Flight OddsAA3520 BOS → STL
American Airlines · Boston, MA to St. Louis, MO · 116 flights observed, 2025-11-02 to 2026-03-07 · 1,047 mi
AA3520 covers more than one route in the data window — the stats below are for BOS → STL, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
81%
Median delay
-10 min
90th percentile
+47 min
Cancellation rate
3%
How often is AA3520 on time?
Across 116 flights on BOS → STL from 2025-11-02 to 2026-03-07, AA3520 arrived within 15 minutes of schedule 81% of the time. The median arrival delay was -10 min, and the worst 10% of flights arrived +47 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 | 91 | 81% |
| 16-30 min | 6 | 5% |
| 31-60 min | 6 | 5% |
| 61-120 min | 8 | 7% |
| 2+ hrs | 1 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-11 | 27 | 85% | -1 min |
| 2025-12 | 28 | 75% | +1 min |
| 2026-01 | 24 | 88% | -3 min |
| 2026-02 | 26 | 81% | -5 min |
| 2026-03 | 7 | 71% | +9 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 16 | 69% |
| Tue | 18 | 83% |
| Wed | 18 | 89% |
| Thu | 16 | 81% |
| Fri | 18 | 89% |
| Sat | 10 | 70% |
| Sun | 16 | 81% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…