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 1911 LANDED 6:40 PM ET, ~8 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

WN 1911 · HOU → DCA

took off 3:00 PM CT · landed 6:40 PM ET (scheduled time unknown)
Forecast issued Tue 10:00 PM ET · 6h after departure

Odds over time

Arrive at DCA more than 15 minutes late?
25% chance · ±0 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% 12h 6h Departs Lands