Flight OddsWN1438 BOS → STL
Southwest Airlines · Boston, MA to St. Louis, MO · 64 flights observed, 2025-11-02 to 2026-01-05 · 1,047 mi
WN1438 covers more than one route in the data window — the stats below are for BOS → STL, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
88%
Median delay
-6 min
90th percentile
+21 min
Cancellation rate
0%
How often is WN1438 on time?
Across 64 flights on BOS → STL from 2025-11-02 to 2026-01-05, WN1438 arrived within 15 minutes of schedule 88% of the time. The median arrival delay was -6 min, and the worst 10% of flights arrived +21 min or later. 0% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 56 | 88% |
| 16-30 min | 2 | 3% |
| 31-60 min | 4 | 6% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 2 | 3% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-11 | 28 | 89% | -1 min |
| 2025-12 | 31 | 84% | +6 min |
| 2026-01 | 5 | 100% | -7 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 10 | 90% |
| Tue | 9 | 78% |
| Wed | 9 | 100% |
| Thu | 8 | 75% |
| Fri | 9 | 100% |
| Sat | 9 | 67% |
| Sun | 10 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…