Flight OddsWN3948 STL → BOS
Southwest Airlines · St. Louis, MO to Boston, MA · 49 flights observed, 2026-04-07 to 2026-06-03 · 1,047 mi
WN3948 covers more than one route in the data window — the stats below are for STL → BOS, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
82%
Median delay
-1 min
90th percentile
+28 min
Cancellation rate
0%
How often is WN3948 on time?
Across 49 flights on STL → BOS from 2026-04-07 to 2026-06-03, WN3948 arrived within 15 minutes of schedule 82% of the time. The median arrival delay was -1 min, and the worst 10% of flights arrived +28 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 | 40 | 82% |
| 16-30 min | 5 | 10% |
| 31-60 min | 2 | 4% |
| 61-120 min | 1 | 2% |
| 2+ hrs | 1 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-04 | 21 | 86% | -1 min |
| 2026-05 | 25 | 84% | +13 min |
| 2026-06 | 3 | 33% | +35 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 8 | 63% |
| Tue | 9 | 78% |
| Wed | 9 | 89% |
| Thu | 8 | 63% |
| Fri | 8 | 100% |
| Sat | No data | — |
| Sun | 7 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…