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.

FRONTIER · FLIGHT F9 1704 LANDED 4:17 PM CT, ~6 MIN LATE · SCHEDULED TIME UNKNOWN
Yesterday

F9 1704 · PHX → IAH

took off 12:13 PM MT · landed 4:17 PM CT (scheduled time unknown)
Forecast issued Sat 10:00 PM ET · 7h after departure

Odds over time

Arrive at IAH more than 15 minutes late?
37% chance · ±0 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