Flight profile · SkyWest Airlines
OO3440
Santa Ana (SNA) to San Francisco (SFO) · scheduled 9:25 AM – 9:43 AM
How OO3440 performs
664 operations, 2023-07-01 to 2026-06-24.
OO3440 arrived on time 62.1% of the time, against 72.3% for all SNA → SFO flights — this specific departure is 10.3 percentage points worse than the route as a whole. Against SkyWest Airlines’s own flights on this route it is 9.7 points worse.
Source: US DOT Bureau of Transportation Statistics · 664 operations between 2023-07-01 to 2026-06-24
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| OO3440 | 62.1% | 0.75% | 3 min | 12.4% | 664 |
| SkyWest Airlines on SNA → SFO | 71.8% | 1.38% | -3 min | 9.7% | 9,843 |
| All SNA → SFO flights | 72.3% | 1.23% | -4 min | 9.5% | 13,393 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-24
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 | 2023-07-01 – 2026-06-17 | 546 | 92.4% |
| SEA→PDX Seattle to Portland | 2025-08-20 – 2025-10-03 | 39 | — |
| SEA→BOI Seattle to Boise | 2025-06-12 – 2025-08-19 | 69 | — |
| PSC→SEA Pasco to Seattle | 2024-11-22 – 2025-06-11 | 56 | — |
| SEA→PSC Seattle to Pasco | 2024-11-22 – 2025-06-11 | 55 | — |
| LAX→SFO Los Angeles to San Francisco | 2025-03-19 – 2025-04-21 | 34 | — |
| PDX→SFO Portland to San Francisco | 2025-02-13 – 2025-03-18 | 34 | — |
| SAN→SBP San Diego to San Luis Obispo | 2025-01-08 – 2025-02-12 | 6 | — |
| SBP→SAN San Luis Obispo to San Diego | 2025-01-08 – 2025-02-12 | 6 | — |
| SFO→SEA San Francisco to Seattle | 2025-01-11 – 2025-02-08 | 5 | — |
| SEA→LAX Seattle to Los Angeles | 2025-02-03 – 2025-02-04 | 2 | — |
| SAN→STS San Diego to Santa Rosa | 2025-01-06 – 2025-01-06 | 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 is a flight whose average understates its risk: a typical day arrives 3 min late, but the worst tenth of days are 61 minutes worse than that. If the day has something unmissable in it, the median is the wrong number to plan against.
Percentiles over 664 operations. Cancelled and diverted flights have no arrival time and are counted separately rather than as very late arrivals.
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, fuelling — 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. 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 SNA → SFO
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| OO5873 | SkyWest Airlines | 68.4% | 4 min early | 632 |
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 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.
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