Flight OddsAA3991 CHA → ORD
American Airlines · Chattanooga, TN to Chicago, IL · 31 flights observed, 2026-04-07 to 2026-05-07 · 501 mi
AA3991 covers more than one route in the data window — the stats below are for CHA → ORD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
87%
Median delay
-14 min
90th percentile
+18 min
Cancellation rate
0%
How often is AA3991 on time?
Across 31 flights on CHA → ORD from 2026-04-07 to 2026-05-07, AA3991 arrived within 15 minutes of schedule 87% of the time. The median arrival delay was -14 min, and the worst 10% of flights arrived +18 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 | 27 | 87% |
| 16-30 min | 1 | 3% |
| 31-60 min | 1 | 3% |
| 61-120 min | 2 | 6% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-04 | 24 | 83% | -4 min |
| 2026-05 | 7 | 100% | -20 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 4 | 50% |
| Tue | 5 | 80% |
| Wed | 5 | 100% |
| Thu | 5 | 100% |
| Fri | 4 | 75% |
| Sat | 4 | 100% |
| Sun | 4 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…