Carrier route record
ASSEA→PSC
Alaska Airlines · Seattle to Pasco
- Flights
- 213
- Period
- September 2025 to August 2026
- Share of route
- 13%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Alaska Airlines.
Alaska on SEA to PSC lands a B, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 40 minutes on average. That rests on 213 flights, with a median arrival 2 minutes early.
The US average over the same twelve months is 77.3%, 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
79.3%
Arrivals under 15 minutes late, of 208 completed flights
Avg delay
38 min
Across delayed arrivals only, not all flights
Cancelled
2.35%
National rate is 1.89%
Whole route
83.3%
Every carrier on SEA to PSC, 1,678 flights
These figures cover 213 flights between September 2025 and August 2026. The median arrival is 2 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.
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Carrier by carrier
Alaska against every carrier on SEA to PSC
Alaska flew 213 of the 1,678 flights on SEA to PSC, about 13% of it. Its 79.3% on time is 4 points worse than the route as a whole, which runs 83.3%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 83.8% to Alaska at 79.3%.
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 | 1,465 | 83.8% | 65 min | 0.75% | B+ |
| Alaska Airlines (this page)thin sample | 213 | 79.3% | 38 min | 2.35% | B |
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Departure window
When Alaska runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 213 flights.
There are not enough flights in each departure window to split Alaska's SEA to PSC record by time of day without the percentages moving on noise. The headline rate of 79.3% is the reliable figure here.
Across the year
Alaska on SEA to PSC through the year
- Jul–Sep 202530 flights93.3%
- Oct–Dec 2025103 flights76.0%
- Jan–Mar 202680 flights78.2%
Scale runs 70% to 100%.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 79.3% on time across 213 flights.
Alaska on SEA to PSC did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Oct–Dec 2025 at 76.0%, a swing of 17 points on roughly 71 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, Tuesday is the strongest day at 83.9% on time and Monday the weakest at 68.8%, a spread of 15 points.
Arrival by arrival
How late Alaska on SEA to PSC runs when it is late
Most of the lateness is short. 25 of the 43 late arrivals were under half an hour behind, and 5 reached an hour or more.
- 15+ min early26 flights12.5%
- Within 15 min139 flights66.8%
- 15–29 min late25 flights12.0%
- 30–59 min late13 flights6.3%
- 1–2 hours late4 flights1.9%
- 2+ hours late1 flights0.5%
Scale runs 0% to 100%.
Share of 208 completed flights by arrival against schedule.
8 of 43 late departures made up the time and arrived on time, 19% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for Alaska on SEA to PSC
The latest arrival of the period was on 6 January 2026, 3 hours 10 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in January 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 6 January 2026 | 3 hours 10 minutes | Carrier |
| 2 March 2026 | 1 hour 53 minutes | Carrier |
| 5 January 2026 | 1 hour 49 minutes | Late-arriving aircraft |
| 25 December 2025 | 1 hour 2 minutes | Carrier |
| 3 January 2026 | 1 hour 1 minute | National Airspace System |
Delay causes
Why Alaska runs late on this route
Carrier accounts for 44% of the 1,617 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Carrier
- 41%Late-arriving aircraft
- 15%National Airspace System
- 0%Extreme weather
41% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,617 reported delay minutes here, that single category outweighs weather by 41 to one. The split is drawn from 1,617 reported delay minutes.
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 704 of the 1,617 delay minutes reported here.
Cancellations sit at 2.35% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 2.4% land an hour or more behind schedule, against 8.3% 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 85.8% on time across 214 flights, 7 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 7 points of difference.
One caution: this is a thin sample. 213 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. 213 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 79.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 208 completed flights over 12 months sit behind that.
Related
Where to go next
- SEA to PSC, every carrier
- Alaska on PSC to SEA, the return leg
- SkyWest Airlines on SEA to PSC83.8%
- Alaska Airlines network-wide record
- Seattle-Tacoma International (SEA) delay statistics
- Why the first flight of the morning is statistically safest
- The best day of the week to fly, and why it is the second lever
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.