Flight OddsAS621 DEN → SEA
Alaska Airlines · Denver, CO to Seattle, WA · 45 flights observed, 2025-08-20 to 2025-10-03 · 1,024 mi
AS621 covers more than one route in the data window — the stats below are for DEN → SEA, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
58%
Median delay
-1 min
90th percentile
+56 min
Cancellation rate
0%
How often is AS621 on time?
Across 45 flights on DEN → SEA from 2025-08-20 to 2025-10-03, AS621 arrived within 15 minutes of schedule 58% of the time. The median arrival delay was -1 min, and the worst 10% of flights arrived +56 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 | 26 | 58% |
| 16-30 min | 3 | 7% |
| 31-60 min | 11 | 24% |
| 61-120 min | 4 | 9% |
| 2+ hrs | 1 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-08 | 12 | 33% | +27 min |
| 2025-09 | 30 | 63% | +14 min |
| 2025-10 | 3 | 100% | -6 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 6 | 67% |
| Tue | 6 | 33% |
| Wed | 7 | 86% |
| Thu | 7 | 43% |
| Fri | 7 | 57% |
| Sat | 6 | 50% |
| Sun | 6 | 67% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…