Flight OddsUA399 SEA → DEN
United Airlines · Seattle, WA to Denver, CO · 21 flights observed, 2026-02-12 to 2026-03-04 · 1,024 mi
UA399 covers more than one route in the data window — the stats below are for SEA → DEN, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
86%
Median delay
-18 min
90th percentile
+33 min
Cancellation rate
0%
How often is UA399 on time?
Across 21 flights on SEA → DEN from 2026-02-12 to 2026-03-04, UA399 arrived within 15 minutes of schedule 86% of the time. The median arrival delay was -18 min, and the worst 10% of flights arrived +33 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 | 18 | 86% |
| 16-30 min | 0 | 0% |
| 31-60 min | 2 | 10% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 1 | 5% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-02 | 17 | 82% | -3 min |
| 2026-03 | 4 | 100% | -20 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 3 | 100% |
| Tue | 3 | 67% |
| Wed | 3 | 67% |
| Thu | 3 | 100% |
| Fri | 3 | 67% |
| Sat | 3 | 100% |
| Sun | 3 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…