Flight OddsBOS → STL Southwest Airlines
Southwest Airlines · Boston, MA to St. Louis, MO · 935 flights, 2025-07-01 to 2026-06-30 · aggregated across 34 flight numbers
On-time arrival
73%
Median delay
-1 min
90th percentile
+54 min
Cancellation rate
1%
How on-time is Southwest Airlines from BOS to STL?
Across every Southwest Airlines flight number on BOS → STL (935 flights, 2025-07-01 to 2026-06-30), 73% arrived within 15 minutes of schedule. Median arrival delay -1 min; the worst 10% ran +54 min or later. 1% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 676 | 73% |
| 16-30 min | 88 | 10% |
| 31-60 min | 79 | 9% |
| 61-120 min | 46 | 5% |
| 2+ hrs | 34 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 90 | 67% | +21 min |
| 2025-08 | 89 | 78% | +11 min |
| 2025-09 | 85 | 61% | +22 min |
| 2025-10 | 90 | 63% | +25 min |
| 2025-11 | 88 | 83% | +6 min |
| 2025-12 | 89 | 70% | +12 min |
| 2026-01 | 44 | 86% | -3 min |
| 2026-02 | 42 | 93% | -10 min |
| 2026-03 | 60 | 67% | +10 min |
| 2026-04 | 74 | 80% | +4 min |
| 2026-05 | 84 | 80% | +7 min |
| 2026-06 | 88 | 68% | +17 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 136 | 73% |
| Tue | 127 | 77% |
| Wed | 126 | 78% |
| Thu | 137 | 67% |
| Fri | 138 | 75% |
| Sat | 122 | 81% |
| Sun | 137 | 63% |
WN flight numbers on BOS → STL
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…