Flight OddsAS819 BOS → SEA
Alaska Airlines · Boston, MA to Seattle, WA · 117 flights observed, 2025-07-01 to 2025-10-25 · 2,496 mi
AS819 covers more than one route in the data window — the stats below are for BOS → SEA, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
54%
Median delay
+7 min
90th percentile
+100 min
Cancellation rate
2%
How often is AS819 on time?
Across 117 flights on BOS → SEA from 2025-07-01 to 2025-10-25, AS819 arrived within 15 minutes of schedule 54% of the time. The median arrival delay was +7 min, and the worst 10% of flights arrived +100 min or later. 2% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 62 | 54% |
| 16-30 min | 17 | 15% |
| 31-60 min | 10 | 9% |
| 61-120 min | 17 | 15% |
| 2+ hrs | 8 | 7% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 29 | 41% | +31 min |
| 2025-08 | 31 | 61% | +9 min |
| 2025-09 | 30 | 63% | +32 min |
| 2025-10 | 24 | 50% | +33 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 16 | 69% |
| Tue | 17 | 65% |
| Wed | 16 | 69% |
| Thu | 16 | 19% |
| Fri | 17 | 59% |
| Sat | 17 | 59% |
| Sun | 15 | 40% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…