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 3732 LANDED 10:33 PM ET, ~5 MIN LATE · SCHEDULED TIME UNKNOWN

WN 3732 · STL → DCA

took off 7:59 PM CT · landed 10:33 PM ET (scheduled time unknown)
Forecast issued Fri 10:00 PM ET · 1h after departure

Odds over time

Arrive at DCA more than 15 minutes late?
69% chance · ±2 pts – · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
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