Flight number record
OO 4125
SkyWest Airlines · Seattle to Sacramento
- Route
- SEA → SMF
- Departs
- 12:20
- Flights
- 349
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4125, 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 4125 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 349 flights, with a median arrival 10 minutes early.
Set against the rest of the country, OO 4125's record is 13 points better than the US average of 77.3%. That gap is worth roughly 132 fewer late arrivals for every thousand flights.
Key figures
On time
90.5%
Arrivals under 15 minutes late, of 349 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
3.7%
National rate is 8.3%
These figures cover 349 flights between September 2025 and August 2026. The median arrival is 10 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 4125 flies
OO 4125 flies SEA to SMF without a single fixed slot. Its most common scheduled departure was 12:20, used on 61 of 349 flights, with 10:10 (53 flights) and 10:30 (52 flights) next.
- Departs 12:2061 flights17.5%
- Departs 10:1053 flights15.2%
- Departs 10:3052 flights14.9%
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 12:20 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 4125 runs 12 points better at 90.5%. 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 4125 next to SEA to SMF
Every carrier on SEA to SMF combined arrived on time 82.1% of the time across 4,387 flights, so OO 4125 is 8 points ahead of it. SkyWest flew 1,839 flights on the same city pair under all its flight numbers, including this one, and those ran 89.1% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4125thin sample | 349 | 90.5% | 59 min | 0.00% | A+ |
| All SkyWest Airlines on SEA–SMF | 1,839 | 89.1% | 63 min | 0.27% | A+ |
| All carriers on SEA–SMF | 4,387 | 82.1% | 51 min | 0.39% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4125 quarter by quarter
Quarter by quarter OO 4125 held fairly steady: 93.3% in Jul–Sep 2025, 91.2% in Oct–Dec 2025, 86.0% in Jan–Mar 2026, 93.4% in Apr–Jun 2026 and 90.3% in Jul–Sep 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights93.3%
- Oct–Dec 202580 flights91.2%
- Jan–Mar 202686 flights86.0%
- Apr–Jun 202691 flights93.4%
- Jul–Sep 202662 flights90.3%
Scale runs 80% to 100%.
By weekday, OO 4125 did best on Tuesday at 96.0% on time and worst on Thursday at 84.0%. Each day rests on about 50 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4125 runs when it is late
OO 4125 often beats the schedule: 115 of 349 completed flights, 33%, arrived 15 minutes or more early. The 33 late arrivals split 15 under half an hour, 5 between 30 and 60 minutes, and 13 an hour or more.
- 15+ min early115 flights33.0%
- Within 15 min201 flights57.6%
- 15–29 min late15 flights4.3%
- 30–59 min late5 flights1.4%
- 1–2 hours late10 flights2.9%
- 2+ hours late3 flights0.9%
Scale runs 0% to 100%.
Share of 349 completed flights by arrival against schedule.
7 of 38 late departures made up the time and arrived on time, 18% of them. Only 2 left on time and still arrived late.
The worst days
Worst days for OO 4125
The latest arrival of the period was on 13 March 2026, 5 hours 16 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 carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 March 2026 | 5 hours 16 minutes | Extreme weather |
| 20 October 2025 | 2 hours 24 minutes | Carrier |
| 15 January 2026 | 2 hours 20 minutes | Extreme weather |
| 21 April 2026 | 1 hour 54 minutes | Carrier |
| 5 October 2025 | 1 hour 49 minutes | Carrier |
Delay causes
Why OO 4125 runs late
Carrier accounts for 66% of the 1,950 delay minutes carriers reported here, and the remaining four split what is left.
- 66%Carrier
- 30%Extreme weather
- 4%National Airspace System
Extreme weather accounts for 30% 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 5.0 times the usual weather exposure. The split is drawn from 1,950 delay minutes reported on OO 4125.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.7% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 605 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on one other city pair in the data, including SMF to SEA (177), but none flew often enough under OO 4125 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to SMF only.
One caution: this is a thin sample. 349 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 4125
For a booking, OO 4125 has one of the better records a US domestic flight can show: 90.5% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SEA to SMF, every carrier and departure
- SMF to SEA, the return direction
- SkyWest Airlines 3881 on the same route91.3%
- SkyWest Airlines 4131 on the same route88.4%
- SkyWest Airlines 4043 on the same route88.9%
- Alaska Airlines 681 on the same route81.9%
- Seattle-Tacoma International (SEA) 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
- Worst months to fly in the US, ranked by the data
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.