PHX → STL Frontier Airlines

Frontier Airlines · Phoenix, AZ to St. Louis, MO · 53 flights, 2025-10-10 to 2026-04-11 · aggregated across 2 flight numbers

This route runs much more reliably at some times of day than others — 100% on-time departing 6–9am vs. 57% departing 12–3pm.
On-time arrival
83%
Median delay
-5 min
90th percentile
+46 min
Cancellation rate
2%

How on-time is Frontier Airlines from PHX to STL?

Across every Frontier Airlines flight number on PHX → STL (53 flights, 2025-10-10 to 2026-04-11), 83% arrived within 15 minutes of schedule. Median arrival delay -5 min; the worst 10% ran +46 min or later. 2% were cancelled.

Delay distribution

Arrival delay for completed flights (excludes cancellations and diversions).

ArrivalFlightsShare
Early / on-time4383%
16-30 min24%
31-60 min24%
61-120 min36%
2+ hrs24%

Performance by month

MonthFlightsOn-timeAvg delay
2025-10771%+144 min
2025-117100%-17 min
2025-12978%+5 min
2026-01786%-6 min
2026-028100%-6 min
2026-031267%+26 min
2026-042100%-17 min

Performance by day of week

DayFlightsOn-time
Mon1872%
TueNo data—
WedNo data—
Thu333%
Fri2295%
Sat2100%
Sun786%

F9 flight numbers on PHX → STL

Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…