Carrier route record
WNDEN→EUG
Southwest Airlines · Denver to Eugene
- Flights
- 489
- Period
- September 2025 to August 2026
- Share of route
- 38%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Southwest Airlines.
Southwest on DEN to EUG sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 489 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so Southwest on DEN to EUG runs 6 points behind the country as a whole. Across a thousand flights that is about 63 extra late arrivals.
Key figures
On time
71.0%
Arrivals under 15 minutes late, of 487 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
0.41%
National rate is 1.89%
Whole route
72.3%
Every carrier on DEN to EUG, 1,271 flights
These figures cover 489 flights between September 2025 and August 2026. Beyond the headline rate, 10.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Southwest against every carrier on DEN to EUG
Southwest flew 489 of the 1,271 flights on DEN to EUG, about 38% of it. Its 71.0% on time is about level with the route as a whole at 72.3%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from SkyWest at 96.3% to Southwest at 71.0%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
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 |
|---|---|---|---|---|---|
| SkyWest Airlinesthin sample | 54 | 96.3% | 21 min | 0.00% | A+ |
| United Airlines | 728 | 71.4% | 52 min | 0.14% | C+ |
| Southwest Airlines (this page) | 489 | 71.0% | 60 min | 0.41% | C+ |
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When Southwest runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 39 points, against half a point between the best and worst carrier.
- 5am–8am1 flights—
- 8am–11am194 flights86.6%
- 11am–2pm97 flights83.5%
- 2pm–5pm17 flights—
- 5pm–8pm5 flights—
- 8pm–5am175 flights48.0%
Scale runs 40% to 90%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 48.0% on time, against 86.6% 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 8am–11am window is the busiest, with 194 flights scheduled in it.
Across the year
Southwest on DEN to EUG through the year
- Jul–Sep 202526 flights—
- Oct–Dec 202587 flights81.6%
- Jan–Mar 202680 flights63.8%
- Apr–Jun 2026172 flights66.3%
- Jul–Sep 2026124 flights71.3%
Scale runs 55% to 85%. 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 71.0% on time across 489 flights.
Southwest on DEN to EUG did not run the same all year. Its best quarter was Oct–Dec 2025 at 81.6% on time and its weakest Jan–Mar 2026 at 63.8%, a swing of 18 points on roughly 122 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, Tuesday is the strongest day at 73.9% on time and Thursday the weakest at 68.9%, a spread of 5 points.
Arrival by arrival
How late Southwest on DEN to EUG runs when it is late
The 141 late arrivals split 46 under half an hour, 43 between 30 and 60 minutes, and 52 an hour or more.
- 15+ min early58 flights11.9%
- Within 15 min288 flights59.1%
- 15–29 min late46 flights9.4%
- 30–59 min late43 flights8.8%
- 1–2 hours late34 flights7.0%
- 2+ hours late18 flights3.7%
Scale runs 0% to 100%.
Share of 487 completed flights by arrival against schedule.
32 of 159 late departures made up the time and arrived on time, 20% of them. 14 flights left on time and still arrived late.
The worst days
Worst days for Southwest on DEN to EUG
The latest arrival of the period was on 14 August 2026, 3 hours 28 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 August 2026 | 3 hours 28 minutes | Late-arriving aircraft |
| 19 December 2025 | 3 hours 5 minutes | Late-arriving aircraft |
| 22 May 2026 | 3 hours 5 minutes | Carrier |
| 16 August 2026 | 3 hours 5 minutes | Carrier |
| 6 March 2026 | 2 hours 55 minutes | Late-arriving aircraft |
Delay causes
Why Southwest runs late on this route
Late-arriving aircraft accounts for 61% of the 8,479 delay minutes carriers reported here, and the remaining four split what is left.
- 61%Late-arriving aircraft
- 30%Carrier
- 9%National Airspace System
61% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 8,479 reported delay minutes here, that single category outweighs weather by 61 to one. The split is drawn from 8,479 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 86.6% on time here.
Cancellations are rare at 0.41%, below the national 1.89% 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 costs
10.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
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.
The return leg runs 73.1% on time across 488 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 489 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 Southwest on DEN to EUG
Put together: treat all of this as provisional. 489 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 71.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 487 completed flights over 12 months sit behind that.
Related
Where to go next
- DEN to EUG, every carrier
- Southwest on EUG to DEN, the return leg
- United Airlines on DEN to EUG71.4%
- Southwest Airlines network-wide record
- Denver International (DEN) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.