Flight OddsWN3731 STL → BOS
Southwest Airlines · St. Louis, MO to Boston, MA · 33 flights observed, 2026-03-05 to 2026-04-06 · 1,047 mi
WN3731 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
36%
Median delay
+26 min
90th percentile
+99 min
Cancellation rate
0%
How often is WN3731 on time?
Across 33 flights on STL → BOS from 2026-03-05 to 2026-04-06, WN3731 arrived within 15 minutes of schedule 36% of the time. The median arrival delay was +26 min, and the worst 10% of flights arrived +99 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 | 12 | 36% |
| 16-30 min | 8 | 24% |
| 31-60 min | 6 | 18% |
| 61-120 min | 4 | 12% |
| 2+ hrs | 3 | 9% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-03 | 27 | 37% | +48 min |
| 2026-04 | 6 | 33% | +15 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 5 | 40% |
| Tue | 4 | 25% |
| Wed | 4 | 0% |
| Thu | 5 | 60% |
| Fri | 5 | 40% |
| Sat | 5 | 80% |
| Sun | 5 | 0% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…