Flight OddsWN4009 MDW → STL
Southwest Airlines · Chicago, IL to St. Louis, MO · 15 flights observed, 2026-03-05 to 2026-04-06 · 251 mi
WN4009 covers more than one route in the data window — the stats below are for MDW → STL, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
64%
Median delay
-2 min
90th percentile
+121 min
Cancellation rate
7%
How often is WN4009 on time?
Across 15 flights on MDW → STL from 2026-03-05 to 2026-04-06, WN4009 arrived within 15 minutes of schedule 64% of the time. The median arrival delay was -2 min, and the worst 10% of flights arrived +121 min or later. 7% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 9 | 64% |
| 16-30 min | 0 | 0% |
| 31-60 min | 1 | 7% |
| 61-120 min | 2 | 14% |
| 2+ hrs | 2 | 14% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-03 | 12 | 67% | +22 min |
| 2026-04 | 2 | 50% | +129 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 5 | 80% |
| Tue | No data | — |
| Wed | No data | — |
| Thu | 5 | 60% |
| Fri | 4 | 50% |
| Sat | No data | — |
| Sun | No data | — |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…