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.

UNITED · FLIGHT UA 1814 LANDED 6:37 PM PT, ~26 MIN LATE · SCHEDULED TIME UNKNOWN

UA 1814 · EWR → SEA

took off 3:53 PM ET · landed 6:37 PM PT (scheduled time unknown)
Forecast issued Fri 10:00 PM ET · 6h after departure

Odds over time

Arrive at SEA more than 15 minutes late?
42% chance · ±0 pts −4 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 20% 40% 60% 80% 3.7d 2d 1d 12h 6h Departs Lands