Flight profile · SkyWest Airlines
OO4031
Seattle (SEA) to Ontario (ONT) · scheduled 2:30 PM – 5:10 PM
How OO4031 performs
688 operations, 2024-04-08 to 2026-06-30.
OO4031 arrived on time 89.5% of the time, against 82.3% for all SEA → ONT flights — this specific departure is 7.2 percentage points better than the route as a whole.
Source: US DOT Bureau of Transportation Statistics · 688 operations between 2024-04-08 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| OO4031 | 89.5% | 0.15% | -8 min | 1.7% | 688 |
| SkyWest Airlines on SEA → ONT | 89.6% | 0.14% | -8 min | 2.3% | 2,805 |
| All SEA → ONT flights | 82.3% | 1.01% | -5 min | 4.1% | 7,500 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-04-08 to 2026-06-30
Other routes OO4031 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.
| Route | Operated | Flights | On time |
|---|---|---|---|
| ONT→SEA Ontario to Seattle | 2024-07-08 – 2026-06-30 | 626 | 91.2% |
| PVD→DTW Providence/Warwick to Detroit | 2024-12-22 – 2024-12-22 | 1 | — |
| DTW→BHM Detroit to Birmingham | 2024-09-09 – 2024-10-06 | 24 | — |
| BHM→DTW Birmingham to Detroit | 2024-09-09 – 2024-10-06 | 24 | — |
| DTW→STL Detroit to St. Louis | 2024-09-14 – 2024-10-05 | 4 | — |
| STL→DTW St. Louis to Detroit | 2024-09-14 – 2024-10-05 | 4 | — |
| SLC→MFR Salt Lake City to Medford | 2023-09-05 – 2024-06-06 | 158 | 85.1% |
| PHX→SLC Phoenix to Salt Lake City | 2024-03-16 – 2024-04-06 | 4 | — |
| SLC→PHX Salt Lake City to Phoenix | 2024-03-16 – 2024-04-06 | 4 | — |
| SEA→PSC Seattle to Pasco | 2023-11-05 – 2023-12-15 | 35 | — |
| PSC→SEA Pasco to Seattle | 2023-11-05 – 2023-12-15 | 33 | — |
| GRB→MSP Green Bay to Minneapolis | 2023-11-18 – 2023-11-18 | 1 | — |
| MSP→GRB Minneapolis to Green Bay | 2023-11-18 – 2023-11-18 | 1 | — |
| DTW→IAD Detroit to Washington | 2023-10-28 – 2023-11-04 | 5 | — |
| JFK→ORD New York to Chicago | 2023-07-01 – 2023-09-04 | 66 | — |
Because the same number has served different journeys, the statistics above describe only the route OO4031 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 688 records of OO4031 operating SEA → ONT, 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.