Flight number record

OO 5480

SkyWest Airlines · San Francisco to Arcata/Eureka

Route: SFO → ACV
Departs: 16:35
Flights: 266
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 lands a B−, about a point worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 266 flights, with a median arrival 4 minutes early.

On time

76.8%

Arrivals under 15 minutes late, of 250 completed flights

Avg delay

72 min

Across delayed arrivals only, not all flights

Cancelled

4.14%

National rate is 1.81%

1 hour+ late

8.8%

National rate is 8.1%

These figures cover 266 flights between July 2025 and June 2026. Beyond the headline rate, 8.8% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When OO 5480 flies

OO 5480 flies SFO to ACV without a single fixed slot. Its most common scheduled departure was 16:35, used on 52 of 266 flights, with 16:22 (52 flights) and 16:31 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 16:3552 flights19.5%
Departs 16:2252 flights19.5%
Departs 16:3138 flights14.3%

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 16:35 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and OO 5480 runs 4 points better at 76.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 5480 next to SFO to ACV

Every carrier on SFO to ACV combined arrived on time 76.4% of the time across 1,285 flights, so OO 5480 is about level with it. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 2 points.

OO 5480 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5480thin sample	266	76.8%	72 min	4.14%	B−
All SkyWest Airlines on SFO–ACV	1,285	76.4%	91 min	2.72%	B
All carriers on SFO–ACV	1,285	76.4%	91 min	2.72%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	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 87.0% on time and its weakest Apr–Jun 2026 at 67.1%, a swing of 20 points on roughly 89 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 202578 flights87.0%
Oct–Dec 202591 flights77.0%
Jan–Mar 20268 flights—
Apr–Jun 202689 flights67.1%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5480 did best on Saturday at 93.3% on time and worst on Thursday at 71.1%. Each day rests on about 38 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

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 4,179 reported delay minutes.

National Airspace System
30%
Extreme weather
26%
Late-arriving aircraft
26%
Carrier
17%

Extreme weather accounts for 26% 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 4.2 times the usual weather exposure. The split is drawn from 4,179 delay minutes reported on OO 5480.

Cancellations run at 4.14%, against 1.81% 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

8.8% 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 a little over an hour, which a normal layover absorbs.

The same number turns up on three other city pairs in the data, including ASE to SFO (57), SEA to LAX (20) and SFO to AUS (1), 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. 266 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: 4.14% of its 266 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.

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