Flight number record
OO 3251
SkyWest Airlines · Santa Ana to San Francisco
- Route
- SNA → SFO
- Departs
- 06:45
- Flights
- 287
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3251, check with SkyWest Airlines. SkyWest Airlines flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.
OO 3251 earns an A−. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 287 flights, with a median arrival 10 minutes early.
Set against the rest of the country, OO 3251's record is 13 points better than the US average of 77.3%. That gap is worth roughly 132 fewer late arrivals for every thousand flights.
Key figures
On time
90.5%
Arrivals under 15 minutes late, of 263 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
4.53%
National rate is 1.89%
1 hour+ late
2.7%
National rate is 8.3%
These figures cover 287 flights between September 2025 and August 2026. The median arrival is 10 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When OO 3251 flies
OO 3251 is scheduled to leave Santa Ana (SNA) at 06:45 local time and reach San Francisco (SFO) at 08:32. That slot held for 253 of the 287 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 06:45253 flights88.2%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 06:45 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 3251 runs level with that at 90.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 3251 next to SNA to SFO
Every carrier on SNA to SFO combined arrived on time 65.5% of the time across 4,771 flights, so OO 3251 is 25 points ahead of it. SkyWest flew 3,567 flights on the same city pair under all its flight numbers, including this one, and those ran 66.4% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3251thin sample | 287 | 90.5% | 57 min | 4.53% | A− |
| All SkyWest Airlines on SNA–SFO | 3,567 | 66.4% | 66 min | 1.88% | C |
| All carriers on SNA–SFO | 4,771 | 65.5% | 66 min | 1.70% | C |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3251 quarter by quarter
OO 3251 did not run the same all year. Its best quarter was Oct–Dec 2025 at 97.2% on time and its weakest Jul–Sep 2026 at 80.4%, a swing of 17 points on roughly 57 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights90.0%
- Oct–Dec 202578 flights97.2%
- Jan–Mar 202670 flights97.1%
- Apr–Jun 202649 flights81.4%
- Jul–Sep 202660 flights80.4%
Scale runs 70% to 100%.
By weekday, OO 3251 ranged from 90.2% on Saturday to 97.7% on Friday. With about 41 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 3251 runs when it is late
OO 3251 often beats the schedule: 89 of 263 completed flights, 34%, arrived 15 minutes or more early. The 25 late arrivals split 8 under half an hour, 10 between 30 and 60 minutes, and 7 an hour or more.
- 15+ min early89 flights33.8%
- Within 15 min149 flights56.7%
- 15–29 min late8 flights3.0%
- 30–59 min late10 flights3.8%
- 1–2 hours late4 flights1.5%
- 2+ hours late3 flights1.1%
Scale runs 0% to 100%.
Share of 263 completed flights by arrival against schedule.
4 of 21 late departures made up the time and arrived on time, 19% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for OO 3251
The latest arrival of the period was on 15 August 2026, 3 hours 50 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across August, May and November, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 August 2026 | 3 hours 50 minutes | Extreme weather |
| 5 August 2026 | 2 hours 55 minutes | Carrier |
| 19 May 2026 | 2 hours 14 minutes | National Airspace System |
| 24 November 2025 | 1 hour 45 minutes | Late-arriving aircraft |
| 30 May 2026 | 1 hour 35 minutes | Late-arriving aircraft |
Delay causes
Why OO 3251 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 1,415 reported delay minutes.
- 42%National Airspace System
- 28%Carrier
- 19%Extreme weather
- 12%Late-arriving aircraft
Extreme weather accounts for 19% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 3.1 times the usual weather exposure. The split is drawn from 1,415 delay minutes reported on OO 3251.
Cancellations run at 4.53%, against 1.89% nationally. That is roughly one flight in twenty cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.7% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
Every one of the 287 flights under OO 3251 in the data flew SNA to SFO. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 287 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking OO 3251
For a booking, the cancellation rate is the figure to plan around on OO 3251: 4.53% of its 287 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- SNA to SFO, every carrier and departure
- SFO to SNA, the return direction
- John Wayne Airport (SNA) delay statistics
- San Francisco International (SFO) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- What a cancellation rate actually tells you (and what it hides)
A flight number here means SkyWest Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.