Flight profile · Alaska Airlines
AS21
New York (JFK) to Seattle (SEA) · scheduled 9:30 AM – 12:50 PM
How AS21 performs
937 operations, 2023-07-01 to 2026-06-30.
Source: US DOT Bureau of Transportation Statistics · 937 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| AS21 | 76.7% | 2.03% | -7 min | 6.6% | 937 |
| Alaska Airlines on JFK → SEA | 76.9% | 2.07% | -7 min | 7.1% | 4,099 |
| All JFK → SEA flights | 76.7% | 1.71% | -7 min | 7.4% | 8,844 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does AS21 run worse on particular days?
Tuesday is historically the most reliable day and Thursday the least, a gap of 13.4 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Data and methodology
Calculated by FlyerIntel from 937 records of AS21 operating JFK → SEA, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.