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 1905 LANDED 6:16 PM CT, ~1 MIN LATE · SCHEDULED TIME UNKNOWN

UA 1905 · SFO → STL

took off 1:01 PM PT · landed 6:16 PM CT (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 6h after departure

Odds over time

Arrive at STL more than 15 minutes late?
30% 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% 10% 20% 30% 40% 21h 12h 6h Departs Lands