Flight OddsAS351 IAD → SEA
Alaska Airlines · Washington, DC to Seattle, WA · 306 flights observed, 2025-07-01 to 2026-06-09 · 2,305 mi
AS351 covers more than one route in the data window — the stats below are for IAD → SEA, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
81%
Median delay
-9 min
90th percentile
+35 min
Cancellation rate
1%
How often is AS351 on time?
Across 306 flights on IAD → SEA from 2025-07-01 to 2026-06-09, AS351 arrived within 15 minutes of schedule 81% of the time. The median arrival delay was -9 min, and the worst 10% of flights arrived +35 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 | 247 | 81% |
| 16-30 min | 24 | 8% |
| 31-60 min | 18 | 6% |
| 61-120 min | 11 | 4% |
| 2+ hrs | 4 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 97% | -13 min |
| 2025-08 | 31 | 100% | -18 min |
| 2025-09 | 30 | 97% | -20 min |
| 2025-10 | 30 | 87% | -2 min |
| 2025-11 | 29 | 69% | +10 min |
| 2025-12 | 30 | 30% | +32 min |
| 2026-01 | 6 | 33% | +29 min |
| 2026-02 | 16 | 81% | -1 min |
| 2026-03 | 31 | 71% | +16 min |
| 2026-04 | 30 | 87% | +0 min |
| 2026-05 | 31 | 97% | -10 min |
| 2026-06 | 9 | 100% | -23 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 44 | 80% |
| Tue | 45 | 80% |
| Wed | 43 | 84% |
| Thu | 43 | 81% |
| Fri | 43 | 81% |
| Sat | 44 | 82% |
| Sun | 42 | 81% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…