Carrier route record
ASSEA→EUG
Alaska Airlines · Seattle to Eugene
- Flights
- 265
- Period
- September 2025 to August 2026
- Share of route
- 14%
- 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 EUG lands a B, 4 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 265 flights, with a median arrival 6 minutes early.
Set against the rest of the country, Alaska's SEA to EUG record is 4 points better than the US average of 77.3%. That gap is worth roughly 40 fewer late arrivals for every thousand flights.
Key figures
On time
81.3%
Arrivals under 15 minutes late, of 262 completed flights
Avg delay
39 min
Across delayed arrivals only, not all flights
Cancelled
1.13%
National rate is 1.89%
Whole route
84.2%
Every carrier on SEA to EUG, 1,894 flights
These figures cover 265 flights between September 2025 and August 2026. The median arrival is 6 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 EUG
Alaska flew 265 of the 1,894 flights on SEA to EUG, about 14% of it. Its 81.3% on time is 3 points worse than the route as a whole, which runs 84.2%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 84.6% to Alaska at 81.3%.
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 | 1,629 | 84.6% | 64 min | 1.35% | B |
| Alaska Airlines (this page)thin sample | 265 | 81.3% | 39 min | 1.13% | 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 265 flights.
- 5am–8am—
- 8am–11am—
- 11am–2pm33 flights81.8%
- 2pm–5pm—
- 5pm–8pm37 flights86.5%
- 8pm–5am195 flights80.2%
Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is the strongest at 86.5% on time. The full set of windows spans 6 points.
Across the year
Alaska on SEA to EUG through the year
- Jul–Sep 202560 flights85.0%
- Oct–Dec 202594 flights71.7%
- Jan–Mar 202690 flights87.6%
- Apr–Jun 202621 flights—
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 81.3% on time across 265 flights.
Alaska on SEA to EUG did not run the same all year. Its best quarter was Jan–Mar 2026 at 87.6% on time and its weakest Oct–Dec 2025 at 71.7%, a swing of 16 points on roughly 88 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, Thursday is the strongest day at 97.2% on time and Monday the weakest at 74.4%, a spread of 23 points.
Arrival by arrival
How late Alaska on SEA to EUG runs when it is late
Alaska on SEA to EUG often beats the schedule: 71 of 262 completed flights, 27%, arrived 15 minutes or more early. Most of the lateness is short. 27 of the 49 late arrivals were under half an hour behind, and 9 reached an hour or more.
- 15+ min early71 flights27.1%
- Within 15 min142 flights54.2%
- 15–29 min late27 flights10.3%
- 30–59 min late13 flights5.0%
- 1–2 hours late8 flights3.1%
- 2+ hours late1 flights0.4%
Scale runs 0% to 100%.
Share of 262 completed flights by arrival against schedule.
15 of 55 late departures made up the time and arrived on time, 27% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for Alaska on SEA to EUG
The latest arrival of the period was on 22 September 2025, 3 hours 24 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 October 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 22 September 2025 | 3 hours 24 minutes | Carrier |
| 25 October 2025 | 1 hour 34 minutes | Carrier |
| 13 October 2025 | 1 hour 25 minutes | Late-arriving aircraft |
| 24 October 2025 | 1 hour 15 minutes | Late-arriving aircraft |
| 25 March 2026 | 1 hour 15 minutes | Carrier |
Delay causes
Why Alaska runs late on this route
Late-arriving aircraft accounts for 45% of the 1,901 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Late-arriving aircraft
- 44%Carrier
- 9%National Airspace System
- 1%Extreme weather
45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,901 reported delay minutes here, that single category outweighs weather by 39 to one. The split is drawn from 1,901 reported delay minutes.
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 843 of the 1,901 delay minutes reported here.
Cancellations sit at 1.13% 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 3.4% 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 234 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 5pm–8pm window matters as much as it does.
The return leg is a different operation and performs like one: it runs 91.2% on time across 265 flights, 10 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 10 points of difference.
One caution: this is a thin sample. 265 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 EUG
Put together: treat all of this as provisional. 265 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 81.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 262 completed flights over 12 months sit behind that.
Related
Where to go next
- SEA to EUG, every carrier
- Alaska on EUG to SEA, the return leg
- SkyWest Airlines on SEA to EUG84.6%
- Alaska Airlines network-wide record
- Seattle-Tacoma International (SEA) delay statistics
- Why the first flight of the morning is statistically safest
- How to read this site: grades, sample sizes, and honest caveats
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.