Flight OddsWN635 STL → MDW
Southwest Airlines · St. Louis, MO to Chicago, IL · 17 flights observed, 2025-10-04 to 2025-11-01 · 251 mi
WN635 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
65%
Median delay
-1 min
90th percentile
+51 min
Cancellation rate
0%
How often is WN635 on time?
Across 17 flights on STL → MDW from 2025-10-04 to 2025-11-01, WN635 arrived within 15 minutes of schedule 65% of the time. The median arrival delay was -1 min, and the worst 10% of flights arrived +51 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 | 11 | 65% |
| 16-30 min | 3 | 18% |
| 31-60 min | 1 | 6% |
| 61-120 min | 2 | 12% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-10 | 16 | 63% | +13 min |
| 2025-11 | 1 | 100% | -17 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | No data | — |
| Tue | 4 | 50% |
| Wed | 4 | 75% |
| Thu | No data | — |
| Fri | No data | — |
| Sat | 5 | 80% |
| Sun | 4 | 50% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…