Flight number record
OO 5491
SkyWest Airlines · San Francisco to Pasco
- Route
- SFO → PSC
- Departs
- 09:30
- Flights
- 253
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 253 flights, with a median arrival 6 minutes early.
Set against the rest of the country, OO 5491's record is 10 points better than the US average of 77.3%. That gap is worth roughly 104 fewer late arrivals for every thousand flights.
Key figures
On time
87.7%
Arrivals under 15 minutes late, of 253 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
3.6%
National rate is 8.3%
These figures cover 253 flights between September 2025 and August 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.
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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 98 of 253 flights, with 09:15 (35 flights) and 09:29 (26 flights) next.
- Departs 09:3098 flights38.7%
- Departs 09:1535 flights13.8%
- Departs 09:2926 flights10.3%
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 09:30 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 5491 runs 4 points better at 87.7%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 5491 next to SFO to PSC
Every carrier on SFO to PSC combined arrived on time 81.0% of the time across 576 flights, so OO 5491 is 7 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5491thin sample | 253 | 87.7% | 64 min | 0.00% | A+ |
| All SkyWest Airlines on SFO–PSC | 576 | 81.0% | 99 min | 0.17% | B+ |
| All carriers on SFO–PSC | 576 | 81.0% | 99 min | 0.17% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | 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 63 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 flights90.0%
- Oct–Dec 202592 flights94.6%
- Jan–Mar 202675 flights85.3%
- Apr–Jun 202656 flights78.6%
Scale runs 70% to 100%.
By weekday, OO 5491 ranged from 81.2% on Wednesday to 92.1% on Monday. With about 36 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.
Arrival by arrival
How late OO 5491 runs when it is late
OO 5491 often beats the schedule: 66 of 253 completed flights, 26%, arrived 15 minutes or more early. The 31 late arrivals split 14 under half an hour, 8 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early66 flights26.1%
- Within 15 min156 flights61.7%
- 15–29 min late14 flights5.5%
- 30–59 min late8 flights3.2%
- 1–2 hours late4 flights1.6%
- 2+ hours late5 flights2.0%
Scale runs 0% to 100%.
Share of 253 completed flights by arrival against schedule.
A late pushback is often recovered here: of 48 departures that left 15 minutes late or more, 18 still arrived on time. Only 1 left on time and still arrived late.
The worst days
Worst days for OO 5491
The latest arrival of the period was on 26 February 2026, 5 hours 19 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across February, May, January and March, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 February 2026 | 5 hours 19 minutes | Extreme weather |
| 12 May 2026 | 3 hours 39 minutes | Carrier |
| 4 January 2026 | 3 hours 8 minutes | Late-arriving aircraft |
| 20 February 2026 | 2 hours 41 minutes | Late-arriving aircraft |
| 8 March 2026 | 2 hours 18 minutes | National Airspace System |
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 1,995 reported delay minutes.
- 30%Late-arriving aircraft
- 26%Carrier
- 25%National Airspace System
- 19%Extreme weather
Extreme weather accounts for 19% 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 3.2 times the usual weather exposure. The split is drawn from 1,995 delay minutes reported on OO 5491.
Cancellations are rare at 0.00%, below the national 1.89% 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 3.6% land an hour or more behind schedule, against 8.3% 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.
The same number turns up on five other city pairs in the data, including IAH to MAF (28), DEN to GJT (21) and DFW to IAH (9), 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. 253 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: 87.7% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- San Francisco International (SFO) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
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 ; recomputed monthly. How this data is collected.