Flight OddsAS818 SEA → BOS
Alaska Airlines · Seattle, WA to Boston, MA · 117 flights observed, 2025-07-01 to 2025-10-25 · 2,496 mi
AS818 covers more than one route in the data window — the stats below are for SEA → BOS, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
51%
Median delay
+15 min
90th percentile
+91 min
Cancellation rate
1%
How often is AS818 on time?
Across 117 flights on SEA → BOS from 2025-07-01 to 2025-10-25, AS818 arrived within 15 minutes of schedule 51% of the time. The median arrival delay was +15 min, and the worst 10% of flights arrived +91 min or later. 1% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 59 | 51% |
| 16-30 min | 16 | 14% |
| 31-60 min | 19 | 16% |
| 61-120 min | 19 | 16% |
| 2+ hrs | 3 | 3% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 48% | +30 min |
| 2025-08 | 31 | 42% | +25 min |
| 2025-09 | 30 | 53% | +39 min |
| 2025-10 | 24 | 63% | +11 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 16 | 44% |
| Tue | 17 | 65% |
| Wed | 17 | 59% |
| Thu | 17 | 41% |
| Fri | 16 | 50% |
| Sat | 17 | 59% |
| Sun | 16 | 38% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…