Flight OddsWN4439 STL → BOS
Southwest Airlines · St. Louis, MO to Boston, MA · 58 flights observed, 2026-04-07 to 2026-06-03 · 1,047 mi
WN4439 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
48%
Median delay
+16 min
90th percentile
+120 min
Cancellation rate
0%
How often is WN4439 on time?
Across 58 flights on STL → BOS from 2026-04-07 to 2026-06-03, WN4439 arrived within 15 minutes of schedule 48% of the time. The median arrival delay was +16 min, and the worst 10% of flights arrived +120 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 | 28 | 48% |
| 16-30 min | 9 | 16% |
| 31-60 min | 9 | 16% |
| 61-120 min | 6 | 10% |
| 2+ hrs | 6 | 10% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-04 | 24 | 54% | +22 min |
| 2026-05 | 31 | 45% | +42 min |
| 2026-06 | 3 | 33% | +24 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 8 | 38% |
| Tue | 9 | 67% |
| Wed | 9 | 78% |
| Thu | 8 | 38% |
| Fri | 8 | 38% |
| Sat | 8 | 75% |
| Sun | 8 | 0% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…