Flight profile · SkyWest Airlines
OO4135
Salt Lake City (SLC) to Eugene (EUG) · scheduled 10:45 AM – 12:10 PM
How OO4135 performs
981 operations, 2023-09-05 to 2026-06-30.
Source: US DOT Bureau of Transportation Statistics · 981 operations between 2023-09-05 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| OO4135 | 92.0% | 0.41% | -6 min | 2.4% | 981 |
| SkyWest Airlines on SLC → EUG | 91.6% | 0.45% | -7 min | 2.0% | 2,205 |
| All SLC → EUG flights | 91.6% | 0.45% | -7 min | 2.0% | 2,205 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-09-05 to 2026-06-30
By day of week
Does OO4135 run worse on particular days?
Friday is historically the most reliable day and Monday the least, a gap of 9.4 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-09-05 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes OO4135 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
Because the same number has served different journeys, the statistics above describe only the route OO4135 currently operates. Blending them would produce an average of two different flights.
Why OO4135 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding, fuelling — within the carrier’s control
weather severe enough to stop this flight specifically
airspace and airport capacity, including weather-driven flow control
Share of the delay minutes US DOT attributed to each cause for OO4135 on SLC → EUG. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on SLC → EUG
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| OO3721 | SkyWest Airlines | 91.9% | 8 min early | 726 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 981 records of OO4135 operating SLC → EUG, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.