Given the recent publicity about long lines at SeaTac, I will share my experience. There is a SeaTac live wait time app you can download on this site: https://www.portseattle.org/sea-tac/security-screening-checkpoints
However, for us, today, we encountered the following:
We had Sky Priority so we got to use a shorter line to check in for the Delta flight. (There was, as usual for us with Delta for the flight to Paris, no way to check in online, despite many tries).
We also had TSA pre check.
Even with those two time savers, it took us just over an hour to check in and clear security…the longest it has taken us in years.