Flight number record

OO 5440

SkyWest Airlines · San Francisco to Santa Ana

Route: SFO → SNA
Departs: 13:30
Flights: 360
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5440, 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 5440 lands a B+, level with the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about 55 minutes on average. That is a workable record, not a spotless one. That rests on 360 flights, with a median arrival 8 minutes early.

On time

77.9%

Arrivals under 15 minutes late, of 357 completed flights

Avg delay

54 min

Across delayed arrivals only, not all flights

Cancelled

0.56%

National rate is 1.81%

1 hour+ late

6.4%

National rate is 8.1%

These figures cover 360 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 5440 flies

OO 5440 flies SFO to SNA without a single fixed slot. Its most common scheduled departure was 13:30, used on 152 of 360 flights, with 13:50 (49 flights) and 13:05 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:30152 flights42.2%
Departs 13:5049 flights13.6%
Departs 13:0549 flights13.6%

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 13:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 5440 runs level with that at 77.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 5440 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 5440 is 2 points behind 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%, close to this flight's figure.

OO 5440 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5440thin sample	360	77.9%	54 min	0.56%	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 5440 quarter by quarter

OO 5440 did not run the same all year. Its best quarter was Jul–Sep 2025 at 85.9% on time and its weakest Apr–Jun 2026 at 64.0%, a swing of 22 points on roughly 90 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 flights85.9%
Oct–Dec 202591 flights80.2%
Jan–Mar 202686 flights81.2%
Apr–Jun 202691 flights64.0%

Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5440 did best on Saturday at 87.5% on time and worst on Wednesday at 70.6%. Each day rests on about 51 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5440 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 4,277 reported delay minutes.

Late-arriving aircraft
41%
National Airspace System
31%
Carrier
28%

41% 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 4,277 reported delay minutes here, that single category outweighs weather by 41 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 4,277 delay minutes reported on OO 5440.

Cancellations are rare at 0.56%, 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

6.4% 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.

Every one of the 360 flights under OO 5440 in the data flew SFO to SNA. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 360 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 5440

For a booking, read OO 5440 as 77.9% on time with 0.56% cancelled over 360 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