Flight number record

OO 3491

SkyWest Airlines · Fresno to San Diego

Route: FAT → SAN
Departs: 15:49
Flights: 260
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 3491, 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 3491 sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.6%. The late ones land about 55 minutes behind schedule. That rests on 260 flights, with a median arrival 3 minutes early.

On time

74.9%

Arrivals under 15 minutes late, of 259 completed flights

Avg delay

54 min

Across delayed arrivals only, not all flights

Cancelled

0.38%

National rate is 1.81%

1 hour+ late

8.1%

National rate is 8.1%

These figures cover 260 flights between July 2025 and June 2026. Beyond the headline rate, 8.1% 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 3491 flies

OO 3491 flies FAT to SAN without a single fixed slot. Its most common scheduled departure was 15:49, used on 45 of 260 flights, with 13:40 (43 flights) and 10:28 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:4945 flights17.3%
Departs 13:4043 flights16.5%
Departs 10:2836 flights13.8%

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 15:49 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and OO 3491 runs 3 points better at 74.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 3491 next to FAT to SAN

Every carrier on FAT to SAN combined arrived on time 76.2% of the time across 1,747 flights, so OO 3491 is about level with it. SkyWest flew 1,235 flights on the same city pair under all its flight numbers, including this one, and those ran 76.7% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 4 points.

OO 3491 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3491thin sample	260	74.9%	54 min	0.38%	C+
All SkyWest Airlines on FAT–SAN	1,235	76.7%	53 min	1.62%	B
All carriers on FAT–SAN	1,747	76.2%	53 min	1.26%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3491 quarter by quarter

OO 3491 did not run the same all year. Its best quarter was Jan–Mar 2026 at 83.9% on time and its weakest Oct–Dec 2025 at 60.4%, a swing of 24 points on roughly 87 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 flights82.4%
Oct–Dec 202591 flights60.4%
Jan–Mar 202656 flights83.9%
Apr–Jun 202621 flights—

Scale runs 50% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3491 did best on Saturday at 88.9% on time and worst on Friday at 59.5%. Each day rests on about 37 flights, so a gap of 29 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 3491 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 43% of the 3,531 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.

Late-arriving aircraft
43%
National Airspace System
23%
Carrier
22%
Extreme weather
12%

Extreme weather accounts for 12% 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 1.9 times the usual weather exposure. The split is drawn from 3,531 delay minutes reported on OO 3491.

Cancellations are rare at 0.38%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

8.1% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 55 minutes, which a normal layover absorbs.

OO 3491 is not only a FAT to SAN flight. It also flew SAN to FAT (253 flights, 81.6% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

One caution: this is a thin sample. 260 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.

Other routes flown as OO 3491
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
SAN to FATthin sample	253	81.6%	48 min	1.19%	B

What to do with this

Booking OO 3491

For a booking, read OO 3491 as 74.9% on time with 0.38% cancelled over 260 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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