Carrier route record

ASPSC→SEA

Alaska Airlines · Pasco to Seattle

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 PSC to SEA lands a B, 6 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 276 flights, with a median arrival 8 minutes early.

Set against the rest of the country, Alaska's PSC to SEA record is 6 points better than the US average of 77.6%. That gap is worth roughly 55 fewer late arrivals for every thousand flights.

On time

83.1%

Arrivals under 15 minutes late, of 272 completed flights

Avg delay

75 min

Across delayed arrivals only, not all flights

Cancelled

1.45%

National rate is 1.81%

Whole route

88.3%

Every carrier on PSC to SEA, 1,819 flights

These figures cover 276 flights between July 2025 and June 2026. The median arrival is 8 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Carrier by carrier

Alaska against every carrier on PSC to SEA

Alaska flew 276 of the 1,819 flights on PSC to SEA, about 15% of it. Its 83.1% on time is 5 points worse than the route as a whole, which runs 88.3%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 89.2% to Alaska at 83.1%.

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.

On-time performance by carrier on PSC to SEA
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlines	1,543	89.2%	80 min	0.71%	A+
Alaska Airlines (this page)thin sample	276	83.1%	75 min	1.45%	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 21 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–8am32 flights81.2%
8am–11am194 flights87.5%
11am–2pm50 flights66.7%
2pm–5pm—
5pm–8pm—
8pm–5am—

Scale runs 60% to 95%. 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 66.7% on time against 87.5% for 8am–11am. 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 8am–11am window is the busiest, with 194 flights scheduled in it.

Across the year

Alaska on PSC to SEA through the year

Jul–Sep 202592 flights75.6%
Oct–Dec 2025103 flights85.3%
Jan–Mar 202681 flights88.8%

Scale runs 65% to 95%. 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 83.1% on time across 276 flights.

Alaska on PSC to SEA did not run the same all year. Its best quarter was Jan–Mar 2026 at 88.8% on time and its weakest Jul–Sep 2025 at 75.6%, a swing of 13 points on roughly 92 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Across the week, Wednesday is the strongest day at 91.9% on time and Friday the weakest at 76.3%. 16 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. Late-arriving aircraft accounts for 49% of the 3,459 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.

Late-arriving aircraft
49%
Carrier
29%
National Airspace System
20%
Extreme weather
2%

49% 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 3,459 reported delay minutes here, that single category outweighs weather by 26 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 3,459 reported delay minutes.

The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 87.5% on time here.

Cancellations sit at 1.45% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

5.5% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.

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 8am–11am window matters as much as it does.

The return leg is a different operation and performs like one: it runs 77.7% on time across 276 flights, 5 points below 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 PSC to SEA

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 83.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 272 completed flights over 12 months sit behind that.

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.

Key figures