Flight number record

OO 5491

SkyWest Airlines · San Francisco to Pasco

Route: SFO → PSC
Departs: 09:30
Flights: 315
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5491, 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 5491 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 12 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 315 flights, with a median arrival 6 minutes early.

Set against the rest of the country, OO 5491's record is 12 points better than the US average of 77.6%. That gap is worth roughly 116 fewer late arrivals for every thousand flights.

On time

89.2%

Arrivals under 15 minutes late, of 315 completed flights

Avg delay

70 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

3.5%

National rate is 8.1%

These figures cover 315 flights between July 2025 and June 2026. The median arrival is 6 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 5491 flies

OO 5491 flies SFO to PSC without a single fixed slot. Its most common scheduled departure was 09:30, used on 159 of 315 flights, with 09:15 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 09:30159 flights50.5%
Departs 09:1535 flights11.1%

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 09:30 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and OO 5491 runs 5 points better at 89.2%. 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 5491 next to SFO to PSC

Every carrier on SFO to PSC combined arrived on time 79.9% of the time across 606 flights, so OO 5491 is 9 points ahead of it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 10 points.

OO 5491 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5491thin sample	315	89.2%	70 min	0.00%	A+
All SkyWest Airlines on SFO–PSC	606	79.9%	94 min	0.17%	B+
All carriers on SFO–PSC	606	79.9%	94 min	0.17%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5491 quarter by quarter

OO 5491 did not run the same all year. Its best quarter was Oct–Dec 2025 at 94.6% on time and its weakest Apr–Jun 2026 at 78.6%, a swing of 16 points on roughly 79 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 flights93.5%
Oct–Dec 202592 flights94.6%
Jan–Mar 202675 flights85.3%
Apr–Jun 202656 flights78.6%

Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5491 ranged from 83.0% on Friday to 93.6% on Saturday. With about 45 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 5491 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 2,386 reported delay minutes.

Late-arriving aircraft
32%
Carrier
30%
National Airspace System
21%
Extreme weather
16%

Extreme weather accounts for 16% 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 2.6 times the usual weather exposure. The split is drawn from 2,386 delay minutes reported on OO 5491.

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

Badly late arrivals are rare here: only 3.5% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

The 620 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The same number turns up on four other city pairs in the data, including IAH to MAF (28), DFW to IAH (9) and ORF to ORD (4), but none flew often enough under OO 5491 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to PSC only.

One caution: this is a thin sample. 315 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 5491

For a booking, OO 5491 has one of the better records a US domestic flight can show: 89.2% on time and 0.00% cancelled. That is a base rate, not a promise about any single 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