Flight number record
OO 3347
SkyWest Airlines · San Diego to San Francisco
- Route
- SAN → SFO
- Departs
- 11:04
- Flights
- 276
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3347, 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 3347 earns a D, which is as low as this site's scale goes for a reason. Only 56.3% of flights arrive inside the 15-minute window, 21 points worse than the national rate of 77.3%. Late arrivals average about an hour. Treat any tight connection here as a coin flip. That rests on 276 flights, with a median arrival 6 minutes late.
The national on-time rate over the same period is 77.3%, so OO 3347 runs 21 points behind the country as a whole. Across a thousand flights that is about 210 extra late arrivals.
Key figures
On time
56.3%
Arrivals under 15 minutes late, of 270 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
1.81%
National rate is 1.89%
1 hour+ late
14.8%
National rate is 8.3%
These figures cover 276 flights between September 2025 and August 2026. Beyond the headline rate, 14.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When OO 3347 flies
OO 3347 flies SAN to SFO without a single fixed slot. Its most common scheduled departure was 11:04, used on 70 of 276 flights, with 09:10 (52 flights) and 10:25 (35 flights) next.
- Departs 11:0470 flights25.4%
- Departs 09:1052 flights18.8%
- Departs 10:2535 flights12.7%
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 11:04 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 3347 runs 22 points worse at 56.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
OO 3347 next to SAN to SFO
Every carrier on SAN to SFO combined arrived on time 59.5% of the time across 6,763 flights, so OO 3347 is 3 points behind it. SkyWest flew 1,482 flights on the same city pair under all its flight numbers, including this one, and those ran 59.8% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 22 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3347thin sample | 276 | 56.3% | 62 min | 1.81% | D |
| All SkyWest Airlines on SAN–SFO | 1,482 | 59.8% | 64 min | 1.96% | D |
| All carriers on SAN–SFO | 6,763 | 59.5% | 60 min | 1.29% | D |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3347 quarter by quarter
OO 3347 did not run the same all year. Its best quarter was Jan–Mar 2026 at 86.0% on time and its weakest Jul–Sep 2026 at 22.6%, a swing of 63 points on roughly 55 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 flights80.0%
- Oct–Dec 202591 flights60.5%
- Jan–Mar 202651 flights86.0%
- Apr–Jun 202642 flights45.2%
- Jul–Sep 202662 flights22.6%
Scale runs 15% to 90%.
By weekday, OO 3347 did best on Saturday at 65.7% on time and worst on Friday at 47.4%. Each day rests on about 39 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 3347 runs when it is late
The 118 late arrivals split 31 under half an hour, 47 between 30 and 60 minutes, and 40 an hour or more.
- 15+ min early57 flights21.1%
- Within 15 min95 flights35.2%
- 15–29 min late31 flights11.5%
- 30–59 min late47 flights17.4%
- 1–2 hours late22 flights8.1%
- 2+ hours late18 flights6.7%
Scale runs 0% to 100%.
Share of 270 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 114 departures that left 15 minutes late or more, only 5 made it up before arrival. 9 flights left on time and still arrived late.
The worst days
Worst days for OO 3347
The latest arrival of the period was on 12 December 2025, 4 hours 1 minute behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in November 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 12 December 2025 | 4 hours 1 minute | Late-arriving aircraft |
| 7 November 2025 | 3 hours 55 minutes | Carrier |
| 30 November 2025 | 3 hours 41 minutes | Carrier |
| 3 January 2026 | 3 hours 38 minutes | National Airspace System |
| 8 November 2025 | 3 hours 5 minutes | National Airspace System |
Delay causes
Why OO 3347 runs late
National Airspace System accounts for 57% of the 7,335 delay minutes carriers reported here, and the remaining four split what is left.
- 57%National Airspace System
- 29%Late-arriving aircraft
- 11%Carrier
- 3%Extreme weather
57% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 4,200 minutes out of 7,335, against a national NAS share of 21%. The split is drawn from 7,335 delay minutes reported on OO 3347.
Cancellations sit at 1.81% against a national 1.89%, which is ordinary. Diversions add another 0.36%.
Connections and routes
What a delay on this flight costs
14.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The same number turns up on three other city pairs in the data, including SEA to EUG (34), EUG to SEA (34) and LAS to BOI (21), but none flew often enough under OO 3347 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SAN to SFO only.
One caution: this is a thin sample. 276 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 3347
For a booking, OO 3347 is a flight to put a long connection behind. 14.8% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- SAN to SFO, every carrier and departure
- SFO to SAN, the return direction
- United Airlines 2117 on the same route73.3%
- United Airlines 1763 on the same route71.1%
- San Diego International (SAN) 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
- The best time of day to fly, according to 7.05 million flight records
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.