Flight OddsWN1837 STL → MDW
Southwest Airlines · St. Louis, MO to Chicago, IL · 55 flights observed, 2026-01-06 to 2026-03-04 · 251 mi
WN1837 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
96%
Median delay
-12 min
90th percentile
+7 min
Cancellation rate
2%
How often is WN1837 on time?
Across 55 flights on STL → MDW from 2026-01-06 to 2026-03-04, WN1837 arrived within 15 minutes of schedule 96% of the time. The median arrival delay was -12 min, and the worst 10% of flights arrived +7 min or later. 2% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 52 | 96% |
| 16-30 min | 0 | 0% |
| 31-60 min | 2 | 4% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-01 | 25 | 96% | -7 min |
| 2026-02 | 25 | 96% | -9 min |
| 2026-03 | 4 | 100% | -5 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 7 | 86% |
| Tue | 9 | 100% |
| Wed | 9 | 89% |
| Thu | 8 | 100% |
| Fri | 8 | 100% |
| Sat | 5 | 100% |
| Sun | 8 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…