Flight OddsMDW → STL Southwest Airlines
Southwest Airlines · Chicago, IL to St. Louis, MO · 1,705 flights, 2025-07-01 to 2026-06-30 · aggregated across 90 flight numbers
On-time arrival
82%
Median delay
-9 min
90th percentile
+35 min
Cancellation rate
1%
How on-time is Southwest Airlines from MDW to STL?
Across every Southwest Airlines flight number on MDW → STL (1,705 flights, 2025-07-01 to 2026-06-30), 82% arrived within 15 minutes of schedule. Median arrival delay -9 min; the worst 10% ran +35 min or later. 1% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 1,385 | 82% |
| 16-30 min | 111 | 7% |
| 31-60 min | 95 | 6% |
| 61-120 min | 59 | 3% |
| 2+ hrs | 36 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 167 | 72% | +13 min |
| 2025-08 | 153 | 84% | +1 min |
| 2025-09 | 151 | 93% | -7 min |
| 2025-10 | 130 | 87% | -1 min |
| 2025-11 | 123 | 86% | -3 min |
| 2025-12 | 138 | 80% | +6 min |
| 2026-01 | 120 | 86% | -6 min |
| 2026-02 | 110 | 89% | -8 min |
| 2026-03 | 132 | 75% | +14 min |
| 2026-04 | 149 | 85% | -1 min |
| 2026-05 | 154 | 80% | +2 min |
| 2026-06 | 159 | 74% | +12 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 259 | 78% |
| Tue | 268 | 87% |
| Wed | 256 | 87% |
| Thu | 255 | 82% |
| Fri | 254 | 83% |
| Sat | 162 | 82% |
| Sun | 232 | 76% |
WN flight numbers on MDW → STL
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…