Flight OddsAS309 SJC → SEA
Alaska Airlines · San Jose, CA to Seattle, WA · 22 flights observed, 2025-10-04 to 2025-10-25 · 696 mi
AS309 covers more than one route in the data window — the stats below are for SJC → SEA, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
86%
Median delay
-11 min
90th percentile
+62 min
Cancellation rate
5%
How often is AS309 on time?
Across 22 flights on SJC → SEA from 2025-10-04 to 2025-10-25, AS309 arrived within 15 minutes of schedule 86% of the time. The median arrival delay was -11 min, and the worst 10% of flights arrived +62 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 | 18 | 86% |
| 16-30 min | 0 | 0% |
| 31-60 min | 0 | 0% |
| 61-120 min | 1 | 5% |
| 2+ hrs | 2 | 10% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-10 | 21 | 86% | +18 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 3 | 100% |
| Tue | 3 | 100% |
| Wed | 3 | 100% |
| Thu | 3 | 67% |
| Fri | 2 | 100% |
| Sat | 4 | 75% |
| Sun | 3 | 67% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…