Flight profile · SkyWest Airlines
OO3439
San Diego (SAN) to Sacramento (SMF) · scheduled 1:23 PM – 3:05 PM
How OO3439 performs
625 operations, 2023-11-19 to 2026-06-30.
OO3439 arrived on time 70.9% of the time, against 77.4% for all SAN → SMF flights — this specific departure is 6.5 percentage points worse than the route as a whole. Against SkyWest Airlines’s own flights on this route it is 5.8 points worse.
Source: US DOT Bureau of Transportation Statistics · 625 operations between 2023-11-19 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| OO3439 | 70.9% | 0.32% | -1 min | 9.2% | 625 |
| SkyWest Airlines on SAN → SMF | 76.7% | 0.93% | -3 min | 6.2% | 3,559 |
| All SAN → SMF flights | 77.4% | 0.79% | -3 min | 5.7% | 15,886 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-11-19 to 2026-06-30
Other routes OO3439 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 |
|---|---|---|---|
| SMF→SAN Sacramento to San Diego | 2023-11-19 – 2026-06-30 | 594 | 76.4% |
| PDX→SEA Portland to Seattle | 2025-08-20 – 2025-10-03 | 39 | — |
| SJC→LAX San Jose to Los Angeles | 2025-04-24 – 2025-05-12 | 15 | — |
| LAX→LAS Los Angeles to Las Vegas | 2025-03-19 – 2025-04-19 | 14 | — |
| PDX→SFO Portland to San Francisco | 2023-11-17 – 2025-03-15 | 6 | — |
| SFO→PDX San Francisco to Portland | 2025-02-15 – 2025-03-15 | 5 | — |
| SFO→SNA San Francisco to Santa Ana | 2024-12-22 – 2025-01-05 | 3 | — |
| SAN→SJC San Diego to San Jose | 2024-12-21 – 2025-01-04 | 3 | — |
| SFO→LAX San Francisco to Los Angeles | 2023-07-01 – 2024-04-13 | 131 | 94.6% |
| LAX→SFO Los Angeles to San Francisco | 2023-09-06 – 2023-11-16 | 69 | — |
Because the same number has served different journeys, the statistics above describe only the route OO3439 currently operates. Blending them would produce an average of two different flights.
Why OO3439 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding, fuelling — within the carrier’s control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for OO3439 on SAN → SMF. 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 SAN → SMF
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| OO3368 | SkyWest Airlines | 83.6% | 6 min early | 790 |
| OO3410 | SkyWest Airlines | 75.1% | 2 min early | 628 |
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 625 records of OO3439 operating SAN → SMF, 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.
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