Flight profile · SkyWest Airlines
OO3494
San Francisco (SFO) to Santa Ana (SNA) · scheduled 3:42 PM – 5:20 PM
How OO3494 performs
667 operations, January 2024 – July 2026.
OO3494 arrived on time 76.2% of the time, against 80.2% for all SFO → SNA flights, so this departure is 4.0 percentage points worse than the route as a whole. Against SkyWest Airlines’ own flights on this route it is 3.5 points worse.
Source: US DOT Bureau of Transportation Statistics · 667 operations, January 2024 – July 2026 · If OO3494 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where OO3494 is right now
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| OO3494 | 76.2% | 0.60% | -3 min | 6.9% | 667 |
| 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 · January 2024 – July 2026
Why OO3494 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding and fueling, all within the carrier’s control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for OO3494 on SFO → SNA. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering January 2024 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies OO3494 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, OO3494 pushed back an average of 34 minutes late; when it came in on time or early, an average of 2 minutes 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, 646 of 663 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 |
|---|---|---|---|
| OO3494 | 29% | 64% | 5% |
| Network, same turn | 18% | 92% | 12% |
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 OO3494’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often OO3494 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 January 2024 – July 2026
From pushback to gate
When it leaves SFO late, does that still matter by the time it reaches SNA?
OO3494 pushes back an average of 9.6 minutes late and reaches the gate at SNA an average of 7.0 minutes late. The 2.6 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 18.4 minutes on the taxiways at SFO is about what any departure from the airport in that hour spends.
On arrival at SNA, OO3494 spends 7.2 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 SNA 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 SNA. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 10,863 departures from SFO scheduled in the clock hour OO3494 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 OO3494’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · January 2024 – July 2026
The hour it leaves SFO
Part of any flight’s record belongs to the clock rather than to the flight. OO3494 has one departure time, so this is what that time is worth.
On-time arrival rate. 10,863 departures from SFO are scheduled in the 3 PM–4 PM hour over the period, against 435,779 across the whole day.
OO3494 is scheduled out of SFO at 3:42 PM, in the 3 PM–4 PM bank. Departures from SFO in that hour arrive on time 70.2% of the time against 78.7% across the airport’s whole day — the slot alone is worth 8.6 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 · January 2024 – July 2026 · Hours below 120 departures are not scored.
Other routes OO3494 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 |
|---|---|---|---|
| SNA→SFO Santa Ana to San Francisco | January 8, 2024 – May 12, 2026 | 478 | 67.0% |
| SJC→SNA San Jose to Santa Ana | May 23, 2024 – April 20, 2026 | 2 | — |
| BOI→PDX Boise to Portland | October 27, 2024 – April 21, 2025 | 157 | 78.1% |
| PDX→BOI Portland to Boise | January 6, 2025 – February 10, 2025 | 26 | — |
| SBP→SEA San Luis Obispo to Seattle | December 14, 2023 – January 7, 2024 | 25 | — |
| SEA→SBP Seattle to San Luis Obispo | December 14, 2023 – January 7, 2024 | 25 | — |
| PDX→SLC Portland to Salt Lake City | November 23, 2023 | 1 | — |
| PSP→SFO Palm Springs to San Francisco | November 17, 2023 | 1 | — |
| SFO→PSP San Francisco to Palm Springs | November 17, 2023 | 1 | — |
| SFO→LAX San Francisco to Los Angeles | November 16, 2023 | 1 | — |
| SAN→SEA San Diego to Seattle | November 7–14, 2023 | 2 | — |
| SEA→SAN Seattle to San Diego | November 7–14, 2023 | 2 | — |
| AUS→SAN Austin to San Diego | October 7, 2023 – November 11, 2023 | 6 | — |
| SAN→AUS San Diego to Austin | October 7, 2023 – November 11, 2023 | 6 | — |
| SEA→SFO Seattle to San Francisco | October 19, 2023 | 1 | — |
| SFO→SAN San Francisco to San Diego | September 6–30, 2023 | 25 | — |
| JAC→SFO Jackson to San Francisco | July 1, 2023 – September 3, 2023 | 29 | — |
| SFO→JAC San Francisco to Jackson | July 1, 2023 – September 3, 2023 | 29 | — |
Because the same number has served different journeys, the statistics above describe only the route OO3494 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.
45 min late
against a median of 3 min early
Percentiles over 667 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering January 2024 – 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 | SkyWest Airlines | 79.2% | 7 min early | 919 |
| OO3494 this flight | 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. OO3494 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 667 records of OO3494 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
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