Flight profile · Alaska Airlines
AS134
Anchorage (ANC) to Seattle (SEA) · scheduled 5:00 PM – 9:32 PM
How AS134 performs
340 operations, 2024-01-08 to 2026-04-21.
AS134 arrived on time 81.5% of the time, against 84.9% for all ANC → SEA flights — this specific departure is 3.3 percentage points worse than the route as a whole. Against Alaska Airlines’s own flights on this route it is 2.2 points worse.
Source: US DOT Bureau of Transportation Statistics · 340 operations between 2024-01-08 to 2026-04-21
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| AS134 | 81.5% | 1.18% | -8 min | 6.8% | 340 |
| Alaska Airlines on ANC → SEA | 83.7% | 1.01% | -6 min | 3.4% | 16,554 |
| All ANC → SEA flights | 84.9% | 0.87% | -8 min | 3.6% | 21,631 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-01-08 to 2026-04-21
Other routes AS134 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 |
|---|---|---|---|
| ORD→ANC Chicago to Anchorage | 2025-05-15 – 2025-06-11 | 28 | — |
| PDX→PHX Portland to Phoenix | 2025-02-13 – 2025-04-21 | 68 | — |
| PDX→LAS Portland to Las Vegas | 2024-10-03 – 2025-01-05 | 43 | — |
| LAS→SFO Las Vegas to San Francisco | 2024-11-02 – 2024-11-16 | 3 | — |
| SEA→ANC Seattle to Anchorage | 2024-06-16 – 2024-08-18 | 10 | — |
| AKN→ANC King Salmon to Anchorage | 2023-07-22 – 2023-07-30 | 4 | — |
Because the same number has served different journeys, the statistics above describe only the route AS134 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
43 min late
against a median of 7 min early
Percentiles over 340 operations. Cancelled and diverted flights have no arrival time and are counted separately rather than as very late arrivals.
Why AS134 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding, fuelling — within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for AS134 on ANC → SEA. 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 ANC → SEA
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL853 | Delta Air Lines | 91.7% | 15 min early | 1,030 |
| DL922 | Delta Air Lines | 90.9% | 19 min early | 722 |
| AS188 | Alaska Airlines | 90.2% | 9 min early | 873 |
| DL925 | Delta Air Lines | 88.6% | 17 min early | 964 |
| AS48 | Alaska Airlines | 88.1% | 9 min early | 904 |
| AS82 | Alaska Airlines | 84.5% | 5 min early | 677 |
| AS56 | Alaska Airlines | 84.2% | 6 min early | 610 |
| AS226 | Alaska Airlines | 80.3% | 3 min early | 677 |
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 340 records of AS134 operating ANC → 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.
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