Flight OddsAA4638 BOS → DCA
American Airlines · Boston, MA to Washington, DC · 27 flights observed, 2025-07-06 to 2025-08-05 · 399 mi
AA4638 covers more than one route in the data window — the stats below are for BOS → DCA, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
96%
Median delay
-13 min
90th percentile
+3 min
Cancellation rate
4%
How often is AA4638 on time?
Across 27 flights on BOS → DCA from 2025-07-06 to 2025-08-05, AA4638 arrived within 15 minutes of schedule 96% of the time. The median arrival delay was -13 min, and the worst 10% of flights arrived +3 min or later. 4% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 25 | 96% |
| 16-30 min | 0 | 0% |
| 31-60 min | 0 | 0% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 1 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 23 | 96% | -1 min |
| 2025-08 | 3 | 100% | -12 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 5 | 100% |
| Tue | 5 | 80% |
| Wed | 4 | 100% |
| Thu | 4 | 100% |
| Fri | 3 | 100% |
| Sat | No data | — |
| Sun | 5 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…