Flight number record
OO 5248
SkyWest Airlines · Sacramento to San Francisco
- Route
- SMF → SFO
- Departs
- 11:10
- Flights
- 364
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 a D, which is as low as this site's scale goes for a reason. Only 57.1% of flights arrive inside the 15-minute window, 20 points worse than the national rate of 77.6%. Late arrivals average about an hour. Treat any tight connection here as a coin flip. That rests on 364 flights, with a median arrival 8 minutes late.
The national on-time rate over the same period is 77.6%, so OO 5248 runs 20 points behind the country as a whole. Across a thousand flights that is about 205 extra late arrivals.
Key figures
On time
57.1%
Arrivals under 15 minutes late, of 354 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
2.75%
National rate is 1.81%
1 hour+ late
10.7%
National rate is 8.1%
These figures cover 364 flights between July 2025 and June 2026. Beyond the headline rate, 10.7% 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 5248 flies
OO 5248 flies SMF to SFO without a single fixed slot. Its most common scheduled departure was 11:10, used on 68 of 364 flights, with 10:30 (49 flights) and 10:40 (48 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 11:1068 flights18.7%
- Departs 10:3049 flights13.5%
- Departs 10:4048 flights13.2%
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 11:10 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 5248 runs 22 points worse at 57.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
OO 5248 next to SMF to SFO
Every carrier on SMF to SFO combined arrived on time 64.6% of the time across 1,378 flights, so OO 5248 is 7 points behind it. SkyWest flew 1,325 flights on the same city pair under all its flight numbers, including this one, and those ran 63.5% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 22 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5248thin sample | 364 | 57.1% | 56 min | 2.75% | D |
| All SkyWest Airlines on SMF–SFO | 1,325 | 63.5% | 68 min | 1.81% | D |
| All carriers on SMF–SFO | 1,378 | 64.6% | 68 min | 1.74% | D |
| SkyWest Airlines, whole network | 852,935 | 79.0% | 88 min | 1.77% | B |
Across the year
OO 5248 quarter by quarter
OO 5248 did not run the same all year. Its best quarter was Jul–Sep 2025 at 68.5% on time and its weakest Oct–Dec 2025 at 45.2%, a swing of 23 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 flights68.5%
- Oct–Dec 202591 flights45.2%
- Jan–Mar 202690 flights65.9%
- Apr–Jun 202691 flights47.8%
Scale runs 35% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5248 did best on Saturday at 72.5% on time and worst on Monday at 48.0%. Each day rests on about 52 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Delay causes
Why OO 5248 runs late
One category carries most of the weight here. National Airspace System accounts for 48% of the 8,497 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 48%National Airspace System
- 24%Late-arriving aircraft
- 21%Carrier
- 7%Extreme weather
48% 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 4,074 minutes out of 8,497, against a national NAS share of 21%. The split is drawn from 8,497 delay minutes reported on OO 5248.
Cancellations run at 2.75%, against 1.81% 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.7% 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 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 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 5961 on the same route43.1%
- SkyWest Airlines 5460 on the same route90.6%
- 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
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.