Flight number record
OO 4075
SkyWest Airlines · Sacramento to Seattle
- Route
- SMF → SEA
- Departs
- 06:30
- Flights
- 349
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4075, 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 4075 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 50 minutes. That rests on 349 flights, with a median arrival 16 minutes early.
Set against the rest of the country, OO 4075's record is 9 points better than the US average of 77.3%. That gap is worth roughly 92 fewer late arrivals for every thousand flights.
Key figures
On time
86.5%
Arrivals under 15 minutes late, of 349 completed flights
Avg delay
51 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 16 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 4075 flies
OO 4075 flies SMF to SEA without a single fixed slot. Its most common scheduled departure was 06:30, used on 125 of 349 flights, with 07:35 (67 flights) next.
- Departs 06:30125 flights35.8%
- Departs 07:3567 flights19.2%
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 06:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 4075 runs 3 points worse at 86.5%. 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 4075 next to SMF to SEA
Every carrier on SMF to SEA combined arrived on time 83.0% of the time across 4,396 flights, so OO 4075 is 4 points ahead of it. SkyWest flew 1,851 flights on the same city pair under all its flight numbers, including this one, and those ran 87.6% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4075thin sample | 349 | 86.5% | 51 min | 0.00% | A+ |
| All SkyWest Airlines on SMF–SEA | 1,851 | 87.6% | 58 min | 0.27% | A+ |
| All carriers on SMF–SEA | 4,396 | 83.0% | 47 min | 0.30% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4075 quarter by quarter
OO 4075 did not run the same all year. Its best quarter was Oct–Dec 2025 at 93.8% on time and its weakest Jul–Sep 2026 at 75.8%, a swing of 18 points on roughly 70 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 flights86.7%
- Oct–Dec 202580 flights93.8%
- Jan–Mar 202686 flights86.0%
- Apr–Jun 202691 flights87.9%
- Jul–Sep 202662 flights75.8%
Scale runs 65% to 100%.
By weekday, OO 4075 did best on Wednesday at 92.0% on time and worst on Tuesday at 78.0%. Each day rests on about 50 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4075 runs when it is late
OO 4075 often beats the schedule: 181 of 349 completed flights, 52%, arrived 15 minutes or more early. The 47 late arrivals split 23 under half an hour, 11 between 30 and 60 minutes, and 13 an hour or more.
- 15+ min early181 flights51.9%
- Within 15 min121 flights34.7%
- 15–29 min late23 flights6.6%
- 30–59 min late11 flights3.2%
- 1–2 hours late9 flights2.6%
- 2+ hours late4 flights1.1%
Scale runs 0% to 100%.
Share of 349 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 26 departures that left 15 minutes late or more, only 3 made it up before arrival. In the other direction, 24 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 SEA.
The worst days
Worst days for OO 4075
The latest arrival of the period was on 25 July 2026, 4 hours 21 minutes behind schedule; most of its delay minutes were filed as extreme weather. On four of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 25 July 2026 | 4 hours 21 minutes | Extreme weather |
| 3 August 2026 | 2 hours 34 minutes | Carrier |
| 4 December 2025 | 2 hours 22 minutes | Carrier |
| 17 January 2026 | 2 hours 11 minutes | Carrier |
| 21 April 2026 | 1 hour 52 minutes | Carrier |
Delay causes
Why OO 4075 runs late
Carrier accounts for 66% of the 2,372 delay minutes carriers reported here, and the remaining four split what is left.
- 66%Carrier
- 21%Extreme weather
- 13%National Airspace System
Extreme weather accounts for 21% 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 3.4 times the usual weather exposure. The split is drawn from 2,372 delay minutes reported on OO 4075.
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 DTW to ALB (1), but none flew often enough under OO 4075 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SMF to SEA 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 4075
For a booking, OO 4075 has one of the better records a US domestic flight can show: 86.5% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SMF to SEA, every carrier and departure
- SEA to SMF, the return direction
- Sacramento International (SMF) delay statistics
- Seattle-Tacoma International (SEA) 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.