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.

SOUTHWEST · FLIGHT WN 1376 LANDED 5:29 PM ET, ~3 MIN LATE · SCHEDULED TIME UNKNOWN
Today

WN 1376 · ATL → DCA

took off 4:14 PM ET · landed 5:29 PM ET (scheduled time unknown)
Forecast issued Tue 4:00 PM ET · 0h before departure

Odds over time

Arrive at DCA more than 15 minutes late?
30% chance · ±0 pts +6 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% 1.1d 12h 6h Now Departs Lands