Flight OddsAS306 SEA → BOS
Alaska Airlines · Seattle, WA to Boston, MA · 365 flights observed, 2025-07-01 to 2026-06-30 · 2,496 mi
AS306 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
75%
Median delay
0 min
90th percentile
+39 min
Cancellation rate
1%
How often is AS306 on time?
Across 365 flights on SEA → BOS from 2025-07-01 to 2026-06-30, AS306 arrived within 15 minutes of schedule 75% of the time. The median arrival delay was 0 min, and the worst 10% of flights arrived +39 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 | 271 | 75% |
| 16-30 min | 43 | 12% |
| 31-60 min | 23 | 6% |
| 61-120 min | 16 | 4% |
| 2+ hrs | 7 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 61% | +17 min |
| 2025-08 | 31 | 61% | +9 min |
| 2025-09 | 30 | 67% | +20 min |
| 2025-10 | 31 | 55% | +24 min |
| 2025-11 | 29 | 83% | +4 min |
| 2025-12 | 31 | 87% | -3 min |
| 2026-01 | 29 | 100% | -11 min |
| 2026-02 | 27 | 89% | -11 min |
| 2026-03 | 30 | 93% | +0 min |
| 2026-04 | 30 | 67% | +17 min |
| 2026-05 | 31 | 71% | +8 min |
| 2026-06 | 30 | 73% | +4 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 50 | 82% |
| Tue | 53 | 74% |
| Wed | 52 | 71% |
| Thu | 51 | 75% |
| Fri | 52 | 69% |
| Sat | 51 | 76% |
| Sun | 51 | 80% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…