Flight OddsUA2321 IAD → BOS
United Airlines · Washington, DC to Boston, MA · 31 flights observed, 2025-09-25 to 2025-10-25 · 412 mi
UA2321 covers more than one route in the data window — the stats below are for IAD → BOS, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
84%
Median delay
-3 min
90th percentile
+36 min
Cancellation rate
0%
How often is UA2321 on time?
Across 31 flights on IAD → BOS from 2025-09-25 to 2025-10-25, UA2321 arrived within 15 minutes of schedule 84% of the time. The median arrival delay was -3 min, and the worst 10% of flights arrived +36 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 | 26 | 84% |
| 16-30 min | 1 | 3% |
| 31-60 min | 2 | 6% |
| 61-120 min | 1 | 3% |
| 2+ hrs | 1 | 3% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-09 | 6 | 67% | 0 min |
| 2025-10 | 25 | 88% | +7 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 4 | 75% |
| Tue | 4 | 75% |
| Wed | 4 | 100% |
| Thu | 5 | 80% |
| Fri | 5 | 100% |
| Sat | 5 | 100% |
| Sun | 4 | 50% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…