Flight OddsWN3721 STL → MDW
Southwest Airlines · St. Louis, MO to Chicago, IL · 54 flights observed, 2025-11-02 to 2026-01-05 · 251 mi
WN3721 covers more than one route in the data window — the stats below are for STL → MDW, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
93%
Median delay
-9 min
90th percentile
+7 min
Cancellation rate
0%
How often is WN3721 on time?
Across 54 flights on STL → MDW from 2025-11-02 to 2026-01-05, WN3721 arrived within 15 minutes of schedule 93% of the time. The median arrival delay was -9 min, and the worst 10% of flights arrived +7 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 | 50 | 93% |
| 16-30 min | 2 | 4% |
| 31-60 min | 2 | 4% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-11 | 25 | 96% | -10 min |
| 2025-12 | 26 | 88% | -4 min |
| 2026-01 | 3 | 100% | -15 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 10 | 90% |
| Tue | 9 | 100% |
| Wed | 7 | 86% |
| Thu | 6 | 100% |
| Fri | 9 | 89% |
| Sat | 4 | 100% |
| Sun | 9 | 89% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…