Flight OddsWN4409 STL → BOS
Southwest Airlines · St. Louis, MO to Boston, MA · 30 flights observed, 2025-10-02 to 2025-11-01 · 1,047 mi
WN4409 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
55%
Median delay
+15 min
90th percentile
+77 min
Cancellation rate
3%
How often is WN4409 on time?
Across 30 flights on STL → BOS from 2025-10-02 to 2025-11-01, WN4409 arrived within 15 minutes of schedule 55% of the time. The median arrival delay was +15 min, and the worst 10% of flights arrived +77 min or later. 3% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 16 | 55% |
| 16-30 min | 3 | 10% |
| 31-60 min | 5 | 17% |
| 61-120 min | 4 | 14% |
| 2+ hrs | 1 | 3% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-10 | 28 | 54% | +28 min |
| 2025-11 | 1 | 100% | -20 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 3 | 67% |
| Tue | 4 | 75% |
| Wed | 4 | 50% |
| Thu | 5 | 20% |
| Fri | 4 | 50% |
| Sat | 5 | 100% |
| Sun | 4 | 25% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…