Flight number record
OO 5480
SkyWest Airlines · San Francisco to Arcata/Eureka
- Route
- SFO → ACV
- Departs
- 16:31
- Flights
- 269
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5480, 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 5480 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 269 flights, with a median arrival 5 minutes early.
The national on-time rate over the same period is 77.3%, so OO 5480 runs 5 points behind the country as a whole. Across a thousand flights that is about 54 extra late arrivals.
Key figures
On time
71.9%
Arrivals under 15 minutes late, of 253 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
3.72%
National rate is 1.89%
1 hour+ late
10.7%
National rate is 8.3%
These figures cover 269 flights between September 2025 and August 2026. Beyond the headline rate, 10.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5480 flies
OO 5480 flies SFO to ACV without a single fixed slot. Its most common scheduled departure was 16:31, used on 74 of 269 flights, with 16:22 (52 flights) and 16:35 (52 flights) next.
- Departs 16:3174 flights27.5%
- Departs 16:2252 flights19.3%
- Departs 16:3552 flights19.3%
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 16:31 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 5480 runs level with that at 71.9%. 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 5480 next to SFO to ACV
Every carrier on SFO to ACV combined arrived on time 73.3% of the time across 1,293 flights, so OO 5480 is about level with it. SkyWest flew 1,272 flights on the same city pair under all its flight numbers, including this one, and those ran 73.5% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5480thin sample | 269 | 71.9% | 69 min | 3.72% | C− |
| All SkyWest Airlines on SFO–ACV | 1,272 | 73.5% | 93 min | 2.52% | C |
| All carriers on SFO–ACV | 1,293 | 73.3% | 92 min | 2.47% | C |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5480 quarter by quarter
OO 5480 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Jul–Sep 2026 at 64.0%, a swing of 19 points on roughly 67 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 flights83.3%
- Oct–Dec 202591 flights77.0%
- Jan–Mar 20268 flights—
- Apr–Jun 202689 flights67.1%
- Jul–Sep 202651 flights64.0%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5480 did best on Tuesday at 82.9% on time and worst on Thursday at 57.9%. Each day rests on about 38 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5480 runs when it is late
OO 5480 often beats the schedule: 66 of 253 completed flights, 26%, arrived 15 minutes or more early. The 71 late arrivals split 21 under half an hour, 23 between 30 and 60 minutes, and 27 an hour or more.
- 15+ min early66 flights26.1%
- Within 15 min116 flights45.8%
- 15–29 min late21 flights8.3%
- 30–59 min late23 flights9.1%
- 1–2 hours late20 flights7.9%
- 2+ hours late7 flights2.8%
Scale runs 0% to 100%.
Share of 253 completed flights by arrival against schedule.
15 of 78 late departures made up the time and arrived on time, 19% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for OO 5480
The latest arrival of the period was on 2 September 2025, 16 hours 54 minutes behind schedule; most of its delay minutes were filed as extreme weather. On four of the five worst days the largest share was filed as national airspace system delay.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 September 2025 | 16 hours 54 minutes | Extreme weather |
| 18 June 2026 | 3 hours | National Airspace System |
| 20 July 2026 | 2 hours 39 minutes | National Airspace System |
| 5 November 2025 | 2 hours 20 minutes | National Airspace System |
| 26 December 2025 | 2 hours 11 minutes | National Airspace System |
Delay causes
Why OO 5480 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 4,870 reported delay minutes.
- 34%National Airspace System
- 30%Late-arriving aircraft
- 23%Extreme weather
- 14%Carrier
Extreme weather accounts for 23% 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 3.8 times the usual weather exposure. The split is drawn from 4,870 delay minutes reported on OO 5480.
Cancellations run at 3.72%, against 1.89% nationally. That is about one flight in 25 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
10.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The same number turns up on four other city pairs in the data, including ASE to SFO (57), SEA to LAX (20) and SFO to AUS (6), but none flew often enough under OO 5480 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to ACV only.
One caution: this is a thin sample. 269 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 5480
For a booking, the cancellation rate is the figure to plan around on OO 5480: 3.72% of its 269 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- SFO to ACV, every carrier and departure
- ACV to SFO, the return direction
- SkyWest Airlines 4708 on the same route70.5%
- SkyWest Airlines 4695 on the same route72.8%
- 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
- How often a connection fails at the major US hubs
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.