Tracked live by the FAA, but its flight plan was first seen after takeoff, so we don't know the scheduled time and can't say whether it's late.

HORIZON · FLIGHT QX 2160 LANDED 7:12 PM PT, ~8 MIN LATE · SCHEDULED TIME UNKNOWN

QX 2160 · SFO → PAE

took off 5:31 PM PT · landed 7:12 PM PT (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 2h after departure

Odds over time

Arrive at PAE more than 15 minutes late?
24% chance · ±1 pts +2 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 10% 20% 30% 40% 1.0d 12h 6h Departs Lands