Flight number record

OO 5440

SkyWest Airlines · San Francisco to Santa Ana

Route: SFO → SNA
Departs: 13:30
Flights: 360
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 360 flights, with a median arrival 8 minutes early.

On time

77.3%

Arrivals under 15 minutes late, of 357 completed flights

Avg delay

60 min

Across delayed arrivals only, not all flights

Cancelled

0.56%

National rate is 1.89%

1 hour+ late

7.6%

National rate is 8.3%

These figures cover 360 flights between September 2025 and August 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.

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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 90 of 360 flights, with 13:39 (82 flights) and 13:50 (49 flights) next.

Departs 13:3090 flights25.0%
Departs 13:3982 flights22.8%
Departs 13:5049 flights13.6%

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 13:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5440 runs level with that at 77.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

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Against the route

OO 5440 next to SFO to SNA

Every carrier on SFO to SNA combined arrived on time 77.4% of the time across 4,701 flights, so OO 5440 is about level with it. SkyWest flew 3,497 flights on the same city pair under all its flight numbers, including this one, and those ran 76.9% on time. Across its whole network SkyWest Airlines managed 78.7%, 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	77.3%	60 min	0.56%	B+
All SkyWest Airlines on SFO–SNA	3,497	76.9%	61 min	1.69%	B
All carriers on SFO–SNA	4,701	77.4%	61 min	1.43%	B
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	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 93.3% on time and its weakest Apr–Jun 2026 at 64.0%, a swing of 29 points on roughly 72 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 flights93.3%
Oct–Dec 202591 flights80.2%
Jan–Mar 202686 flights81.2%
Apr–Jun 202691 flights64.0%
Jul–Sep 202662 flights79.0%

Scale runs 55% to 100%.

By weekday, OO 5440 did best on Saturday at 85.4% on time and worst on Sunday at 73.1%. Each day rests on about 51 flights, so a gap of 12 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late OO 5440 runs when it is late

OO 5440 often beats the schedule: 121 of 357 completed flights, 34%, arrived 15 minutes or more early. The 81 late arrivals split 26 under half an hour, 28 between 30 and 60 minutes, and 27 an hour or more.

15+ min early121 flights33.9%
Within 15 min155 flights43.4%
15–29 min late26 flights7.3%
30–59 min late28 flights7.8%
1–2 hours late15 flights4.2%
2+ hours late12 flights3.4%

Scale runs 0% to 100%.

Share of 357 completed flights by arrival against schedule.

23 of 99 late departures made up the time and arrived on time, 23% of them. Only 5 left on time and still arrived late.

The worst days

Worst days for OO 5440

The latest arrival of the period was on 17 August 2026, 4 hours 20 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The five worst days are spread across August, January, June and February, with no single month standing out.

The latest arrivals of OO 5440 in the period
Date	Arrived late by	Largest filed cause
17 August 2026	4 hours 20 minutes	National Airspace System
5 January 2026	3 hours 53 minutes	Carrier
12 June 2026	3 hours 35 minutes	Late-arriving aircraft
17 January 2026	2 hours 41 minutes	Carrier
5 February 2026	2 hours 35 minutes	Late-arriving aircraft

Delay causes

Why OO 5440 runs late

Late-arriving aircraft accounts for 42% of the 4,856 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
42%
National Airspace System
34%
Carrier
23%

42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,856 reported delay minutes here, that single category outweighs weather by 42 to one. The split is drawn from 4,856 delay minutes reported on OO 5440.

Cancellations are rare at 0.56%, below the national 1.89% 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

7.6% of arrivals land an hour or more late, close to the national 8.3%, so 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.

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 77.3% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures