First train to 5:30 a.m. - varies.
5:30 a.m. - 9 p.m. - every 10 minutes.
9 p.m. to 10:30 p.m. - every 12 minutes.
10:30 p.m. to last train* - every 15 minutes.
All passengers who need to travel through SeaTac Station must transfer to another train. This train runs every 16-20 minutes.