Carrier route record
ASSEA→PSC
Alaska Airlines · Seattle to Pasco
- Flights
- 276
- Period
- July 2025 to June 2026
- Share of route
- 15%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Alaska Airlines.
Alaska on SEA to PSC lands a B, level with the national rate of 77.6%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by roughly 40 minutes on average. That is a workable record, not a spotless one. That rests on 276 flights, with a median arrival 1 minute early.
The US average over the same twelve months is 77.6%, so there is little to separate Alaska on SEA to PSC from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
77.7%
Arrivals under 15 minutes late, of 269 completed flights
Avg delay
39 min
Across delayed arrivals only, not all flights
Cancelled
2.54%
National rate is 1.81%
Whole route
83.9%
Every carrier on SEA to PSC, 1,818 flights
These figures cover 276 flights between July 2025 and June 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
Carrier by carrier
Alaska against every carrier on SEA to PSC
Alaska flew 276 of the 1,818 flights on SEA to PSC, about 15% of it. Its 77.7% on time is 6 points worse than the route as a whole, which runs 83.9%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 84.9% to Alaska at 77.7%.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 1,542 | 84.9% | 66 min | 0.71% | B+ |
| Alaska Airlines (this page)thin sample | 276 | 77.7% | 39 min | 2.54% | B |
Departure window
When Alaska runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 17 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am—
- 8am–11am16 flights—
- 11am–2pm50 flights64.6%
- 2pm–5pm—
- 5pm–8pm1 flights—
- 8pm–5am209 flights81.9%
Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 64.6% on time against 81.9% for 8pm–5am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 8pm–5am window is the busiest, with 209 flights scheduled in it.
Across the year
Alaska on SEA to PSC through the year
- Jul–Sep 202593 flights79.1%
- Oct–Dec 2025103 flights76.0%
- Jan–Mar 202680 flights78.2%
Scale runs 70% to 85%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 77.7% on time across 276 flights.
Quarter by quarter Alaska on SEA to PSC held fairly steady: 79.1% in Jul–Sep 2025, 76.0% in Oct–Dec 2025 and 78.2% in Jan–Mar 2026. A spread of 3 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
Across the week, Wednesday is the strongest day at 85.7% on time and Sunday the weakest at 75.0%. 11 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Alaska runs late on this route
One category carries most of the weight here. Carrier accounts for 43% of the 2,335 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 43%Carrier
- 42%Late-arriving aircraft
- 15%National Airspace System
- 0%Extreme weather
42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 2,335 reported delay minutes here, that single category outweighs weather by 42 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 2,335 reported delay minutes.
The largest share of delay minutes, 43%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 996 of the 2,335 delay minutes reported here.
Cancellations run at 2.54%, against 1.81% nationally. That is about one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 3.0% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
At 172 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 8pm–5am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 83.1% on time across 276 flights, 5 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 5 points of difference.
One caution: this is a thin sample. 276 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Alaska on SEA to PSC
Put together: treat all of this as provisional. 276 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 77.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 269 completed flights over 12 months sit behind that.
Related
Where to go next
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.