Flight OddsSouthwest Airlines · Philadelphia, PA to St. Louis, MO · 60 flights observed, 2025-11-02 to 2026-01-05 · 814 mi
WN4039 covers more than one route in the data window — the stats below are for PHL → STL, the one it has flown most recently. The others are linked under “Other routes”.
How often is WN4039 on time?
Across 60 flights on PHL → STL from 2025-11-02 to 2026-01-05, WN4039 arrived within 15 minutes of schedule 57% of the time. The median arrival delay was +12 min, and the worst 10% of flights arrived +60 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 | 34 | 57% |
| 16-30 min | 8 | 13% |
| 31-60 min | 12 | 20% |
| 61-120 min | 5 | 8% |
| 2+ hrs | 1 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-11 | 26 | 65% | +14 min |
| 2025-12 | 29 | 45% | +30 min |
| 2026-01 | 5 | 80% | +2 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 10 | 70% |
| Tue | 9 | 56% |
| Wed | 9 | 22% |
| Thu | 8 | 75% |
| Fri | 9 | 56% |
| Sat | 5 | 60% |
| Sun | 10 | 60% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…