Route reliability record
DEN→EUG
Denver to Eugene
- Flights
- 1,272
- Period
- July 2025 to June 2026
- Distance
- 996 mi
- Carriers
- 3
This route sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 1,272 DEN to EUG flights, of which United Airlines flew 728 at 72.1% on time.
Best time to fly DEN to EUG: a 8am–11am departure, ideally on a Tuesday. Flights in that window arrived on time 82.3% of the time and Tuesday flights 79.5%, against 73.5% for the route overall.
The national on-time rate over the same period is 77.6%, so this route runs 4 points behind the country as a whole. Across a thousand flights that is about 41 extra late arrivals.
Key figures
On time
73.5%
Arrivals under 15 minutes late, of 1,270 completed flights
Avg delay
55 min
Across delayed arrivals only, not all flights
Cancelled
0.16%
National rate is 1.81%
Best carrier
United
72.1% on time across 728 flights
These figures cover 1,272 flights between July 2025 and June 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
Carrier by carrier
Which airline is most reliable on DEN to EUG
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 Airlinesthin sample | 116 | 95.7% | 60 min | 0.00% | A+ |
| United Airlines | 728 | 72.1% | 56 min | 0.14% | C+ |
| Southwest Airlines | 428 | 69.8% | 55 min | 0.23% | C+ |
No carrier stands out. United tops the table at 72.1%, 2 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Flight by flight
Flights on DEN 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 Denver 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. DEN → EUGDenver to Eugene | United Airlines | 72.0% | 72.1% | 0.14% | 11am–2pm, Tue | UA 318 11:15 |
| 2. DEN → EUGDenver to Eugene | Southwest Airlines | 69.6% | 69.8% | 0.23% | 11am–2pm, Mon | — |
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 37 points, against 2 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am1 flights—
- 8am–11am147 flights82.3%
- 11am–2pm593 flights79.2%
- 2pm–5pm34 flights66.7%
- 5pm–8pm364 flights71.4%
- 8pm–5am133 flights45.1%
Scale runs 35% to 90%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 45.1% on time, against 82.3% for the 8am–11am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 11am–2pm window is the busiest, with 593 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 41 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.
June is the worst month at 50.0% on time, 41 points below November, the best at 90.7%. 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. July was the busiest month here, with 128 flights.
Across the week, Tuesday is the strongest day at 79.5% on time and Saturday the weakest at 69.1%. 10 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. Late-arriving aircraft accounts for 55% of the 19,000 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.
- 55%Late-arriving aircraft
- 30%Carrier
- 15%National Airspace System
55% 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 19,000 reported delay minutes here, that single category outweighs weather by 55 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 18,642 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 82.3% on time here.
Cancellations are rare at 0.16%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here actually costs
7.3% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 996 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg is a different operation and performs like one: it runs 79.2% on time across 1,271 flights, 6 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 6 points of difference.
The sample behind these figures is 1,272 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. November runs 90.7% on time and June 50.0%, a swing of 41 points. If the dates move at all, move them out of June before you think about anything else. 1,270 completed flights over 12 months sit behind that.
Common questions
DEN to EUG questions
How often is DEN to EUG delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 26.5% of the 1,272 flights in this analysis, against 22.4% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on DEN to EUG?
United Airlines leads at 72.1% on time across 728 flights. Southwest Airlines is at the other end on 69.8%, 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 DEN to EUG?
The 8am–11am departure window is the strongest at 82.3% on time. The 8pm–5am window is the weakest at 45.1%, 37 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 June delays on DEN to EUG?
June is the weakest month at 50.0% on time, compared with 90.7% in November. Across the year that is 41 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 DEN — the return legseparate record
- Denver International (DEN) delay statistics
- SkyWest Airlines on DEN to EUG95.7%
- United Airlines on DEN to EUG72.1%
- Southwest Airlines on DEN to EUG69.8%
- DEN to PHX, a related route75.7%
- SEA to EUG, a related route84.4%
- DEN to SLC, a related route77.5%
- SkyWest Airlines on-time record95.7%
- United Airlines on-time record72.1%
- Southwest Airlines on-time record69.8%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
Direction matters. DEN to EUG and EUG to DEN 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.