Flight OddsUA4020 BUF → IAD
United Airlines · Buffalo, NY to Washington, DC · 19 flights observed, 2025-10-27 to 2025-12-01 · 283 mi
UA4020 covers more than one route in the data window — the stats below are for BUF → IAD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
72%
Median delay
-1 min
90th percentile
+120 min
Cancellation rate
5%
How often is UA4020 on time?
Across 19 flights on BUF → IAD from 2025-10-27 to 2025-12-01, UA4020 arrived within 15 minutes of schedule 72% of the time. The median arrival delay was -1 min, and the worst 10% of flights arrived +120 min or later. 5% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 13 | 72% |
| 16-30 min | 1 | 6% |
| 31-60 min | 1 | 6% |
| 61-120 min | 1 | 6% |
| 2+ hrs | 2 | 11% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-10 | 4 | 100% | -9 min |
| 2025-11 | 13 | 69% | +30 min |
| 2025-12 | 1 | 0% | +223 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 5 | 60% |
| Tue | 5 | 80% |
| Wed | No data | — |
| Thu | 5 | 60% |
| Fri | 3 | 100% |
| Sat | No data | — |
| Sun | No data | — |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…