Flight number record

OO 3347

SkyWest Airlines · San Diego to San Francisco

Route: SAN → SFO
Departs: 09:10
Flights: 276
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 276 flights, with a median arrival 1 minute early.

The national on-time rate over the same period is 77.6%, so OO 3347 runs 10 points behind the country as a whole. Across a thousand flights that is about 102 extra late arrivals.

On time

67.4%

Arrivals under 15 minutes late, of 270 completed flights

Avg delay

67 min

Across delayed arrivals only, not all flights

Cancelled

1.81%

National rate is 1.81%

1 hour+ late

13.0%

National rate is 8.1%

These figures cover 276 flights between July 2025 and June 2026. Beyond the headline rate, 13.0% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When OO 3347 flies

OO 3347 flies SAN to SFO without a single fixed slot. Its most common scheduled departure was 09:10, used on 52 of 276 flights, with 10:59 (50 flights) and 11:28 (39 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 09:1052 flights18.8%
Departs 10:5950 flights18.1%
Departs 11:2839 flights14.1%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 09:10 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 3347 runs 17 points worse at 67.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

OO 3347 next to SAN to SFO

Every carrier on SAN to SFO combined arrived on time 65.0% of the time across 6,583 flights, so OO 3347 is 2 points ahead of it. SkyWest flew 1,551 flights on the same city pair under all its flight numbers, including this one, and those ran 68.0% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 12 points.

OO 3347 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3347thin sample	276	67.4%	67 min	1.81%	C
All SkyWest Airlines on SAN–SFO	1,551	68.0%	62 min	1.74%	C
All carriers on SAN–SFO	6,583	65.0%	61 min	1.26%	C
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	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 Apr–Jun 2026 at 45.2%, a swing of 41 points on roughly 69 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 202592 flights73.9%
Oct–Dec 202591 flights60.5%
Jan–Mar 202651 flights86.0%
Apr–Jun 202642 flights45.2%

Scale runs 35% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3347 did best on Tuesday at 75.6% on time and worst on Friday at 52.6%. Each day rests on about 39 flights, so a gap of 23 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 3347 runs late

One category carries most of the weight here. National Airspace System accounts for 48% of the 5,893 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

National Airspace System
48%
Late-arriving aircraft
37%
Carrier
13%
Extreme weather
2%

37% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 5,893 reported delay minutes here, that single category outweighs weather by 17 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 5,893 delay minutes reported on OO 3347.

Cancellations sit at 1.81% against a national 1.81%, which is ordinary. Diversions add another 0.36%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 13.0% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. 13.0% 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.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures