Flight number record
OO 4779
SkyWest Airlines · Reno to San Francisco
- Route
- RNO → SFO
- Departs
- 14:05
- Flights
- 253
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4779, 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 4779 earns an F, which is as low as this site's scale goes for a reason. Only 54.4% of flights arrive inside the 15-minute window, 23 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 253 flights, with a median arrival 11 minutes late.
The national on-time rate over the same period is 77.3%, so OO 4779 runs 23 points behind the country as a whole. Across a thousand flights that is about 229 extra late arrivals.
Key figures
On time
54.4%
Arrivals under 15 minutes late, of 248 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
1.58%
National rate is 1.89%
1 hour+ late
14.9%
National rate is 8.3%
These figures cover 253 flights between September 2025 and August 2026. Beyond the headline rate, 14.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4779 flies
OO 4779 flies RNO to SFO without a single fixed slot. Its most common scheduled departure was 14:05, used on 82 of 253 flights, with 14:45 (45 flights) and 15:45 (37 flights) next.
- Departs 14:0582 flights32.4%
- Departs 14:4545 flights17.8%
- Departs 15:4537 flights14.6%
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 14:05 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 4779 runs 18 points worse at 54.4%. 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 4779 next to RNO to SFO
Every carrier on RNO to SFO combined arrived on time 59.3% of the time across 1,980 flights, so OO 4779 is 5 points behind it. SkyWest flew 1,037 flights on the same city pair under all its flight numbers, including this one, and those ran 60.8% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 24 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4779thin sample | 253 | 54.4% | 69 min | 1.58% | F |
| All SkyWest Airlines on RNO–SFO | 1,037 | 60.8% | 68 min | 2.12% | D |
| All carriers on RNO–SFO | 1,980 | 59.3% | 64 min | 1.36% | D |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4779 quarter by quarter
OO 4779 did not run the same all year. Its best quarter was Jan–Mar 2026 at 77.5% on time and its weakest Jul–Sep 2026 at 32.3%, a swing of 45 points on roughly 84 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.
- Oct–Dec 202513 flights—
- Jan–Mar 202690 flights77.5%
- Apr–Jun 202688 flights45.9%
- Jul–Sep 202662 flights32.3%
Scale runs 25% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4779 did best on Saturday at 77.1% on time and worst on Sunday at 44.4%. Each day rests on about 36 flights, so a gap of 33 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4779 runs when it is late
OO 4779 often beats the schedule: 64 of 248 completed flights, 26%, arrived 15 minutes or more early. The 113 late arrivals split 23 under half an hour, 53 between 30 and 60 minutes, and 37 an hour or more.
- 15+ min early64 flights25.8%
- Within 15 min71 flights28.6%
- 15–29 min late23 flights9.3%
- 30–59 min late53 flights21.4%
- 1–2 hours late23 flights9.3%
- 2+ hours late14 flights5.6%
Scale runs 0% to 100%.
Share of 248 completed flights by arrival against schedule.
15 of 112 late departures made up the time and arrived on time, 13% of them. In the other direction, 16 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 4779
The latest arrival of the period was on 12 July 2026, 9 hours 31 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 12 July 2026 | 9 hours 31 minutes | Carrier |
| 21 May 2026 | 8 hours 1 minute | Late-arriving aircraft |
| 8 February 2026 | 5 hours 38 minutes | Carrier |
| 2 July 2026 | 4 hours 4 minutes | National Airspace System |
| 5 July 2026 | 3 hours 34 minutes | Carrier |
Delay causes
Why OO 4779 runs late
National Airspace System accounts for 55% of the 7,813 delay minutes carriers reported here, and the remaining four split what is left.
- 55%National Airspace System
- 24%Carrier
- 18%Late-arriving aircraft
- 3%Extreme weather
55% 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 4,332 minutes out of 7,813, against a national NAS share of 21%. The split is drawn from 7,813 delay minutes reported on OO 4779.
Cancellations sit at 1.58% against a national 1.89%, which is ordinary. Diversions add another 0.40%.
Connections and routes
What a delay on this flight costs
14.9% 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 eight other city pairs in the data, including MLI to ORD (31), ORD to MSN (28) and MEM to IAH (15), but none flew often enough under OO 4779 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to RNO to SFO 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 4779
For a booking, OO 4779 is a flight to put a long connection behind. 14.9% 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
- RNO to SFO, every carrier and departure
- SFO to RNO, the return direction
- SkyWest Airlines 5899 on the same route53.2%
- 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.