Flight profile · SkyWest Airlines
OO3440
Santa Ana (SNA) to San Francisco (SFO) · scheduled 9:25 AM – 9:43 AM
How OO3440 performs
664 operations, July 2023 – June 2026.
OO3440 arrived on time 62.1% of the time, against 71.6% for all SNA → SFO flights, so this departure is 9.5 percentage points worse than the route as a whole. Against SkyWest Airlines’ own flights on this route it is 9.0 points worse.
Source: US DOT Bureau of Transportation Statistics · 664 operations, July 2023 – June 2026 · If OO3440 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where OO3440 is right now
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| OO3440 | 62.1% | 0.75% | 3 min | 12.4% | 664 |
| SkyWest Airlines on SNA → SFO | 71.1% | 1.40% | -3 min | 9.9% | 10,112 |
| All SNA → SFO flights | 71.6% | 1.26% | -3 min | 9.7% | 13,797 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026
Why OO3440 runs late
Where US DOT attributed the delay minutes on this flight.
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for OO3440 on SNA → SFO. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – June 2026
Does a late aircraft delay this flight?
How often the plane that flies OO3440 comes in late, and what that does to the departure.
The aircraft flying OO3440 came in 15 or more minutes late on 10% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Each departure is matched to the flight the same aircraft flew into SNA just before it, using the tail number in the DOT file, 629 of 659 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 |
|---|---|
| OO3440 | 10% |
| Network, same turn | 18% |
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 OO3440’s aircraft landed 15 or more minutes late is lower than the network’s. There are not enough departures in both groups to compare how it left.
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 July 2023 – June 2026
From pushback to gate
When it leaves SNA late, does that still matter by the time it reaches SFO?
OO3440 pushes back an average of 12.5 minutes late and arrives a further 3.3 minutes behind that. This departure loses ground between the two gates rather than recovering it, so a late pushback here tends to get worse on the way, not better. It spends 22.7 minutes on the taxiways at SNA, 8.6 minutes longer than a typical SNA departure in the same hour.
On arrival at SFO, OO3440 spends 7.0 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 about what any arrival at SFO spends on the ground before reaching the gate.
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 SFO. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 8,610 departures from SNA scheduled in the clock hour OO3440 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at SFO (436,060 flights), not just OO3440’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026
The hour it leaves SNA
Part of any flight’s record belongs to the clock rather than to the flight. OO3440 has one departure time, so this is what that time is worth.
On-time arrival rate. 8,610 departures from SNA are scheduled in the 9 AM–10 AM hour over the period, against 137,357 across the whole day.
OO3440 is scheduled out of SNA at 9:25 AM, in the 9 AM–10 AM bank. Departures from SNA in that hour arrive on time 86.8% of the time against 82.2% across the airport’s whole day — the slot alone is worth 4.6 points better before anything about this particular flight is considered.
The two airport figures cover every departure from SNA 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 · July 2023 – June 2026 · Hours below 120 departures are not scored.
Other routes OO3440 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 |
|---|---|---|---|
| SFO→SNA San Francisco to Santa Ana | July 1, 2023 – June 17, 2026 | 546 | 92.4% |
| SEA→PDX Seattle to Portland | August 20, 2025 – October 3, 2025 | 39 | — |
| SEA→BOI Seattle to Boise | June 12, 2025 – August 19, 2025 | 69 | — |
| PSC→SEA Pasco to Seattle | November 22, 2024 – June 11, 2025 | 56 | — |
| SEA→PSC Seattle to Pasco | November 22, 2024 – June 11, 2025 | 55 | — |
| LAX→SFO Los Angeles to San Francisco | March 19, 2025 – April 21, 2025 | 34 | — |
| PDX→SFO Portland to San Francisco | February 13, 2025 – March 18, 2025 | 34 | — |
| SAN→SBP San Diego to San Luis Obispo | January 8, 2025 – February 12, 2025 | 6 | — |
| SBP→SAN San Luis Obispo to San Diego | January 8, 2025 – February 12, 2025 | 6 | — |
| SFO→SEA San Francisco to Seattle | January 11, 2025 – February 8, 2025 | 5 | — |
| SEA→LAX Seattle to Los Angeles | February 3–4, 2025 | 2 | — |
| SAN→STS San Diego to Santa Rosa | January 6, 2025 | 1 | — |
Because the same number has served different journeys, the statistics above describe only the route OO3440 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.
64 min late
against a median of 3 min late
OO3440 has an average that understates its risk: a typical arrival is 3 min late, but the worst tenth are 61 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 664 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 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 |
|---|---|---|---|---|
| OO5873 | SkyWest Airlines | 68.4% | 4 min early | 632 |
| OO3440 this flight | SkyWest Airlines | 62.1% | 3 min late | 664 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. OO3440 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 664 records of OO3440 operating SNA → SFO, 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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