This app was mentioned in 4 comments, with an average of 1.00 upvote
The last light rail from seatac leaves at 1:19 am. So you MIGHT be able to catch it if you got off quick, had an idea of where you were going, and hustled.
Also, the metro trip planner should help. Also consider downloading the onebusaway app, to get real time scheduling for transit.
edit: If it is a sunday, the last train leaves at 12:19 am.
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apps called one bus away its from Hart which is your bus folks in hills.
> ONE STOP AWAY APP
This one? https://play.google.com/store/apps/details?id=com.joulespersecond.seattlebusbot&hl=en
You mean this app that's chilling on the Play store, ready to be installed by anyone?