Flight profile · SkyWest Airlines
OO3398
Sacramento (SMF) to San Diego (SAN) · scheduled 6:00 AM – 7:36 AM
How OO3398 performs
746 operations, November 2023 – June 2026.
OO3398 arrived on time 89.5% of the time, against 76.3% for all SMF → SAN flights, so this departure is 13.2 percentage points better than the route as a whole. Against SkyWest Airlines’ own flights on this route it is 10.7 points better.
Source: US DOT Bureau of Transportation Statistics · 746 operations, November 2023 – June 2026 · If OO3398 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
What stands out
How OO3398 compares to other flight numbers, not just to itself.
This flight runs unusually far ahead of the SMF → SAN route as a whole, better than 96% of 11,788 comparable flight numbers.
89.5% on time for this specific departure, against 76.3% for every SMF → SAN flight.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – June 2026 · The one thing about this specific departure that ranks most extreme against every other published flight number, out of everything FlyerIntel checks — shown only when something clears a real statistical bar, not for every flight.
Where OO3398 is right now
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| OO3398 | 89.5% | 1.07% | -8 min | 2.3% | 746 |
| SkyWest Airlines on SMF → SAN | 78.8% | 1.09% | -3 min | 5.4% | 3,653 |
| All SMF → SAN flights | 76.3% | 0.85% | -1 min | 5.5% | 16,310 |
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – June 2026
Why OO3398 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for OO3398 on SMF → SAN. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – June 2026
Does a late aircraft delay this flight?
How often the plane that flies OO3398 comes in late, and what that does to the departure.
OO3398 is usually the aircraft’s first flight of the day: the schedule gives it a median of 7.3 hours on the ground at SMF, so its “inbound” is mostly the aircraft’s arrival the evening before.
When the aircraft came in 15 or more minutes late, OO3398 pushed back an average of 2 minutes early; when it came in on time or early, an average of 4 minutes early.
Each departure is matched to the flight the same aircraft flew into SMF just before it, using the tail number in the DOT file, 719 of 738 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 |
|---|---|---|---|
| OO3398 | 28% | 7% | 3% |
| Network, same turn | 29% | 12% | 9% |
A night on the ground absorbs most of a late arrival, so a late inbound matters far less on a turn this long than on a same-day one.
The network row is every flight with a scheduled turn of 6 hours or more, usually overnight. How often OO3398’s aircraft landed 15 or more minutes late is about the same as the network’s and, once the aircraft was late, how often OO3398 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 – June 2026
From pushback to gate
When it leaves SMF late, does that still matter by the time it reaches SAN?
On arrival at SAN, OO3398 spends 8.9 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 2.9 minutes longer than a typical SAN arrival (6.0 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 SAN. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 16,970 departures from SMF scheduled in the clock hour OO3398 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at SAN (297,664 flights), not just OO3398’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – June 2026
The hour it leaves SMF
Part of any flight’s record belongs to the clock rather than to the flight. OO3398 has one departure time, so this is what that time is worth.
On-time arrival rate. 16,970 departures from SMF are scheduled in the 6 AM–7 AM hour over the period, against 172,472 across the whole day.
OO3398 is scheduled out of SMF at 6:00 AM, in the 6 AM–7 AM bank. Departures from SMF in that hour arrive on time 93.5% of the time against 83.2% across the airport’s whole day — the slot alone is worth 10.3 points better before anything about this particular flight is considered.
The two airport figures cover every departure from SMF 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 – June 2026 · Hours below 120 departures are not scored.
Other routes OO3398 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 |
|---|---|---|---|
| LAS→LAX Las Vegas to Los Angeles | August 19, 2023 – January 6, 2026 | 4 | — |
| SAN→SMF San Diego to Sacramento | November 19, 2023 – March 11, 2024 | 33 | — |
| SAN→SJC San Diego to San Jose | November 17–25, 2023 | 3 | — |
| LAX→SFO Los Angeles to San Francisco | September 6, 2023 – November 16, 2023 | 72 | — |
| SFO→LAX San Francisco to Los Angeles | September 6, 2023 – November 13, 2023 | 57 | — |
| LAX→LAS Los Angeles to Las Vegas | August 19, 2023 – September 2, 2023 | 3 | — |
| PDX→SFO Portland to San Francisco | August 15–30, 2023 | 4 | — |
| LAX→PDX Los Angeles to Portland | July 15, 2023 – August 12, 2023 | 5 | — |
| GEG→SEA Spokane to Seattle | July 1, 2023 | 1 | — |
Because the same number has served different journeys, the statistics above describe only the route OO3398 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.
15 min late
against a median of 8 min early
Percentiles over 746 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – June 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| OO3398 this flight | SkyWest Airlines | 89.5% | 8 min early | 746 |
| OO3368 | SkyWest Airlines | 80.5% | 3 min early | 759 |
| OO3439 | SkyWest Airlines | 76.8% | 2 min early | 625 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. OO3398 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 746 records of OO3398 operating SMF → SAN, 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
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