Flight OddsSTL → BOS Southwest Airlines
Southwest Airlines · St. Louis, MO to Boston, MA · 934 flights, 2025-07-01 to 2026-06-30 · aggregated across 34 flight numbers
On-time arrival
68%
Median delay
+3 min
90th percentile
+63 min
Cancellation rate
1%
How on-time is Southwest Airlines from STL to BOS?
Across every Southwest Airlines flight number on STL → BOS (934 flights, 2025-07-01 to 2026-06-30), 68% arrived within 15 minutes of schedule. Median arrival delay +3 min; the worst 10% ran +63 min or later. 1% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 626 | 68% |
| 16-30 min | 98 | 11% |
| 31-60 min | 104 | 11% |
| 61-120 min | 64 | 7% |
| 2+ hrs | 33 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 90 | 60% | +23 min |
| 2025-08 | 89 | 81% | +7 min |
| 2025-09 | 86 | 62% | +26 min |
| 2025-10 | 91 | 54% | +27 min |
| 2025-11 | 85 | 73% | +15 min |
| 2025-12 | 89 | 81% | +3 min |
| 2026-01 | 44 | 82% | +2 min |
| 2026-02 | 43 | 86% | +1 min |
| 2026-03 | 60 | 62% | +26 min |
| 2026-04 | 76 | 67% | +11 min |
| 2026-05 | 84 | 63% | +25 min |
| 2026-06 | 88 | 57% | +22 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 137 | 63% |
| Tue | 129 | 72% |
| Wed | 125 | 69% |
| Thu | 138 | 69% |
| Fri | 138 | 72% |
| Sat | 121 | 69% |
| Sun | 137 | 61% |
WN flight numbers on STL → BOS
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…