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 2015 LANDED 4:26 PM PT, ~11 MIN LATE · SCHEDULED TIME UNKNOWN
Today

QX 2015 · YVR → SEA

took off 3:56 PM PDT · landed 4:26 PM PT (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 3h after departure

Odds over time

Arrive at SEA more than 15 minutes late?
42% chance · ±0 pts +7 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 15% 30% 45% 60% 1.2d 1d 12h 6h Departs