The average bus between SeaTac and Black Diamond takes 1h 18m and the fastest bus takes 1h 12m. The bus service runs several times per day from SeaTac to Black Diamond. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.
Buses run every 4 hours between SeaTac and Black Diamond. The earliest departure is at 8:08 AM in the morning, and the last departure from SeaTac is at 2:59 PM which arrives into Black Diamond at 4:27 PM. All services require a transfer at Renton TC - Bay 1 and take an average of 1h 18m. The schedules shown below are for the next available departures.

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Want to know about travelling from SeaTac to Black Diamond? We have put together a list of the most frequently asked questions from our users such as: What is the cheapest mode of transport? What is the quickest option? How much do tickets usually cost? and many more.
No, there is no direct bus from SeaTac to Black Diamond. However, there are services departing from SeaTac station and arriving at Black Diamond station via Renton TC - Bay 1. The journey, including transfers, takes approximately 1h 18m.
SeaTac to Black Diamond bus services, operated by Sound Transit, depart from SeaTac Station.
SeaTac to Black Diamond bus services, operated by Sound Transit, arrive at Baker St & 3rd Ave station.
The distance between SeaTac and Black Diamond is 26.7 km. The road distance is 39 km.
You can take a bus from SeaTac Station to Baker St & 3rd Ave via Renton TC - Bay 1 and Renton Transit Center - Bay 6 in around 2h.