Flight number record
OO 5220
SkyWest Airlines · San Francisco to Sacramento
- Route
- SFO → SMF
- Departs
- 08:17
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5220, 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 5220 lands a B, 5 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 362 flights, with a median arrival 6 minutes early.
Set against the rest of the country, OO 5220's record is 5 points better than the US average of 77.3%. That gap is worth roughly 49 fewer late arrivals for every thousand flights.
Key figures
On time
82.2%
Arrivals under 15 minutes late, of 353 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
2.49%
National rate is 1.89%
1 hour+ late
5.4%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. The median arrival is 6 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When OO 5220 flies
OO 5220 flies SFO to SMF without a single fixed slot. Its most common scheduled departure was 08:17, used on 75 of 362 flights, with 08:25 (46 flights) and 09:23 (37 flights) next.
- Departs 08:1775 flights20.7%
- Departs 08:2546 flights12.7%
- Departs 09:2337 flights10.2%
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 08:17 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 5220 runs level with that at 82.2%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 5220 next to SFO to SMF
Every carrier on SFO to SMF combined arrived on time 76.0% of the time across 1,359 flights, so OO 5220 is 6 points ahead of it. SkyWest flew 1,243 flights on the same city pair under all its flight numbers, including this one, and those ran 77.0% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5220thin sample | 362 | 82.2% | 68 min | 2.49% | B |
| All SkyWest Airlines on SFO–SMF | 1,243 | 77.0% | 79 min | 1.77% | B |
| All carriers on SFO–SMF | 1,359 | 76.0% | 75 min | 1.62% | B |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5220 quarter by quarter
OO 5220 did not run the same all year. Its best quarter was Apr–Jun 2026 at 92.3% on time and its weakest Jan–Mar 2026 at 67.8%, a swing of 25 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 flights80.0%
- Oct–Dec 202590 flights83.1%
- Jan–Mar 202689 flights67.8%
- Apr–Jun 202691 flights92.3%
- Jul–Sep 202662 flights87.1%
Scale runs 60% to 100%.
By weekday, OO 5220 did best on Wednesday at 88.2% on time and worst on Thursday at 70.8%. Each day rests on about 52 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5220 runs when it is late
The 63 late arrivals split 24 under half an hour, 20 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early86 flights24.4%
- Within 15 min204 flights57.8%
- 15–29 min late24 flights6.8%
- 30–59 min late20 flights5.7%
- 1–2 hours late9 flights2.5%
- 2+ hours late10 flights2.8%
Scale runs 0% to 100%.
Share of 353 completed flights by arrival against schedule.
10 of 62 late departures made up the time and arrived on time, 16% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for OO 5220
The latest arrival of the period was on 29 May 2026, 9 hours 33 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 May 2026 | 9 hours 33 minutes | Extreme weather |
| 4 February 2026 | 3 hours 36 minutes | Late-arriving aircraft |
| 9 September 2025 | 3 hours 22 minutes | Late-arriving aircraft |
| 31 January 2026 | 3 hours 19 minutes | Late-arriving aircraft |
| 16 January 2026 | 3 hours 7 minutes | Extreme weather |
Delay causes
Why OO 5220 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 4,264 reported delay minutes.
- 34%Late-arriving aircraft
- 29%Carrier
- 28%Extreme weather
- 10%National Airspace System
Extreme weather accounts for 28% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 4.7 times the usual weather exposure. The split is drawn from 4,264 delay minutes reported on OO 5220.
Cancellations sit at 2.49% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
5.4% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The same number turns up on one other city pair in the data, including SMF to LAX (47), but none flew often enough under OO 5220 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to SMF 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 5220
For a booking, read OO 5220 as 82.2% on time with 2.49% cancelled over 362 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SFO to SMF, every carrier and departure
- SMF to SFO, the return direction
- SkyWest Airlines 5796 on the same route75.4%
- San Francisco International (SFO) delay statistics
- Sacramento International (SMF) 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
- Why the first flight of the morning is statistically safest
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.