Carrier route record

ASEUG→SEA

Alaska Airlines · Eugene to Seattle

Flights: 389
Period: July 2025 to June 2026
Share of route: 20%
Carriers: 2

Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Alaska Airlines.

Alaska on EUG to SEA earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 389 flights, with a median arrival 7 minutes early.

Set against the rest of the country, Alaska's EUG to SEA record is 9 points better than the US average of 77.6%. That gap is worth roughly 86 fewer late arrivals for every thousand flights.

On time

86.2%

Arrivals under 15 minutes late, of 384 completed flights

Avg delay

53 min

Across delayed arrivals only, not all flights

Cancelled

1.29%

National rate is 1.81%

Whole route

87.8%

Every carrier on EUG to SEA, 1,954 flights

These figures cover 389 flights between July 2025 and June 2026. The median arrival is 7 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 EUG to SEA

Alaska flew 389 of the 1,954 flights on EUG to SEA, about 20% of it. Its 86.2% on time is 2 points worse than the route as a whole, which runs 87.8%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 88.3% to Alaska at 86.2%.

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 EUG to SEA
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlines	1,565	88.3%	65 min	1.41%	A
Alaska Airlines (this page)	389	86.2%	53 min	1.29%	A

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 23 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–8am125 flights91.1%
8am–11am170 flights92.2%
11am–2pm94 flights69.1%
2pm–5pm—
5pm–8pm—
8pm–5am—

Scale runs 60% to 100%. 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 69.1% on time against 92.2% 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 170 flights scheduled in it.

Across the year

Alaska on EUG to SEA through the year

Jul–Sep 2025184 flights80.2%
Oct–Dec 202594 flights89.2%
Jan–Mar 202690 flights93.2%
Apr–Jun 202621 flights—

Scale runs 70% 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 86.2% on time across 389 flights.

Alaska on EUG to SEA did not run the same all year. Its best quarter was Jan–Mar 2026 at 93.2% on time and its weakest Jul–Sep 2025 at 80.2%, a swing of 13 points on roughly 130 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, Sunday is the strongest day at 92.6% on time and Thursday the weakest at 76.4%. 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 43% of the 2,807 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
43%
Carrier
40%
National Airspace System
17%

43% 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 2,807 reported delay minutes here, that single category outweighs weather by 43 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 2,807 reported delay minutes.

The largest share of delay minutes, 40%, 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 1,120 of the 2,807 delay minutes reported here.

Cancellations sit at 1.29% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

Badly late arrivals are rare here: only 2.9% 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 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 73.2% on time across 389 flights, 13 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 13 points of difference.

One caution: this is a thin sample. 389 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. 389 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 86.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 384 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