Flight OddsUA641 IAD → BOS
United Airlines · Washington, DC to Boston, MA · 344 flights observed, 2025-07-01 to 2026-06-30 · 412 mi
UA641 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
92%
Median delay
-11 min
90th percentile
+11 min
Cancellation rate
1%
How often is UA641 on time?
Across 344 flights on IAD → BOS from 2025-07-01 to 2026-06-30, UA641 arrived within 15 minutes of schedule 92% of the time. The median arrival delay was -11 min, and the worst 10% of flights arrived +11 min or later. 1% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 312 | 92% |
| 16-30 min | 11 | 3% |
| 31-60 min | 4 | 1% |
| 61-120 min | 10 | 3% |
| 2+ hrs | 2 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 87% | -1 min |
| 2025-08 | 31 | 87% | -4 min |
| 2025-09 | 30 | 93% | -9 min |
| 2025-10 | 31 | 90% | +2 min |
| 2025-11 | 30 | 97% | -10 min |
| 2025-12 | 31 | 87% | -1 min |
| 2026-01 | 16 | 88% | -2 min |
| 2026-02 | 21 | 100% | -10 min |
| 2026-03 | 28 | 96% | -3 min |
| 2026-04 | 30 | 90% | -8 min |
| 2026-05 | 31 | 94% | -7 min |
| 2026-06 | 29 | 97% | -12 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 49 | 86% |
| Tue | 43 | 91% |
| Wed | 46 | 93% |
| Thu | 52 | 96% |
| Fri | 52 | 90% |
| Sat | 47 | 94% |
| Sun | 50 | 94% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…