Flight OddsAS338 BOS → SEA
Alaska Airlines · Boston, MA to Seattle, WA · 21 flights observed, 2026-06-10 to 2026-06-30 · 2,496 mi
AS338 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
95%
Median delay
-12 min
90th percentile
+9 min
Cancellation rate
5%
How often is AS338 on time?
Across 21 flights on BOS → SEA from 2026-06-10 to 2026-06-30, AS338 arrived within 15 minutes of schedule 95% of the time. The median arrival delay was -12 min, and the worst 10% of flights arrived +9 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 | 19 | 95% |
| 16-30 min | 1 | 5% |
| 31-60 min | 0 | 0% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-06 | 20 | 95% | -9 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 3 | 100% |
| Tue | 3 | 100% |
| Wed | 3 | 100% |
| Thu | 3 | 100% |
| Fri | 3 | 100% |
| Sat | 2 | 100% |
| 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…