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 2737 LANDED 1:20 AM ET, ~6 MIN LATE · SCHEDULED TIME UNKNOWN

WN 2737 · LAS → BUF

took off 6:40 PM PT · landed 1:20 AM ET (scheduled time unknown)
Forecast issued Fri 10:00 PM ET · 0h before departure

Odds over time

Arrive at BUF more than 15 minutes late?
37% chance · ±1 pts – · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 15% 30% 45% 60% 2h Departs Lands