Flight number record

OO 3494

SkyWest Airlines · San Francisco to Santa Ana

Route: SFO → SNA
Departs: 15:42
Flights: 286
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 3494, 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 3494 lands a B+, 4 points better than the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 286 flights, with a median arrival 8 minutes early.

Set against the rest of the country, OO 3494's record is 4 points better than the US average of 77.6%. That gap is worth roughly 42 fewer late arrivals for every thousand flights.

On time

81.8%

Arrivals under 15 minutes late, of 286 completed flights

Avg delay

56 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

6.6%

National rate is 8.1%

These figures cover 286 flights between July 2025 and June 2026. The median arrival is 8 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.

Schedule

When OO 3494 flies

OO 3494 flies SFO to SNA without a single fixed slot. Its most common scheduled departure was 15:42, used on 49 of 286 flights, with 15:21 (45 flights) and 17:00 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:4249 flights17.1%
Departs 15:2145 flights15.7%
Departs 17:0036 flights12.6%

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 15:42 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and OO 3494 runs 9 points better at 81.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 3494 next to SFO to SNA

Every carrier on SFO to SNA combined arrived on time 80.3% of the time across 4,726 flights, so OO 3494 is 2 points ahead of it. SkyWest flew 3,521 flights on the same city pair under all its flight numbers, including this one, and those ran 79.4% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 3 points.

OO 3494 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3494thin sample	286	81.8%	56 min	0.00%	B+
All SkyWest Airlines on SFO–SNA	3,521	79.4%	60 min	1.42%	B
All carriers on SFO–SNA	4,726	80.3%	60 min	1.18%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3494 quarter by quarter

Quarter by quarter OO 3494 held fairly steady: 78.0% in Jul–Sep 2025, 80.6% in Oct–Dec 2025, 87.8% in Jan–Mar 2026 and 80.5% in Apr–Jun 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202591 flights78.0%
Oct–Dec 202572 flights80.6%
Jan–Mar 202682 flights87.8%
Apr–Jun 202641 flights80.5%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3494 did best on Tuesday at 87.8% on time and worst on Sunday at 75.6%. Each day rests on about 41 flights, so a gap of 12 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 3494 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 54% of the 2,891 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
54%
National Airspace System
31%
Carrier
15%

54% 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 2,891 reported delay minutes here, that single category outweighs weather by 54 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 2,891 delay minutes reported on OO 3494.

Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

6.6% 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 an hour, which a normal layover absorbs.

OO 3494 is not only a SFO to SNA flight. It also flew SNA to SFO (281 flights, 70.5% 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. 286 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 3494
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
SNA to SFOthin sample	281	70.5%	61 min	2.14%	C

What to do with this

Booking OO 3494

For a booking, read OO 3494 as 81.8% on time with 0.00% cancelled over 286 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