Flight OddsAA4678 STL → BOS
American Airlines · St. Louis, MO to Boston, MA · 40 flights observed, 2026-05-21 to 2026-06-30 · 1,047 mi
AA4678 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
64%
Median delay
-7 min
90th percentile
+71 min
Cancellation rate
3%
How often is AA4678 on time?
Across 40 flights on STL → BOS from 2026-05-21 to 2026-06-30, AA4678 arrived within 15 minutes of schedule 64% of the time. The median arrival delay was -7 min, and the worst 10% of flights arrived +71 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 | 25 | 64% |
| 16-30 min | 4 | 10% |
| 31-60 min | 4 | 10% |
| 61-120 min | 4 | 10% |
| 2+ hrs | 2 | 5% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-05 | 10 | 60% | +6 min |
| 2026-06 | 29 | 66% | +39 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 6 | 83% |
| Tue | 6 | 50% |
| Wed | 5 | 80% |
| Thu | 6 | 33% |
| Fri | 6 | 83% |
| Sat | 5 | 80% |
| Sun | 5 | 40% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…