Flight profile · SkyWest Airlines
OO5440
San Francisco (SFO) to Santa Ana (SNA) · scheduled 1:30 PM – 3:11 PM
How OO5440 performs
888 operations, 2023-10-29 to 2026-06-30.
OO5440 arrived on time 79.1% of the time, against 80.7% for all SFO → SNA flights — this specific departure is 1.6 percentage points worse than the route as a whole. Against SkyWest Airlines’s own flights on this route it is 1.1 points worse.
Source: US DOT Bureau of Transportation Statistics · 888 operations between 2023-10-29 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| OO5440 | 79.1% | 0.90% | -7 min | 7.4% | 888 |
| SkyWest Airlines on SFO → SNA | 80.1% | 1.30% | -5 min | 5.8% | 9,781 |
| All SFO → SNA flights | 80.7% | 1.12% | -6 min | 5.7% | 13,328 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-10-29 to 2026-06-30
By day of week
Does OO5440 run worse on particular days?
Tuesday is historically the most reliable day and Sunday the least, a gap of 10.1 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-10-29 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes OO5440 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 |
|---|---|---|---|
| SHV→IAH Shreveport to Houston | 2025-05-01 – 2025-05-21 | 21 | — |
| LEX→ORD Lexington to Chicago | 2025-04-01 – 2025-04-30 | 16 | — |
| EGE→DEN Eagle to Denver | 2023-12-14 – 2023-12-20 | 7 | — |
| SMF→SFO Sacramento to San Francisco | 2023-09-29 – 2023-10-28 | 28 | — |
| SAN→SFO San Diego to San Francisco | 2023-10-14 – 2023-10-15 | 2 | — |
| GRB→ORD Green Bay to Chicago | 2023-09-01 – 2023-09-01 | 1 | — |
| LAX→LAS Los Angeles to Las Vegas | 2023-07-02 – 2023-08-31 | 49 | — |
| ORD→MSN Chicago to Madison | 2023-07-01 – 2023-07-29 | 5 | — |
Because the same number has served different journeys, the statistics above describe only the route OO5440 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.
46 min late
against a median of 7 min early
Percentiles over 888 operations. Cancelled and diverted flights have no arrival time and are counted separately rather than as very late arrivals.
Why OO5440 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding, fuelling — 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 OO5440 on SFO → SNA. 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 SFO → SNA
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| OO3494 | SkyWest Airlines | 75.9% | 3 min early | 636 |
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 888 records of OO5440 operating SFO → SNA, 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 · Report a problem
Analysis last recomputed