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 1325 SCHEDULED · SCHEDULED TIME UNKNOWN
Today

WN 1325 · DAL → BWI

departs 2:38 AM CT · arrives 6:05 AM ET
Your aircraft is N485WN (B737), coming in as WN 1359 from STL: still at STL, due off about 12:01 AM CT, 72 min before departure.
Forecast issued Sat 12:00 AM ET · 4h before departure

Odds over time

Arrive at BWI more than 15 minutes late?
29% chance · ±0 pts – · 24h
HOW SURE WE ARE High. The odds now come mostly from live FAA and airport data.
LIVE IN THE AIR 0% 15% 30% 45% 60% 8h 6h Now Departs Lands