Flight OddsUA4540 IAD → BTV
United Airlines · Washington, DC to Burlington, VT · 29 flights observed, 2025-10-26 to 2025-12-01 · 441 mi
UA4540 covers more than one route in the data window — the stats below are for IAD → BTV, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
64%
Median delay
+9 min
90th percentile
+204 min
Cancellation rate
3%
How often is UA4540 on time?
Across 29 flights on IAD → BTV from 2025-10-26 to 2025-12-01, UA4540 arrived within 15 minutes of schedule 64% of the time. The median arrival delay was +9 min, and the worst 10% of flights arrived +204 min or later. 3% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 18 | 64% |
| 16-30 min | 1 | 4% |
| 31-60 min | 2 | 7% |
| 61-120 min | 3 | 11% |
| 2+ hrs | 4 | 14% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-10 | 5 | 80% | +42 min |
| 2025-11 | 22 | 64% | +51 min |
| 2025-12 | 1 | 0% | +120 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 4 | 25% |
| Tue | 5 | 80% |
| Wed | 5 | 80% |
| Thu | 4 | 75% |
| Fri | 4 | 75% |
| Sat | No data | — |
| Sun | 6 | 50% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…