Flight OddsAA1239 BOS → ORD
American Airlines · Boston, MA to Chicago, IL · 165 flights observed, 2025-07-01 to 2026-06-30 · 867 mi
AA1239 covers more than one route in the data window — the stats below are for BOS → ORD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
91%
Median delay
-17 min
90th percentile
+13 min
Cancellation rate
0%
How often is AA1239 on time?
Across 165 flights on BOS → ORD from 2025-07-01 to 2026-06-30, AA1239 arrived within 15 minutes of schedule 91% of the time. The median arrival delay was -17 min, and the worst 10% of flights arrived +13 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 | 150 | 91% |
| 16-30 min | 8 | 5% |
| 31-60 min | 1 | 1% |
| 61-120 min | 2 | 1% |
| 2+ hrs | 4 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 87% | -7 min |
| 2025-08 | 31 | 90% | +1 min |
| 2025-09 | 30 | 90% | -13 min |
| 2025-10 | 31 | 87% | +13 min |
| 2025-11 | 1 | 100% | -13 min |
| 2026-05 | 11 | 91% | -13 min |
| 2026-06 | 30 | 100% | -21 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 23 | 91% |
| Tue | 24 | 96% |
| Wed | 23 | 91% |
| Thu | 24 | 96% |
| Fri | 24 | 96% |
| Sat | 24 | 83% |
| Sun | 23 | 83% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…