Flight OddsUA599 IAD → DEN
United Airlines · Washington, DC to Denver, CO · 227 flights observed, 2025-10-26 to 2026-06-30 · 1,452 mi
UA599 covers more than one route in the data window — the stats below are for IAD → DEN, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
75%
Median delay
-1 min
90th percentile
+71 min
Cancellation rate
0%
How often is UA599 on time?
Across 227 flights on IAD → DEN from 2025-10-26 to 2026-06-30, UA599 arrived within 15 minutes of schedule 75% of the time. The median arrival delay was -1 min, and the worst 10% of flights arrived +71 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 | 169 | 75% |
| 16-30 min | 22 | 10% |
| 31-60 min | 9 | 4% |
| 61-120 min | 15 | 7% |
| 2+ hrs | 11 | 5% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-10 | 6 | 67% | +1 min |
| 2025-11 | 30 | 87% | -4 min |
| 2025-12 | 31 | 68% | +21 min |
| 2026-01 | 30 | 70% | +12 min |
| 2026-02 | 11 | 82% | -10 min |
| 2026-03 | 27 | 74% | +22 min |
| 2026-04 | 30 | 87% | +9 min |
| 2026-05 | 31 | 77% | +18 min |
| 2026-06 | 30 | 60% | +43 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 33 | 73% |
| Tue | 33 | 85% |
| Wed | 32 | 75% |
| Thu | 32 | 84% |
| Fri | 32 | 59% |
| Sat | 32 | 75% |
| Sun | 32 | 72% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…