Flight number record
OO 5248
SkyWest Airlines · Sacramento to San Francisco
- Route
- SMF → SFO
- Departs
- 11:46
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5248, 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 5248 earns an F, which is as low as this site's scale goes for a reason. Only 53.7% of flights arrive inside the 15-minute window, 24 points worse than the national rate of 77.3%. Late arrivals average about 50 minutes. Treat any tight connection here as a coin flip. That rests on 364 flights, with a median arrival 12 minutes late.
The national on-time rate over the same period is 77.3%, so OO 5248 runs 24 points behind the country as a whole. Across a thousand flights that is about 236 extra late arrivals.
Key figures
On time
53.7%
Arrivals under 15 minutes late, of 354 completed flights
Avg delay
50 min
Across delayed arrivals only, not all flights
Cancelled
2.75%
National rate is 1.89%
1 hour+ late
9.9%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. Beyond the headline rate, 9.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5248 flies
OO 5248 flies SMF to SFO without a single fixed slot. Its most common scheduled departure was 11:46, used on 82 of 364 flights, with 11:10 (68 flights) and 10:40 (48 flights) next.
- Departs 11:4682 flights22.5%
- Departs 11:1068 flights18.7%
- Departs 10:4048 flights13.2%
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 11:46 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5248 runs 25 points worse at 53.7%. 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 5248 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 5248 is 9 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 25 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5248thin sample | 364 | 53.7% | 50 min | 2.75% | 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 5248 quarter by quarter
OO 5248 did not run the same all year. Its best quarter was Jan–Mar 2026 at 65.9% on time and its weakest Oct–Dec 2025 at 45.2%, a swing of 21 points on roughly 73 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 flights50.0%
- Oct–Dec 202591 flights45.2%
- Jan–Mar 202690 flights65.9%
- Apr–Jun 202691 flights47.8%
- Jul–Sep 202662 flights58.1%
Scale runs 35% to 70%.
By weekday, OO 5248 did best on Saturday at 68.6% on time and worst on Friday at 44.0%. Each day rests on about 52 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5248 runs when it is late
The 164 late arrivals split 65 under half an hour, 64 between 30 and 60 minutes, and 35 an hour or more.
- 15+ min early36 flights10.2%
- Within 15 min154 flights43.5%
- 15–29 min late65 flights18.4%
- 30–59 min late64 flights18.1%
- 1–2 hours late24 flights6.8%
- 2+ hours late11 flights3.1%
Scale runs 0% to 100%.
Share of 354 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 118 departures that left 15 minutes late or more, only 12 made it up before arrival. In the other direction, 58 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 5248
The latest arrival of the period was on 30 April 2026, 5 hours 43 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across April, May, September and February, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 April 2026 | 5 hours 43 minutes | Carrier |
| 20 April 2026 | 3 hours 42 minutes | National Airspace System |
| 13 May 2026 | 3 hours 11 minutes | National Airspace System |
| 9 September 2025 | 2 hours 59 minutes | Late-arriving aircraft |
| 4 February 2026 | 2 hours 51 minutes | Late-arriving aircraft |
Delay causes
Why OO 5248 runs late
National Airspace System accounts for 54% of the 8,212 delay minutes carriers reported here, and the remaining four split what is left.
- 54%National Airspace System
- 21%Carrier
- 19%Late-arriving aircraft
- 6%Extreme weather
54% 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 4,432 minutes out of 8,212, against a national NAS share of 21%. The split is drawn from 8,212 delay minutes reported on OO 5248.
Cancellations run at 2.75%, against 1.89% nationally. That is roughly one flight in 40 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
9.9% 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 one other city pair in the data, including ORD to ASE (1), but none flew often enough under OO 5248 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SMF to SFO only.
One caution: this is a thin sample. 364 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 5248
For a booking, the cancellation rate is the figure to plan around on OO 5248: 2.75% of its 364 scheduled flights did not operate. A late arrival costs about 50 minutes, 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 5961 on the same route43.2%
- 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.