Flight number record

OO 4043

SkyWest Airlines · Seattle to Sacramento

Route: SEA → SMF
Departs: 16:20
Flights: 306
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4043, 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 4043 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 11 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 306 flights, with a median arrival 8 minutes early.

Set against the rest of the country, OO 4043's record is 11 points better than the US average of 77.6%. That gap is worth roughly 109 fewer late arrivals for every thousand flights.

On time

88.5%

Arrivals under 15 minutes late, of 304 completed flights

Avg delay

58 min

Across delayed arrivals only, not all flights

Cancelled

0.33%

National rate is 1.81%

1 hour+ late

4.3%

National rate is 8.1%

These figures cover 306 flights between July 2025 and June 2026. The median arrival is 8 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 4043 flies

OO 4043 flies SEA to SMF without a single fixed slot. Its most common scheduled departure was 16:20, used on 48 of 306 flights, with 15:30 (45 flights) and 17:38 (31 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 16:2048 flights15.7%
Departs 15:3045 flights14.7%
Departs 17:3831 flights10.1%

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 16:20 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and OO 4043 runs 16 points better at 88.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 4043 next to SEA to SMF

Every carrier on SEA to SMF combined arrived on time 81.9% of the time across 4,407 flights, so OO 4043 is 7 points ahead of it. SkyWest flew 1,941 flights on the same city pair under all its flight numbers, including this one, and those ran 89.3% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 10 points.

OO 4043 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4043thin sample	306	88.5%	58 min	0.33%	A+
All SkyWest Airlines on SEA–SMF	1,941	89.3%	62 min	0.26%	A+
All carriers on SEA–SMF	4,407	81.9%	50 min	0.41%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4043 quarter by quarter

OO 4043 did not run the same all year. Its best quarter was Oct–Dec 2025 at 95.2% on time and its weakest Jul–Sep 2025 at 81.7%, a swing of 14 points on roughly 77 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 202582 flights81.7%
Oct–Dec 202563 flights95.2%
Jan–Mar 202675 flights87.7%
Apr–Jun 202686 flights90.7%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4043 did best on Thursday at 95.7% on time and worst on Sunday at 82.6%. Each day rests on about 44 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4043 runs late

One category carries most of the weight here. Carrier accounts for 58% of the 2,019 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
58%
Extreme weather
32%
National Airspace System
10%

Extreme weather accounts for 32% 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 5.1 times the usual weather exposure. The split is drawn from 2,019 delay minutes reported on OO 4043.

Cancellations are rare at 0.33%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is 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 4.3% 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 three other city pairs in the data, including SMF to SEA (138), LGA to BNA (6) and BNA to LGA (1), but none flew often enough under OO 4043 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. 306 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 4043

For a booking, OO 4043 has one of the better records a US domestic flight can show: 88.5% on time and 0.33% 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