Route reliability record
EUG→SEA
Eugene to Seattle
- Flights
- 1,954
- Period
- July 2025 to June 2026
- Distance
- 234 mi
- Carriers
- 2
This route 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 10 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 1,954 EUG to SEA flights, of which SkyWest Airlines flew 1,565 at 88.3% on time.
Best time to fly EUG to SEA: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 91.9% of the time and Tuesday flights 89.9%, against 87.8% for the route overall.
Set against the rest of the country, this route's record is 10 points better than the US average of 77.6%. That gap is worth roughly 102 fewer late arrivals for every thousand flights.
Key figures
On time
87.8%
Arrivals under 15 minutes late, of 1,925 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
1.38%
National rate is 1.81%
Best carrier
SkyWest
88.3% on time across 1,565 flights
These figures cover 1,954 flights between July 2025 and June 2026. The median arrival is 10 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
Which airline is most reliable on EUG to SEA
The two carriers here are closely matched: 2 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 1,565 | 88.3% | 65 min | 1.41% | A |
| Alaska Airlines | 389 | 86.2% | 53 min | 1.29% | A |
No carrier stands out. SkyWest tops the table at 88.3%, 2 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Flight by flight
Flights on EUG to SEA
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
Best ways to make this trip
The most reliable ways to fly Eugene to Seattle
Every airline on this route, ranked by how often a scheduled flight actually operated and arrived on time, with its best departure time and most punctual flight number. No nearby airport pair beat these.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. EUG → SEAEugene to Seattle | SkyWest Airlines | 87.1% | 88.3% | 1.41% | 5am–8am, Tue | OO 4128 06:30 |
| 2. EUG → SEAEugene to Seattle | Alaska Airlines | 85.1% | 86.2% | 1.29% | 8am–11am, Sun | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
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 1,954 flights.
- 5am–8am577 flights91.9%
- 8am–11am284 flights88.5%
- 11am–2pm566 flights84.0%
- 2pm–5pm108 flights91.6%
- 5pm–8pm391 flights87.8%
- 8pm–5am28 flights—
Scale runs 75% 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 84.0% on time against 91.9% for 5am–8am. 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 5am–8am window is the busiest, with 577 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 13 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
April is the best month on the calendar at 95.5% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. September was the busiest month here, with 210 flights.
Across the week, Tuesday is the strongest day at 89.9% on time and Friday the weakest at 85.3%. 5 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
One category carries most of the weight here. Carrier accounts for 58% of the 15,000 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.
- 58%Carrier
- 24%Late-arriving aircraft
- 9%Extreme weather
- 8%National Airspace System
- 0%Security
The largest share of delay minutes, 58%, 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 8,475 of the 15,000 delay minutes reported here. The split is drawn from 14,587 reported delay minutes.
Cancellations sit at 1.38% against a national 1.81%, which is ordinary. Diversions add another 0.10%.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 3.3% 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 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 84.4% on time across 1,951 flights, 3 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 3 points of difference.
The sample behind these figures is 1,954 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in SEA after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 95.5% on time and May 82.4%, a swing of 13 points. If the dates move at all, move them out of May before you think about anything else. 1,925 completed flights over 12 months sit behind that.
Common questions
EUG to SEA questions
How often is EUG to SEA delayed?
About one flight in eight arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 12.2% of the 1,954 flights in this analysis, against 22.4% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on EUG to SEA?
SkyWest Airlines leads at 88.3% on time across 1,565 flights. Alaska Airlines is at the other end on 86.2%, a gap of 2 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on EUG to SEA?
The 5am–8am departure window is the strongest at 91.9% on time. The 11am–2pm window is the weakest at 84.0%, 8 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are May delays on EUG to SEA?
May is the weakest month at 82.4% on time, compared with 95.5% in April. Across the year that is 13 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- SEA to EUG — the return legseparate record
- Seattle-Tacoma International (SEA) delay statistics
- SkyWest Airlines on EUG to SEA88.3%
- Alaska Airlines on EUG to SEA86.2%
- EUG to DEN, a related route79.2%
- LAX to SEA, a related route85.4%
- EUG to SFO, a related route72.0%
- SkyWest Airlines on-time record88.3%
- Alaska Airlines on-time record86.2%
- Worst months to fly in the US, ranked by the data
- The best time of day to fly, according to 7.04 million flight records
Direction matters. EUG to SEA and SEA to EUG are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.