Flight number record
OO 4655
SkyWest Airlines · Arcata/Eureka to San Francisco
- Route
- ACV → SFO
- Departs
- 14:15
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 earns an F+, which is as low as this site's scale goes for a reason. Only 52.1% of flights arrive inside the 15-minute window, 25 points worse than the national rate of 77.3%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 362 flights, with a median arrival 12 minutes late.
The national on-time rate over the same period is 77.3%, so OO 4655 runs 25 points behind the country as a whole. Across a thousand flights that is about 252 extra late arrivals.
Key figures
On time
52.1%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
0.83%
National rate is 1.89%
1 hour+ late
19.2%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. Beyond the headline rate, 19.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 14:05 (82 flights) and 14:08 (55 flights) next.
- Departs 14:1584 flights23.2%
- Departs 14:0582 flights22.7%
- Departs 14:0855 flights15.2%
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 14:15 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 4655 runs 20 points worse at 52.1%. 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 4655 next to ACV to SFO
Every carrier on ACV to SFO combined arrived on time 56.5% of the time across 1,291 flights, so OO 4655 is 4 points behind it. SkyWest flew 1,271 flights on the same city pair under all its flight numbers, including this one, and those ran 57.3% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 27 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4655thin sample | 362 | 52.1% | 69 min | 0.83% | F+ |
| All SkyWest Airlines on ACV–SFO | 1,271 | 57.3% | 80 min | 2.75% | D |
| All carriers on ACV–SFO | 1,291 | 56.5% | 79 min | 2.71% | D |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | 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 73.3% on time and its weakest Apr–Jun 2026 at 29.5%, a swing of 44 points on roughly 72 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 flights73.3%
- Oct–Dec 202592 flights66.7%
- Jan–Mar 202690 flights62.9%
- Apr–Jun 202688 flights29.5%
- Jul–Sep 202662 flights37.1%
Scale runs 20% to 80%.
By weekday, OO 4655 did best on Saturday at 61.5% on time and worst on Friday at 46.2%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4655 runs when it is late
The 172 late arrivals split 53 under half an hour, 50 between 30 and 60 minutes, and 69 an hour or more.
- 15+ min early69 flights19.2%
- Within 15 min118 flights32.9%
- 15–29 min late53 flights14.8%
- 30–59 min late50 flights13.9%
- 1–2 hours late45 flights12.5%
- 2+ hours late24 flights6.7%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 115 departures that left 15 minutes late or more, only 5 made it up before arrival. In the other direction, 62 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SFO.
The worst days
Worst days for OO 4655
The latest arrival of the period was on 13 February 2026, 10 hours 6 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 February 2026 | 10 hours 6 minutes | Carrier |
| 30 September 2025 | 4 hours 52 minutes | Carrier |
| 2 January 2026 | 4 hours 36 minutes | Carrier |
| 21 March 2026 | 3 hours 50 minutes | Carrier |
| 15 February 2026 | 3 hours 49 minutes | Late-arriving aircraft |
Delay causes
Why OO 4655 runs late
National Airspace System accounts for 43% of the 12,000 delay minutes carriers reported here, and the remaining four split what is left.
- 43%National Airspace System
- 31%Carrier
- 24%Late-arriving aircraft
- 2%Extreme weather
- 0%Security
43% 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 5,082 minutes out of 12,000, against a national NAS share of 21%. The split is drawn from 11,919 delay minutes reported on OO 4655.
Cancellations are rare at 0.83%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
19.2% 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 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. 19.2% 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.
Related
Where to go next
- ACV to SFO, every carrier and departure
- SFO to ACV, the return direction
- SkyWest Airlines 5313 on the same route72.3%
- 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.