Flight profile · Alaska Airlines
AS443
Philadelphia (PHL) to Seattle (SEA) · scheduled 6:59 PM – 10:00 PM
How AS443 performs
1,047 operations, 2023-07-01 to 2026-06-30.
AS443 arrived on time 62.9% of the time, against 70.2% for all PHL → SEA flights — this specific departure is 7.2 percentage points worse than the route as a whole. Against Alaska Airlines’s own flights on this route it is 6.7 points worse.
Source: US DOT Bureau of Transportation Statistics · 1,047 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| AS443 | 62.9% | 1.91% | 5 min | 10.1% | 1,047 |
| Alaska Airlines on PHL → SEA | 69.6% | 1.26% | -1 min | 7.7% | 1,907 |
| All PHL → SEA flights | 70.2% | 1.57% | -2 min | 7.8% | 3,431 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does AS443 run worse on particular days?
Tuesday is historically the most reliable day and Thursday the least, a gap of 21.8 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.
Other routes AS443 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| DFW→SEA Dallas–Fort Worth to Seattle | 2026-05-13 – 2026-06-09 | 28 | — |
Because the same number has served different journeys, the statistics above describe only the route AS443 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 1,047 records of AS443 operating PHL → 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.