Flight OddsAA439 STL → ORD
American Airlines · St. Louis, MO to Chicago, IL · 35 flights observed, 2025-07-01 to 2025-08-05 · 258 mi
AA439 covers more than one route in the data window — the stats below are for STL → ORD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
88%
Median delay
-12 min
90th percentile
+17 min
Cancellation rate
3%
How often is AA439 on time?
Across 35 flights on STL → ORD from 2025-07-01 to 2025-08-05, AA439 arrived within 15 minutes of schedule 88% of the time. The median arrival delay was -12 min, and the worst 10% of flights arrived +17 min or later. 3% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 30 | 88% |
| 16-30 min | 1 | 3% |
| 31-60 min | 2 | 6% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 1 | 3% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 29 | 93% | -9 min |
| 2025-08 | 5 | 60% | +31 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 5 | 80% |
| Tue | 6 | 100% |
| Wed | 5 | 100% |
| Thu | 5 | 100% |
| Fri | 5 | 80% |
| Sat | 3 | 67% |
| Sun | 5 | 80% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…