Sound Transit has locked a later start date for West Seattle light rail. In its August 13, 2026 Platform update, the agency said the West Seattle Link Extension service-start timeline is now 2035 after a project timeline review tied to the updated ST3 System Plan.
For travelers, renters, and multi-year trip planners who were still using 2030 or 2032 assumptions, the practical move is simple. Rebuild any housing, commute, or Seattle itinerary that depended on early-2030s Link access to Delridge or Alaska Junction, and treat 2035 as the agency’s current public clock.
- What: West Seattle Link Extension service start now targeted for 2035.
- Where: 3.9 miles from SODO to Alaska Junction via Delridge.
- Why later: Cost-savings work delayed final design and property phases; Duwamish crossing needs more construction time.
- Savings found: More than $2 billion in cost reductions while keeping rider quality targets.
- Near term: Final design funded; property actions expected; major construction contracts aim for 2027 awards.
What Sound Transit changed this summer
The West Seattle Link Extension remains the ST3 light rail extension furthest along in project development. The line still covers about 3.9 miles from SODO to Alaska Junction, with the Delridge station in between. What changed is not the route map travelers already know, but the year the agency will put trains into revenue service.
Sound Transit says the Board adopted an updated ST3 System Plan in May to rebalance long-term finances. After that plan, staff completed a timeline review and told the Board System Expansion Committee that the updated service-start year is 2035. The agency calls that a realistic delivery date it can stand behind, even while acknowledging hard news for communities waiting for rail access.
Independent reporting from the Seattle Times places the same 2035 target in context against earlier public promises. Voters heard a 2030 opening during the 2016 ST3 campaign, then watched the goal slide toward 2032 during earlier realignment. Spring publications still clung to 2032 in places. Thursday’s agency update replaces that clock with 2035.
Why the schedule moved two to three years
Sound Transit names two primary drivers. First, cost-savings work after late-2024 cost overruns kept the project from fully advancing final design, property acquisition, and right-of-way until the agency had an affordable ST3 plan. That pause protected the program financially, but it consumed calendar years.
Second, refined construction timelines for the Board-selected project design added time. The team says building a new light-rail-only crossing of the Duwamish River is more complex than earlier construction schedules assumed. Together, those factors add about two to three years, verified by the project team and an independent third-party schedule review.
The cost-savings exercise itself was not empty process. Sound Transit says the project team found more than $2 billion in reductions that lower overall cost, cut community impacts, and still aim for a high-quality rider experience. That is confirmed agency language, not a traveler guarantee that every station amenity or fare product is frozen for a decade.
What still advances in 2026 and 2027
A later opening year does not mean the project freezes. In June, the Board authorized final design contracts that fully fund that phase and lock in identified savings. In August, the agency anticipated Board actions to authorize property acquisition and appropriate funds for purchases, relocations, and construction planning.
The Seattle Times reports that the System Expansion Committee endorsed buying 55 properties and boosting the right-of-way budget to $465 million, with full Board action expected later in August if that path holds. Appraisals, offers, sales, and possible condemnations would then unfold over about two years. An additional roughly $300 million is described for final engineering design work and construction preparation next year.
This winter, Sound Transit plans to bring on construction management services ahead of major construction contracts. Those contracts are expected to be awarded in 2027 for the bridge, tunnel, guideways, and stations. Travelers should read that as active design and property work now, not as an invitation to plan a 2028 West Seattle Link ride.
SODO transmission lines and community impact cuts
One of the more complicated segments sits in SODO, where the project must relocate Seattle City Light 230 kilovolt transmission lines. Earlier plans implied heavier construction effects on 6th Avenue South. Sound Transit now says it has agreed with partners on a technical solution that relocates the 230 kV line inside the light rail corridor and avoids that 6th Avenue S construction path.
The agency frames that change as part of a broader impact-reduction sequence after earlier Delridge and Alaska Junction design refinements reported in March 2026. For nearby businesses and through-traffic, the useful takeaway is a narrower construction footprint in SODO than the previous 6th Avenue concept, not a claim that SODO will be construction-free.
Readers planning same-week Seattle road or bridge detours should keep this long-range project separate from short-horizon closures. Deep Arrival already covered the SR 99 First Avenue South Bridge closure for August 15 to 16, which is a weekend traffic event, not a substitute for West Seattle Link service planning.
How travelers should replan now
If you are choosing a multi-year apartment near Delridge or Alaska Junction because you expected Link within a few years, recheck that assumption against 2035. Bus and ferry patterns, parking costs, and hotel location choices for Seattle city trips still matter more than a light rail station that is not open yet.
If you are building a Seattle itinerary for 2026 through the early 2030s, do not schedule a West Seattle Link hop that does not exist. Use current surface transit, rideshares, and walkable neighborhood clusters instead. For destination planning that still works without the extension, start with Deep Arrival’s things to do in Seattle guide.
If you own or are shopping property affected by the alignment, watch the August Board property actions and later offer process rather than social media summaries. Official project pages and the Platform blog remain the clean source for scope, schedule, and acquisition status.
What remains unknown is any later compression or slip beyond 2035. Sound Transit presents 2035 as the realistic public baseline after independent schedule review. Future federal grant timing, construction awards, and property outcomes can still move that baseline, so treat the year as the current official target, not a locked holiday booking product.
| If you… | What to do |
|---|---|
| Planned trips around a 2030 to 2032 West Seattle Link opening | Reset expectations to a 2035 service start and rebuild transit assumptions. |
| Are booking Seattle hotels or day trips before 2035 | Use buses, ferries, rideshares, and walkable neighborhoods; do not count on this extension. |
| Live or own property near the alignment | Follow Sound Transit property actions and official project mailings, not rumor maps. |
| Need same-week Seattle road status | Check current bridge and highway notices separately from this multi-year rail schedule. |
- Service year: Agency target is now 2035 for West Seattle Link revenue service.
- Alignment: Still about 3.9 miles from SODO to Alaska Junction via Delridge.
- Next actions: Final design is funded; property acquisition and 2027 construction awards remain on the near-term path.
- SODO change: 230 kV lines planned inside the rail corridor, avoiding earlier 6th Avenue S construction impacts.
- Open item: Later grant, property, or construction outcomes could still move the 2035 baseline.
The clean traveler read is that West Seattle Link is still advancing, but not on the early-2030s clocks many plans still carry. Use 2035 as the current official service-start year, keep watching Board property and construction milestones, and plan Seattle travel for the next several years without relying on this extension.
When will West Seattle Link start service under the new timeline?
Sound Transit now targets a 2035 service start for the West Seattle Link Extension after its summer 2026 timeline review.
What route does the West Seattle Link Extension cover?
The extension is about 3.9 miles from SODO to Alaska Junction, with a Delridge station on the peninsula alignment.
Why did the opening date move later?
Sound Transit cites cost-savings work that delayed final design and property phases, plus more construction time for the light-rail-only Duwamish River crossing.
Is the project paused completely until 2035?
No. Final design is funded, property actions are advancing, and major construction contracts are expected to be awarded in 2027 while the service-start year sits at 2035.
