PIT → STL Southwest Airlines

Southwest Airlines · Pittsburgh, PA to St. Louis, MO · 476 flights, 2025-07-01 to 2026-06-30 · aggregated across 28 flight numbers

This route runs much more reliably at some times of day than others — 97% on-time departing 6–9am vs. 62% departing 6–9pm.
On-time arrival
83%
Median delay
-9 min
90th percentile
+33 min
Cancellation rate
0%

How on-time is Southwest Airlines from PIT to STL?

Across every Southwest Airlines flight number on PIT → STL (476 flights, 2025-07-01 to 2026-06-30), 83% arrived within 15 minutes of schedule. Median arrival delay -9 min; the worst 10% ran +33 min or later. 0% were cancelled.

Delay distribution

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

ArrivalFlightsShare
Early / on-time39683%
16-30 min296%
31-60 min265%
61-120 min194%
2+ hrs51%

Performance by month

MonthFlightsOn-timeAvg delay
2025-073586%-2 min
2025-083583%-2 min
2025-093491%-6 min
2025-103583%-3 min
2025-113194%-7 min
2025-123181%+5 min
2026-012688%-3 min
2026-022793%-6 min
2026-035476%+7 min
2026-045684%+2 min
2026-055680%+8 min
2026-065576%+3 min

Performance by day of week

DayFlightsOn-time
Mon6978%
Tue7094%
Wed6882%
Thu6881%
Fri6978%
Sat4794%
Sun8480%

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