Flight OddsUA539 BOS → IAD
United Airlines · Boston, MA to Washington, DC · 31 flights observed, 2025-07-01 to 2025-07-31 · 412 mi
UA539 covers more than one route in the data window — the stats below are for BOS → IAD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
52%
Median delay
+12 min
90th percentile
+311 min
Cancellation rate
0%
How often is UA539 on time?
Across 31 flights on BOS → IAD from 2025-07-01 to 2025-07-31, UA539 arrived within 15 minutes of schedule 52% of the time. The median arrival delay was +12 min, and the worst 10% of flights arrived +311 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 | 16 | 52% |
| 16-30 min | 2 | 6% |
| 31-60 min | 3 | 10% |
| 61-120 min | 2 | 6% |
| 2+ hrs | 8 | 26% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 52% | +78 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 4 | 50% |
| Tue | 5 | 40% |
| Wed | 5 | 80% |
| Thu | 5 | 20% |
| Fri | 4 | 25% |
| Sat | 4 | 75% |
| Sun | 4 | 75% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…