Flight OddsWN3957 STL → MDW
Southwest Airlines · St. Louis, MO to Chicago, IL · 27 flights observed, 2026-06-04 to 2026-06-30 · 251 mi
WN3957 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
67%
Median delay
+3 min
90th percentile
+79 min
Cancellation rate
0%
How often is WN3957 on time?
Across 27 flights on STL → MDW from 2026-06-04 to 2026-06-30, WN3957 arrived within 15 minutes of schedule 67% of the time. The median arrival delay was +3 min, and the worst 10% of flights arrived +79 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 | 18 | 67% |
| 16-30 min | 3 | 11% |
| 31-60 min | 1 | 4% |
| 61-120 min | 4 | 15% |
| 2+ hrs | 1 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-06 | 27 | 67% | +19 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 4 | 50% |
| Tue | 4 | 75% |
| Wed | 3 | 33% |
| Thu | 4 | 75% |
| Fri | 4 | 100% |
| Sat | 4 | 50% |
| Sun | 4 | 75% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…