Flight OddsAS1278 SEA → ONT
Alaska Airlines · Seattle, WA to Ontario, CA · 50 flights observed, 2025-07-01 to 2025-08-19 · 956 mi
On-time arrival
73%
Median delay
+6 min
90th percentile
+48 min
Cancellation rate
4%
How often is AS1278 on time?
Across 50 flights on SEA → ONT from 2025-07-01 to 2025-08-19, AS1278 arrived within 15 minutes of schedule 73% of the time. The median arrival delay was +6 min, and the worst 10% of flights arrived +48 min or later. 4% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 35 | 73% |
| 16-30 min | 7 | 15% |
| 31-60 min | 2 | 4% |
| 61-120 min | 4 | 8% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 29 | 69% | +11 min |
| 2025-08 | 19 | 79% | +13 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 6 | 83% |
| Tue | 8 | 38% |
| Wed | 7 | 57% |
| Thu | 7 | 71% |
| Fri | 7 | 86% |
| Sat | 6 | 100% |
| Sun | 7 | 86% |
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…