Flight number record
OO 3315
SkyWest Airlines · Santa Rosa to San Diego
- Route
- STS → SAN
- Departs
- 06:26
- Flights
- 303
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3315, 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 3315 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 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 303 flights, with a median arrival 11 minutes early.
Set against the rest of the country, OO 3315's record is 11 points better than the US average of 77.3%. That gap is worth roughly 112 fewer late arrivals for every thousand flights.
Key figures
On time
88.5%
Arrivals under 15 minutes late, of 278 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
7.92%
National rate is 1.89%
1 hour+ late
3.6%
National rate is 8.3%
These figures cover 303 flights between September 2025 and August 2026. The median arrival is 11 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 3315 flies
OO 3315 flies STS to SAN without a single fixed slot. Its most common scheduled departure was 06:26, used on 70 of 303 flights, with 07:00 (35 flights) and 10:51 (34 flights) next.
- Departs 06:2670 flights23.1%
- Departs 07:0035 flights11.6%
- Departs 10:5134 flights11.2%
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 06:26 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 3315 runs level with that at 88.5%. 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 3315 next to STS to SAN
Every carrier on STS to SAN combined arrived on time 73.3% of the time across 1,060 flights, so OO 3315 is 15 points ahead of it. SkyWest flew 830 flights on the same city pair under all its flight numbers, including this one, and those ran 72.9% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3315thin sample | 303 | 88.5% | 72 min | 7.92% | A− |
| All SkyWest Airlines on STS–SAN | 830 | 72.9% | 60 min | 3.73% | C− |
| All carriers on STS–SAN | 1,060 | 73.3% | 60 min | 3.02% | C− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3315 quarter by quarter
OO 3315 did not run the same all year. Its best quarter was Jul–Sep 2026 at 94.6% on time and its weakest Jan–Mar 2026 at 81.6%, a swing of 13 points on roughly 76 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.
- Oct–Dec 202572 flights86.0%
- Jan–Mar 202679 flights81.6%
- Apr–Jun 202690 flights92.1%
- Jul–Sep 202662 flights94.6%
Scale runs 75% to 100%.
By weekday, OO 3315 did best on Tuesday at 93.9% on time and worst on Saturday at 80.5%. Each day rests on about 43 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 3315 runs when it is late
OO 3315 often beats the schedule: 97 of 278 completed flights, 35%, arrived 15 minutes or more early. The 32 late arrivals split 13 under half an hour, 9 between 30 and 60 minutes, and 10 an hour or more.
- 15+ min early97 flights34.9%
- Within 15 min149 flights53.6%
- 15–29 min late13 flights4.7%
- 30–59 min late9 flights3.2%
- 1–2 hours late5 flights1.8%
- 2+ hours late5 flights1.8%
Scale runs 0% to 100%.
Share of 278 completed flights by arrival against schedule.
3 of 24 late departures made up the time and arrived on time, 13% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for OO 3315
The latest arrival of the period was on 27 May 2026, 5 hours 56 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 May 2026 | 5 hours 56 minutes | Carrier |
| 16 May 2026 | 5 hours 50 minutes | Late-arriving aircraft |
| 22 November 2025 | 3 hours 2 minutes | Carrier |
| 15 June 2026 | 2 hours 19 minutes | Carrier |
| 16 February 2026 | 2 hours 14 minutes | National Airspace System |
Delay causes
Why OO 3315 runs late
Carrier accounts for 50% of the 2,309 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Carrier
- 27%Late-arriving aircraft
- 12%National Airspace System
- 11%Extreme weather
The largest share of delay minutes, 50%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,160 of the 2,309 delay minutes reported here. The split is drawn from 2,309 delay minutes reported on OO 3315.
Cancellations run at 7.92%, against 1.89% nationally. That is about one flight in twelve 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 3.6% 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.
The 508 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on one other city pair in the data, including SMF to PDX (24), but none flew often enough under OO 3315 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to STS to SAN only.
One caution: this is a thin sample. 303 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 3315
For a booking, the cancellation rate is the figure to plan around on OO 3315: 7.92% of its 303 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- STS to SAN, every carrier and departure
- SAN to STS, the return direction
- San Diego International (SAN) 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.