Flight profile · SkyWest Airlines
OO3439
San Diego (SAN) to Sacramento (SMF) · scheduled 1:23 PM – 3:05 PM
How OO3439 performs
656 operations, November 2023 – July 2026.
OO3439 arrived on time 71.5% of the time, against 77.1% for all SAN → SMF flights, so this departure is 5.6 percentage points worse than the route as a whole. Against SkyWest Airlines’ own flights on this route it is 5.2 points worse.
Source: US DOT Bureau of Transportation Statistics · 656 operations, November 2023 – July 2026 · If OO3439 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where OO3439 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
Ask for the position of OO3439 right now, if receivers on the ground are hearing it. Nothing is requested until you press the button.
Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| OO3439 | 71.5% | 0.46% | -1 min | 8.7% | 656 |
| SkyWest Airlines on SAN → SMF | 76.7% | 0.93% | -3 min | 6.2% | 3,651 |
| All SAN → SMF flights | 77.1% | 0.79% | -3 min | 5.7% | 16,348 |
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – July 2026
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 and fueling, all 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. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies OO3439 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, OO3439 pushed back an average of 37 minutes late; when it came in on time or early, an average of 2 minutes early.
Each departure is matched to the flight the same aircraft flew into SAN just before it, using the tail number in the DOT file, 628 of 653 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| OO3439 | 30% | 75% | 5% |
| Network, same turn | 18% | 92% | 12% |
The schedule leaves little slack between the inbound landing and this departure, so a late arrival has almost nowhere to go but into the departure.
The network row is every flight with a scheduled turn of 30 to 44 minutes. How often OO3439’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often OO3439 left 15 or more minutes late is lower than the network’s.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – July 2026
From pushback to gate
When it leaves SAN late, does that still matter by the time it reaches SMF?
OO3439 pushes back an average of 13.3 minutes late and reaches the gate at SMF an average of 11.2 minutes late. The 2.1 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 24.6 minutes on the taxiways at SAN, 3.9 minutes longer than a typical SAN departure in the same hour.
On arrival at SMF, OO3439 spends 6.3 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is 1.1 minutes longer than a typical SMF arrival (5.1 min).
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached SMF. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 20,379 departures from SAN scheduled in the clock hour OO3439 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at SMF (172,477 flights), not just OO3439’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – July 2026
The hour it leaves SAN
Part of any flight’s record belongs to the clock rather than to the flight. OO3439 has one departure time, so this is what that time is worth.
On-time arrival rate. 20,379 departures from SAN are scheduled in the 1 PM–2 PM hour over the period, against 297,668 across the whole day.
OO3439 is scheduled out of SAN at 1:23 PM, in the 1 PM–2 PM bank. Departures from SAN in that hour arrive on time 73.3% of the time against 77.9% across the airport’s whole day — the slot alone is worth 4.7 points worse before anything about this particular flight is considered.
The two airport figures cover every departure from SAN to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – July 2026 · Hours below 120 departures are not scored.
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 | November 19, 2023 – July 31, 2026 | 625 | 76.8% |
| PDX→SEA Portland to Seattle | August 20, 2025 – October 3, 2025 | 39 | — |
| SJC→LAX San Jose to Los Angeles | April 24, 2025 – May 12, 2025 | 15 | — |
| LAX→LAS Los Angeles to Las Vegas | March 19, 2025 – April 19, 2025 | 14 | — |
| PDX→SFO Portland to San Francisco | November 17, 2023 – March 15, 2025 | 6 | — |
| SFO→PDX San Francisco to Portland | February 15, 2025 – March 15, 2025 | 5 | — |
| SFO→SNA San Francisco to Santa Ana | December 22, 2024 – January 5, 2025 | 3 | — |
| SAN→SJC San Diego to San Jose | December 21, 2024 – January 4, 2025 | 3 | — |
| SFO→LAX San Francisco to Los Angeles | July 1, 2023 – April 13, 2024 | 131 | 94.6% |
| LAX→SFO Los Angeles to San Francisco | September 6, 2023 – November 16, 2023 | 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.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
48 min late
against a median of 1 min early
Percentiles over 656 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – July 2026
Other flights on this route
Same airports, same journey, different 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 |
| OO3439 this flight | SkyWest Airlines | 71.5% | 1 min early | 656 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. OO3439 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 656 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.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed