Flight OddsSTL → MDW Southwest Airlines
Southwest Airlines · St. Louis, MO to Chicago, IL · 1,704 flights, 2025-07-01 to 2026-06-30 · aggregated across 92 flight numbers
On-time arrival
80%
Median delay
-7 min
90th percentile
+37 min
Cancellation rate
1%
How on-time is Southwest Airlines from STL to MDW?
Across every Southwest Airlines flight number on STL → MDW (1,704 flights, 2025-07-01 to 2026-06-30), 80% arrived within 15 minutes of schedule. Median arrival delay -7 min; the worst 10% ran +37 min or later. 1% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 1,352 | 80% |
| 16-30 min | 118 | 7% |
| 31-60 min | 115 | 7% |
| 61-120 min | 67 | 4% |
| 2+ hrs | 30 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 167 | 69% | +18 min |
| 2025-08 | 151 | 76% | +6 min |
| 2025-09 | 151 | 85% | -1 min |
| 2025-10 | 130 | 83% | 0 min |
| 2025-11 | 122 | 90% | -5 min |
| 2025-12 | 138 | 78% | +9 min |
| 2026-01 | 120 | 88% | -2 min |
| 2026-02 | 111 | 90% | -6 min |
| 2026-03 | 131 | 73% | +13 min |
| 2026-04 | 148 | 85% | +3 min |
| 2026-05 | 155 | 84% | -3 min |
| 2026-06 | 158 | 70% | +12 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 258 | 76% |
| Tue | 269 | 88% |
| Wed | 255 | 84% |
| Thu | 252 | 75% |
| Fri | 253 | 82% |
| Sat | 162 | 79% |
| Sun | 233 | 77% |
WN flight numbers on STL → MDW
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…