|---|---|
| C Concourse Expansion | C Concourse | C Concourse Expansion project is opened as of Thursday, June 11! |
| Underground Controls Replacement | STS Train Shuttles | Ongoing and intermittent overnight impacts to train schedules during off hours. Impacts to cause more regular bus boarding operations. |
*information and all dates and times are subject to change
Resources
- Checkout Airport Capital Projects (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
