Flight profile · SkyWest Airlines
OO5440
San Francisco (SFO) to Santa Ana (SNA) · scheduled 1:30 PM – 3:11 PM
How OO5440 performs
919 operations, October 2023 – July 2026.
OO5440 arrived on time 79.2% of the time, against 80.2% for all SFO → SNA flights, so this departure is 1.0 percentage points worse than the route as a whole.
Source: US DOT Bureau of Transportation Statistics · 919 operations, October 2023 – July 2026 · If OO5440 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where OO5440 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| OO5440 | 79.2% | 0.87% | -7 min | 7.3% | 919 |
| SkyWest Airlines on SFO → SNA | 79.7% | 1.33% | -5 min | 5.9% | 10,033 |
| All SFO → SNA flights | 80.2% | 1.13% | -6 min | 5.8% | 13,715 |
Source: FlyerIntel analysis of US DOT BTS data · October 2023 – July 2026
Why OO5440 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 OO5440 on SFO → SNA. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering October 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies OO5440 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, OO5440 pushed back an average of 27 minutes late; when it came in on time or early, an average of 1 minute early.
Each departure is matched to the flight the same aircraft flew into SFO just before it, using the tail number in the DOT file, 853 of 911 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 |
|---|---|---|---|
| OO5440 | 33% | 49% | 6% |
| Network, same turn | 17% | 68% | 9% |
The schedule leaves a normal turn: enough time to clean and board if the aircraft is on time, little to spare if it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often OO5440’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often OO5440 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 October 2023 – July 2026
From pushback to gate
When it leaves SFO late, does that still matter by the time it reaches SNA?
OO5440 pushes back an average of 12.4 minutes late and reaches the gate at SNA an average of 5.2 minutes late. The 7.2 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. Its 21.5 minutes on the taxiways at SFO is about what any departure from the airport in that hour spends.
On arrival at SNA, OO5440 spends 7.9 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 1.2 minutes longer than a typical SNA arrival (6.7 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 SNA. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 33,066 departures from SFO scheduled in the clock hour OO5440 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at SNA (137,357 flights), not just OO5440’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · October 2023 – July 2026
The hour it leaves SFO
Part of any flight’s record belongs to the clock rather than to the flight. OO5440 has one departure time, so this is what that time is worth.
On-time arrival rate. 33,066 departures from SFO are scheduled in the 1 PM–2 PM hour over the period, against 435,779 across the whole day.
OO5440 is scheduled out of SFO at 1:30 PM, in the 1 PM–2 PM bank. Departures from SFO in that hour arrive on time 73.7% of the time against 78.7% across the airport’s whole day — the slot alone is worth 5.0 points worse before anything about this particular flight is considered.
The two airport figures cover every departure from SFO 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 · October 2023 – July 2026 · Hours below 120 departures are not scored.
By day of week
Does OO5440 run worse on particular days?
Saturday is historically the most reliable day and Sunday the least, a gap of 13.1 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · October 2023 – July 2026 · 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 | May 1–21, 2025 | 21 | — |
| LEX→ORD Lexington to Chicago | April 1–30, 2025 | 16 | — |
| EGE→DEN Eagle to Denver | December 14–20, 2023 | 7 | — |
| SMF→SFO Sacramento to San Francisco | September 29, 2023 – October 28, 2023 | 28 | — |
| SAN→SFO San Diego to San Francisco | October 14–15, 2023 | 2 | — |
| GRB→ORD Green Bay to Chicago | September 1, 2023 | 1 | — |
| LAX→LAS Los Angeles to Las Vegas | July 2, 2023 – August 31, 2023 | 49 | — |
| ORD→MSN Chicago to Madison | July 1–29, 2023 | 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 919 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering October 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 |
|---|---|---|---|---|
| OO5440 this flight | SkyWest Airlines | 79.2% | 7 min early | 919 |
| OO3494 | SkyWest Airlines | 76.2% | 3 min early | 667 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. OO5440 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 919 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 · 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