Route reliability record
SEA→EUG
Seattle to Eugene
- Flights
- 1,951
- Period
- July 2025 to June 2026
- Distance
- 234 mi
- Carriers
- 2
This route earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 55 minutes. That rests on 1,951 SEA to EUG flights, of which SkyWest Airlines flew 1,562 at 87.1% on time.
Best time to fly SEA to EUG: a 8am–11am departure, ideally on a Tuesday. Flights in that window arrived on time 90.3% of the time and Tuesday flights 87.3%, against 84.4% for the route overall.
Set against the rest of the country, this route's record is 7 points better than the US average of 77.6%. That gap is worth roughly 68 fewer late arrivals for every thousand flights.
Key figures
On time
84.4%
Arrivals under 15 minutes late, of 1,925 completed flights
Avg delay
55 min
Across delayed arrivals only, not all flights
Cancelled
1.28%
National rate is 1.81%
Best carrier
SkyWest
87.1% on time across 1,562 flights
These figures cover 1,951 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
Which airline is most reliable on SEA to EUG
The choice of carrier is not cosmetic here. SkyWest Airlines arrives on time 87.1% of the time; Alaska Airlines manages 73.2%. Sample sizes sit next to every figure, because a two-point gap across 389 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 1,562 | 87.1% | 61 min | 1.34% | A |
| Alaska Airlines | 389 | 73.2% | 43 min | 1.03% | C |
The spread between SkyWest and Alaska is 14 points, wide enough that it should decide the booking. On a hundred trips that is 14 more arrivals inside the on-time window.
Flight by flight
Flights on SEA to EUG
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 Seattle to Eugene
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. SEA → EUGSeattle to Eugene | SkyWest Airlines | 85.9% | 87.1% | 1.34% | 8am–11am, Tue | OO 4124 15:25 |
| 2. SEA → EUGSeattle to Eugene | Alaska Airlines | 72.4% | 73.2% | 1.03% | 5pm–8pm, Thu | AS 161 23:10 |
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 matters more here than the choice of carrier. The gap between the best and worst window is 16 points, against 14 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am—
- 8am–11am314 flights90.3%
- 11am–2pm279 flights74.6%
- 2pm–5pm400 flights89.6%
- 5pm–8pm171 flights77.8%
- 8pm–5am787 flights84.3%
Scale runs 65% 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 74.6% on time against 90.3% 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 8pm–5am window is the busiest, with 787 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 14 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.
July is the worst month at 76.0% on time, 14 points below April, the best at 90.1%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. September was the busiest month here, with 210 flights.
Across the week, Tuesday is the strongest day at 87.3% on time and Friday the weakest at 82.5%. 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 50% of the 16,000 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.
- 50%Carrier
- 27%Late-arriving aircraft
- 13%Extreme weather
- 9%National Airspace System
- 1%Security
Extreme weather accounts for 13% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.0 times the usual weather exposure. The split is drawn from 16,451 reported delay minutes.
The largest share of delay minutes, 50%, 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 8,293 of the 16,000 delay minutes reported here.
Cancellations sit at 1.28% against a national 1.81%, which is ordinary. Diversions add another 0.05%.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 3.9% 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 87.8% on time across 1,954 flights, 3 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 3 points of difference.
The sample behind these figures is 1,951 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 EUG 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 90.1% on time and July 76.0%, a swing of 14 points. If the dates move at all, move them out of July before you think about anything else. 1,925 completed flights over 12 months sit behind that.
Common questions
SEA to EUG questions
How often is SEA to EUG delayed?
About one flight in six arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 15.6% of the 1,951 flights in this analysis, against 22.4% nationally. Delayed flights are late by about 55 minutes on average.
Which airline is most reliable on SEA to EUG?
SkyWest Airlines leads at 87.1% on time across 1,562 flights. Alaska Airlines is at the other end on 73.2%, a gap of 14 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 SEA to EUG?
The 8am–11am departure window is the strongest at 90.3% on time. The 11am–2pm window is the weakest at 74.6%, 16 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 July delays on SEA to EUG?
July is the weakest month at 76.0% on time, compared with 90.1% in April. Across the year that is 14 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
- EUG to SEA — the return legseparate record
- Seattle-Tacoma International (SEA) delay statistics
- SkyWest Airlines on SEA to EUG87.1%
- Alaska Airlines on SEA to EUG73.2%
- SEA to LAX, a related route83.4%
- DEN to EUG, a related route73.5%
- SEA to PHX, a related route79.2%
- SkyWest Airlines on-time record87.1%
- Alaska Airlines on-time record73.2%
- Same route, different airline: where the carrier you pick matters most
- The best time of day to fly, according to 7.04 million flight records
Direction matters. SEA to EUG and EUG to SEA 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.