Flight profile · Alaska Airlines
AS439
Houston (IAH) to Seattle (SEA) · scheduled 6:59 PM – 9:53 PM
How AS439 performs
1,062 operations, 2023-07-01 to 2026-06-30.
AS439 arrived on time 66.9% of the time, against 77.2% for all IAH → SEA flights — this specific departure is 10.3 percentage points worse than the route as a whole. Against Alaska Airlines’s own flights on this route it is 11.5 points worse.
Source: US DOT Bureau of Transportation Statistics · 1,062 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| AS439 | 66.9% | 1.22% | 2 min | 8.4% | 1,062 |
| Alaska Airlines on IAH → SEA | 78.4% | 1.48% | -5 min | 5.3% | 2,627 |
| All IAH → SEA flights | 77.2% | 1.19% | -4 min | 7.2% | 6,298 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does AS439 run worse on particular days?
Tuesday is historically the most reliable day and Monday the least, a gap of 8.3 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 1,062 records of AS439 operating IAH → 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.