Flight OddsIAD → BOS United Airlines
United Airlines · Washington, DC to Boston, MA · 1,462 flights, 2025-07-01 to 2026-06-30 · aggregated across 14 flight numbers
On-time arrival
78%
Median delay
-5 min
90th percentile
+54 min
Cancellation rate
2%
How on-time is United Airlines from IAD to BOS?
Across every United Airlines flight number on IAD → BOS (1,462 flights, 2025-07-01 to 2026-06-30), 78% arrived within 15 minutes of schedule. Median arrival delay -5 min; the worst 10% ran +54 min or later. 2% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 1,119 | 78% |
| 16-30 min | 95 | 7% |
| 31-60 min | 87 | 6% |
| 61-120 min | 74 | 5% |
| 2+ hrs | 59 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 122 | 71% | +37 min |
| 2025-08 | 134 | 81% | +4 min |
| 2025-09 | 140 | 59% | +24 min |
| 2025-10 | 123 | 76% | +17 min |
| 2025-11 | 117 | 78% | +3 min |
| 2025-12 | 122 | 78% | +8 min |
| 2026-01 | 104 | 88% | +3 min |
| 2026-02 | 95 | 86% | +1 min |
| 2026-03 | 117 | 80% | +10 min |
| 2026-04 | 120 | 83% | 0 min |
| 2026-05 | 123 | 81% | +3 min |
| 2026-06 | 117 | 82% | +1 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 204 | 74% |
| Tue | 203 | 77% |
| Wed | 201 | 80% |
| Thu | 208 | 74% |
| Fri | 212 | 80% |
| Sat | 204 | 87% |
| Sun | 202 | 75% |
UA flight numbers on IAD → BOS
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…