King County / Bus
Sound Transit, Metro Transit, City of Seattle - King County Metro 121 live tracking and departures
121 · America/Los_Angeles
Selected branch: Downtown Seattle Via SR-509 · 14 stops.
121 live vehicle tracking
Live data unavailable. Fresh vehicle positions only; 0 fresh vehicles matched to this route. The map shows vehicles assigned to the selected stopping pattern. Vehicles on other branches may be omitted.
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Official route geometry · 0 fresh vehicles on selected branch
Positions refresh every 30 seconds. An absent marker does not establish a canceled trip. Predictions and vehicle positions can have different availability.
Next departures from Burien Transit Center - Bay 5
Downtown Seattle Via SR-509Scheduled
6:15 AM6:15 AM · Fri, Oct 30
Downtown Seattle Via SR-509Scheduled
7:00 AM7:00 AM · Fri, Oct 30
Downtown Seattle Via SR-509Scheduled
7:45 AM7:45 AM · Fri, Oct 30
Downtown Seattle Via SR-509Scheduled
8:30 AM8:30 AM · Fri, Oct 30
Downtown Seattle Via SR-509Scheduled
4:21 PM4:21 PM · Fri, Oct 30
Downtown Seattle Via SR-509Scheduled
5:06 PM5:06 PM · Fri, Oct 30
Downtown Seattle Via SR-509Scheduled
5:51 PM5:51 PM · Fri, Oct 30
Downtown Seattle Via SR-509Scheduled
6:36 PM6:36 PM · Fri, Oct 30
Live data unavailable · Live predictions and published schedule fallbacks are labeled on each departure.
More Sound Transit, Metro Transit, City of Seattle - King County Metro travel information
Published Sound Transit, Metro Transit, City of Seattle - King County Metro schedule
Imported Oct 24, 2026 · 04:36 UTC · Service dates 2026-08-29 through 2027-12-31. See data status
Schedule data published by Sound Transit, Metro Transit, City of Seattle - King County Metro. Feed discovery and cached source archives from MobilityData. Source details ↗