STL → MCI Southwest Airlines

Southwest Airlines · St. Louis, MO to Kansas City, MO · 1,020 flights, 2025-07-01 to 2026-06-30 · aggregated across 52 flight numbers

This route runs much more reliably at some times of day than others — 95% on-time departing 6–9am vs. 57% departing 9pm–12am.
On-time arrival
76%
Median delay
-3 min
90th percentile
+43 min
Cancellation rate
0%

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

Across every Southwest Airlines flight number on STL → MCI (1,020 flights, 2025-07-01 to 2026-06-30), 76% arrived within 15 minutes of schedule. Median arrival delay -3 min; the worst 10% ran +43 min or later. 0% were cancelled.

Delay distribution

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

ArrivalFlightsShare
Early / on-time77576%
16-30 min9710%
31-60 min747%
61-120 min465%
2+ hrs252%

Performance by month

MonthFlightsOn-timeAvg delay
2025-079268%+20 min
2025-089180%+4 min
2025-099084%+4 min
2025-108878%+5 min
2025-118186%0 min
2025-128461%+15 min
2026-017081%+11 min
2026-027183%+2 min
2026-038681%+10 min
2026-048673%+10 min
2026-058874%+9 min
2026-069066%+13 min

Performance by day of week

DayFlightsOn-time
Mon15370%
Tue15183%
Wed14582%
Thu15175%
Fri15082%
Sat11677%
Sun15164%

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