Flight profile · Alaska Airlines
AS4
Seattle (SEA) to Washington (DCA) · scheduled 8:00 AM – 4:40 PM
How AS4 performs
1,096 operations, 2023-07-01 to 2026-06-30.
AS4 arrived on time 81.4% of the time, against 79.4% for all SEA → DCA flights — this specific departure is 2.0 percentage points better than the route as a whole. Against Alaska Airlines’s own flights on this route it is 4.7 points better.
Source: US DOT Bureau of Transportation Statistics · 1,096 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| AS4 | 81.4% | 0.55% | -8 min | 4.5% | 1,096 |
| Alaska Airlines on SEA → DCA | 76.7% | 0.69% | -5 min | 6.3% | 2,189 |
| All SEA → DCA flights | 79.4% | 0.97% | -7 min | 5.7% | 2,668 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does AS4 run worse on particular days?
Saturday is historically the most reliable day and Thursday the least, a gap of 21.2 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 1,096 records of AS4 operating SEA → DCA, 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.