Route reliability record
EUG→SEA
Eugene to Seattle
- Flights
- 1,897
- Period
- September 2025 to August 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 77.3%. When something does go wrong the average delay runs about an hour. That rests on 1,897 EUG to SEA flights, with a median arrival 10 minutes early.
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 89.4%, against 87.5% for the route overall.
Set against the rest of the country, this route's record is 10 points better than the US average of 77.3%. That gap is worth roughly 102 fewer late arrivals for every thousand flights.
Key figures
On time
87.5%
Arrivals under 15 minutes late, of 1,869 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
1.37%
National rate is 1.89%
Best carrier
SkyWest
86.9% on time across 1,632 flights
These figures cover 1,897 flights between September 2025 and August 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.
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Carrier by carrier
Which airline is most reliable on EUG to SEA
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 Airlinesthin sample | 265 | 91.2% | 50 min | 1.13% | A |
| SkyWest Airlines | 1,632 | 86.9% | 68 min | 1.41% | A |
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.
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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 1,897 flights.
- 5am–8am515 flights91.9%
- 8am–11am222 flights89.9%
- 11am–2pm542 flights85.0%
- 2pm–5pm121 flights90.8%
- 5pm–8pm469 flights85.1%
- 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 85.0% 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 11am–2pm window is the busiest, with 542 flights scheduled in it.
Explore
Filter EUG to SEA by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On EUG to SEA, the best departure window is 5am–8am at 91.9% on time and the worst is 11am–2pm at 85.0%, a real gap of 6.9 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am91.9%
- 8–11am89.9%
- 11am–2pm85.0%
- 2–5pm90.8%
- 5–8pm85.1%
- 8pm–5am—
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 19 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.
August is the worst month at 76.2% on time, 19 points below April, the best at 95.5%. 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.
The day of the week is close to irrelevant here: 4 points separates the best day from the worst. Weekly demand peaks are not what drives the delays on this operation.
Delay causes
Why this route gets delayed
Carrier accounts for 54% of the 15,000 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Carrier
- 27%Late-arriving aircraft
- 10%National Airspace System
- 8%Extreme weather
- 0%Security
The largest share of delay minutes, 54%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 8,399 of the 15,000 delay minutes reported here. The split is drawn from 15,456 reported delay minutes.
Cancellations sit at 1.37% against a national 1.89%, which is ordinary. Diversions add another 0.11%.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 3.7% 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 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 84.2% on time across 1,894 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 1,897 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 August 76.2%, a swing of 19 points. If the dates move at all, move them out of August before you think about anything else. 1,869 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 12.5% of the 1,897 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is EUG to SEA compared with the rest of the country?
87.5% of flights arrive on time here against a national 77.3%, a difference of 10 points in its favour. That is worth a A on this site's grading scale.
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 85.0%, 7 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 August delays on EUG to SEA?
August is the weakest month at 76.2% on time, compared with 95.5% in April. Across the year that is 19 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
- Alaska Airlines on EUG to SEA91.2%
- SkyWest Airlines on EUG to SEA86.9%
- EUG to DEN, a related route79.9%
- LAX to SEA, a related route85.0%
- EUG to SFO, a related route65.6%
- Alaska Airlines on-time record91.2%
- SkyWest Airlines on-time record86.9%
- Worst months to fly in the US, ranked by the data
- Does flight distance affect delays? Less than it affects cancellations
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.