Singapore doesn't observe daylight saving time but Seattle does. DST in Seattle started on 10 March 2019 and will end on 03 November 2019. Once DST ends in Seattle the time difference between Seattle and Singapore will be 16:0 hours.
Time zone: PDT - Pacific Daylight Time (UTC/GMT -7)DST started on 10 March 2019DST will end on 03 November 2019Time zone difference / Flight distance
Time zone: SGT - Singapore Time (UTC/GMT +8)Time zone difference / Flight distance