Flight number record

OO 4655

SkyWest Airlines · Arcata/Eureka to San Francisco

Route: ACV → SFO
Departs: 14:15
Flights: 362
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4655, 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 4655 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 362 flights, with a median arrival 5 minutes late.

The national on-time rate over the same period is 77.6%, so OO 4655 runs 17 points behind the country as a whole. Across a thousand flights that is about 168 extra late arrivals.

On time

60.8%

Arrivals under 15 minutes late, of 357 completed flights

Avg delay

77 min

Across delayed arrivals only, not all flights

Cancelled

1.38%

National rate is 1.81%

1 hour+ late

16.8%

National rate is 8.1%

These figures cover 362 flights between July 2025 and June 2026. Beyond the headline rate, 16.8% 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 4655 flies

OO 4655 flies ACV to SFO without a single fixed slot. Its most common scheduled departure was 14:15, used on 84 of 362 flights, with 14:13 (55 flights) and 14:19 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 14:1584 flights23.2%
Departs 14:1355 flights15.2%
Departs 14:1949 flights13.5%

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 14:15 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and OO 4655 runs 12 points worse at 60.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 4655 next to ACV to SFO

Every carrier on ACV to SFO combined arrived on time 63.8% of the time across 1,283 flights, so OO 4655 is 3 points behind it. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 18 points.

OO 4655 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4655thin sample	362	60.8%	77 min	1.38%	D
All SkyWest Airlines on ACV–SFO	1,283	63.8%	87 min	2.96%	D
All carriers on ACV–SFO	1,283	63.8%	87 min	2.96%	D
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4655 quarter by quarter

OO 4655 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Apr–Jun 2026 at 29.5%, a swing of 54 points on roughly 91 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 flights83.3%
Oct–Dec 202592 flights66.7%
Jan–Mar 202690 flights62.9%
Apr–Jun 202688 flights29.5%

Scale runs 20% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4655 ranged from 56.0% on Wednesday to 67.3% on Saturday. With about 52 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 4655 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 11,000 reported delay minutes.

National Airspace System
38%
Carrier
35%
Late-arriving aircraft
22%
Extreme weather
4%
Security
0%

38% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 4,110 minutes out of 11,000, against a national NAS share of 21%. The split is drawn from 10,715 delay minutes reported on OO 4655.

Cancellations sit at 1.38% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 16.8% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

The same number turns up on one other city pair in the data, including LIT to ORD (3), but none flew often enough under OO 4655 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ACV to SFO only.

One caution: this is a thin sample. 362 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 4655

For a booking, OO 4655 is a flight to put a long connection behind. 16.8% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

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