Flight OddsAA3520 STL → BOS
American Airlines · St. Louis, MO to Boston, MA · 20 flights observed, 2026-02-12 to 2026-03-06 · 1,047 mi
AA3520 covers more than one route in the data window — the stats below are for STL → BOS, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
78%
Median delay
-12 min
90th percentile
+71 min
Cancellation rate
10%
How often is AA3520 on time?
Across 20 flights on STL → BOS from 2026-02-12 to 2026-03-06, AA3520 arrived within 15 minutes of schedule 78% of the time. The median arrival delay was -12 min, and the worst 10% of flights arrived +71 min or later. 10% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 14 | 78% |
| 16-30 min | 0 | 0% |
| 31-60 min | 0 | 0% |
| 61-120 min | 4 | 22% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-02 | 12 | 83% | +1 min |
| 2026-03 | 6 | 67% | +15 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 2 | 50% |
| Tue | 3 | 100% |
| Wed | 3 | 100% |
| Thu | 4 | 75% |
| Fri | 4 | 50% |
| Sat | No data | — |
| Sun | 2 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…