Flight number record

OO 4075

SkyWest Airlines · Sacramento to Seattle

Route: SMF → SEA
Departs: 06:30
Flights: 349
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 12 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 45 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 12 points better than the US average of 77.6%. That gap is worth roughly 124 fewer late arrivals for every thousand flights.

On time

90.0%

Arrivals under 15 minutes late, of 349 completed flights

Avg delay

43 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

2.3%

National rate is 8.1%

These figures cover 349 flights between July 2025 and June 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.

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 146 of 349 flights, with 07:35 (67 flights) and 06:47 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:30146 flights41.8%
Departs 07:3567 flights19.2%
Departs 06:4735 flights10.0%

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 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 level with that at 90.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

OO 4075 next to SMF to SEA

Every carrier on SMF to SEA combined arrived on time 82.7% of the time across 4,416 flights, so OO 4075 is 7 points ahead of it. SkyWest flew 1,952 flights on the same city pair under all its flight numbers, including this one, and those ran 87.4% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 11 points.

OO 4075 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4075thin sample	349	90.0%	43 min	0.00%	A+
All SkyWest Airlines on SMF–SEA	1,952	87.4%	57 min	0.26%	A+
All carriers on SMF–SEA	4,416	82.7%	47 min	0.34%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4075 quarter by quarter

Quarter by quarter OO 4075 held fairly steady: 92.4% in Jul–Sep 2025, 93.8% in Oct–Dec 2025, 86.0% in Jan–Mar 2026 and 87.9% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights92.4%
Oct–Dec 202580 flights93.8%
Jan–Mar 202686 flights86.0%
Apr–Jun 202691 flights87.9%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4075 did best on Wednesday at 94.0% on time and worst on Tuesday at 78.4%. Each day rests on about 50 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4075 runs late

One category carries most of the weight here. Carrier accounts for 76% of the 1,491 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.

Carrier
76%
National Airspace System
10%
Security
8%
Extreme weather
6%

The largest share of delay minutes, 76%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,139 of the 1,491 delay minutes reported here. The split is drawn from 1,491 delay minutes reported on OO 4075.

Cancellations are rare at 0.00%, below the national 1.81% 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 2.3% land an hour or more behind schedule, against 8.1% 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

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: 90.0% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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.

Key figures