Flight profile · Alaska Airlines
AS535
Seattle (SEA) to Denver (DEN) · scheduled 10:20 AM – 2:07 PM
How AS535 performs
236 operations, 2025-06-12 to 2026-06-30.
AS535 arrived on time 71.9% of the time, against 78.3% for all SEA → DEN flights — this specific departure is 6.4 percentage points worse than the route as a whole. Against Alaska Airlines’s own flights on this route it is 3.6 points worse.
Source: US DOT Bureau of Transportation Statistics · 236 operations between 2025-06-12 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| AS535 | 71.9% | 1.27% | 0 min | 6.9% | 236 |
| Alaska Airlines on SEA → DEN | 75.5% | 0.74% | -2 min | 6.2% | 4,733 |
| All SEA → DEN flights | 78.3% | 0.77% | -5 min | 6.5% | 19,613 |
Source: FlyerIntel analysis of US DOT BTS data · 2025-06-12 to 2026-06-30
Other routes AS535 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.
Because the same number has served different journeys, the statistics above describe only the route AS535 currently operates. Blending them would produce an average of two different flights.
Why AS535 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding, fuelling — within the carrier’s control
airspace and airport capacity, including weather-driven flow control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for AS535 on SEA → DEN. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on SEA → DEN
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| AS682 | Alaska Airlines | 86.6% | 7 min early | 953 |
| UA757 | United Airlines | 84.4% | 9 min early | 1,096 |
| AS642 | Alaska Airlines | 76.0% | 2 min early | 662 |
| F93406 | Frontier Airlines | 75.9% | 3 min early | 623 |
| AS620 | Alaska Airlines | 73.1% | 2 min early | 731 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 236 records of AS535 operating SEA → DEN, 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.
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