Carrier route record
ASEUG→SEA
Alaska Airlines · Eugene to Seattle
- 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 EUG to SEA earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 50 minutes. That rests on 265 flights, with a median arrival 9 minutes early.
Set against the rest of the country, Alaska's EUG to SEA record is 14 points better than the US average of 77.3%. That gap is worth roughly 139 fewer late arrivals for every thousand flights.
Key figures
On time
91.2%
Arrivals under 15 minutes late, of 262 completed flights
Avg delay
50 min
Across delayed arrivals only, not all flights
Cancelled
1.13%
National rate is 1.89%
Whole route
87.5%
Every carrier on EUG to SEA, 1,897 flights
These figures cover 265 flights between September 2025 and August 2026. The median arrival is 9 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 EUG to SEA
Alaska flew 265 of the 1,897 flights on EUG to SEA, about 14% of it. Its 91.2% on time is 4 points better than the route as a whole, which runs 87.5%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from Alaska at 91.2% to SkyWest at 86.9%.
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 |
|---|---|---|---|---|---|
| Alaska Airlines (this page)thin sample | 265 | 91.2% | 50 min | 1.13% | A |
| SkyWest Airlines | 1,632 | 86.9% | 68 min | 1.41% | A |
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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–8am63 flights90.5%
- 8am–11am169 flights92.2%
- 11am–2pm33 flights87.9%
- 2pm–5pm—
- 5pm–8pm—
- 8pm–5am—
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
The early departures do better, though not dramatically: 92.2% on time for the 8am–11am window against 87.9% for 11am–2pm. Worth taking if the schedule allows, not worth an extra connection. The 8am–11am window is the busiest, with 169 flights scheduled in it.
Across the year
Alaska on EUG to SEA through the year
- Jul–Sep 202560 flights90.0%
- Oct–Dec 202594 flights89.2%
- Jan–Mar 202690 flights93.2%
- Apr–Jun 202621 flights—
Scale runs 80% to 100%. 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 91.2% on time across 265 flights.
Quarter by quarter Alaska on EUG to SEA held fairly steady: 90.0% in Jul–Sep 2025, 89.2% in Oct–Dec 2025 and 93.2% in Jan–Mar 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
Across the week, Monday is the strongest day at 97.4% on time and Friday the weakest at 82.9%, a spread of 15 points.
Arrival by arrival
How late Alaska on EUG to SEA runs when it is late
Alaska on EUG to SEA often beats the schedule: 84 of 262 completed flights, 32%, arrived 15 minutes or more early. The 23 late arrivals split 11 under half an hour, 9 between 30 and 60 minutes, and 3 an hour or more.
- 15+ min early84 flights32.1%
- Within 15 min155 flights59.2%
- 15–29 min late11 flights4.2%
- 30–59 min late9 flights3.4%
- 1–2 hours late1 flights0.4%
- 2+ hours late2 flights0.8%
Scale runs 0% to 100%.
Share of 262 completed flights by arrival against schedule.
A late pushback is often recovered here: of 20 departures that left 15 minutes late or more, 7 still arrived on time. 10 flights left on time and still arrived late.
The worst days
Worst days for Alaska on EUG to SEA
The latest arrival of the period was on 25 September 2025, 3 hours 56 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across September, February, December and October, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 25 September 2025 | 3 hours 56 minutes | Carrier |
| 22 September 2025 | 3 hours 32 minutes | Late-arriving aircraft |
| 18 February 2026 | 1 hour 41 minutes | Carrier |
| 12 December 2025 | 59 minutes | National Airspace System |
| 12 October 2025 | 50 minutes | National Airspace System |
Delay causes
Why Alaska runs late on this route
Carrier accounts for 50% of the 1,143 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Carrier
- 28%National Airspace System
- 22%Late-arriving aircraft
The largest share of delay minutes, 50%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 570 of the 1,143 delay minutes reported here. The split is drawn from 1,143 reported delay minutes.
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 1.1% 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 8am–11am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 81.3% on time across 265 flights, 10 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 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 EUG to SEA
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 91.2% 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
- EUG to SEA, every carrier
- Alaska on SEA to EUG, the return leg
- SkyWest Airlines on EUG to SEA86.9%
- Alaska Airlines network-wide record
- Seattle-Tacoma International (SEA) delay statistics
- How to read this site: grades, sample sizes, and honest caveats
- 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.