Flight number record
OO 5961
SkyWest Airlines · Sacramento to San Francisco
- Route
- SMF → SFO
- Departs
- 20:30
- Flights
- 332
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5961, 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 5961 earns an F−, which is as low as this site's scale goes for a reason. Only 43.2% of flights arrive inside the 15-minute window, 34 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 332 flights, with a median arrival 20 minutes late.
The national on-time rate over the same period is 77.3%, so OO 5961 runs 34 points behind the country as a whole. Across a thousand flights that is about 341 extra late arrivals.
Key figures
On time
43.2%
Arrivals under 15 minutes late, of 322 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
3.01%
National rate is 1.89%
1 hour+ late
17.1%
National rate is 8.3%
These figures cover 332 flights between September 2025 and August 2026. Beyond the headline rate, 17.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5961 flies
OO 5961 flies SMF to SFO without a single fixed slot. Its most common scheduled departure was 20:30, used on 58 of 332 flights, with 19:03 (50 flights) and 20:35 (48 flights) next.
- Departs 20:3058 flights17.5%
- Departs 19:0350 flights15.1%
- Departs 20:3548 flights14.5%
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 20:30 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 5961 runs 27 points worse at 43.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 5961 next to SMF to SFO
Every carrier on SMF to SFO combined arrived on time 62.2% of the time across 1,360 flights, so OO 5961 is 19 points behind it. SkyWest flew 1,245 flights on the same city pair under all its flight numbers, including this one, and those ran 59.3% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 36 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5961thin sample | 332 | 43.2% | 76 min | 3.01% | F− |
| All SkyWest Airlines on SMF–SFO | 1,245 | 59.3% | 72 min | 1.85% | D |
| All carriers on SMF–SFO | 1,360 | 62.2% | 72 min | 1.69% | D |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5961 quarter by quarter
OO 5961 did not run the same all year. Its best quarter was Jan–Mar 2026 at 61.8% on time and its weakest Apr–Jun 2026 at 30.3%, a swing of 31 points on roughly 83 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 202523 flights—
- Oct–Dec 202589 flights42.7%
- Jan–Mar 202678 flights61.8%
- Apr–Jun 202690 flights30.3%
- Jul–Sep 202652 flights38.5%
Scale runs 20% to 65%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5961 did best on Tuesday at 60.0% on time and worst on Monday at 27.5%. Each day rests on about 47 flights, so a gap of 33 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5961 runs when it is late
The 183 late arrivals split 57 under half an hour, 71 between 30 and 60 minutes, and 55 an hour or more.
- 15+ min early36 flights11.2%
- Within 15 min103 flights32.0%
- 15–29 min late57 flights17.7%
- 30–59 min late71 flights22.0%
- 1–2 hours late35 flights10.9%
- 2+ hours late20 flights6.2%
Scale runs 0% to 100%.
Share of 322 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 146 departures that left 15 minutes late or more, only 13 made it up before arrival. In the other direction, 50 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 5961
The latest arrival of the period was on 2 August 2026, 15 hours 33 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 August 2026 | 15 hours 33 minutes | Carrier |
| 1 July 2026 | 15 hours 24 minutes | National Airspace System |
| 14 December 2025 | 15 hours 13 minutes | Late-arriving aircraft |
| 21 February 2026 | 12 hours 38 minutes | Late-arriving aircraft |
| 21 December 2025 | 6 hours 43 minutes | Late-arriving aircraft |
Delay causes
Why OO 5961 runs late
National Airspace System accounts for 51% of the 14,000 delay minutes carriers reported here, and the remaining four split what is left.
- 51%National Airspace System
- 29%Late-arriving aircraft
- 18%Carrier
- 2%Extreme weather
51% 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 7,034 minutes out of 14,000, against a national NAS share of 21%. The split is drawn from 13,857 delay minutes reported on OO 5961.
Cancellations run at 3.01%, against 1.89% nationally. That is roughly one flight in 30 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
17.1% 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.
Every one of the 332 flights under OO 5961 in the data flew SMF to SFO. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 332 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 5961
For a booking, the cancellation rate is the figure to plan around on OO 5961: 3.01% of its 332 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
- SMF to SFO, every carrier and departure
- SFO to SMF, the return direction
- SkyWest Airlines 5248 on the same route53.7%
- Sacramento International (SMF) delay statistics
- 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
- The best time of day to fly, according to 7.05 million flight records
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.