Flight number record

OO 4043

SkyWest Airlines · Seattle to Sacramento

Route: SEA → SMF
Departs: 17:00
Flights: 316
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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 12 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 45 minutes. That rests on 316 flights, with a median arrival 7 minutes early.

Set against the rest of the country, OO 4043's record is 12 points better than the US average of 77.3%. That gap is worth roughly 116 fewer late arrivals for every thousand flights.

On time

88.9%

Arrivals under 15 minutes late, of 314 completed flights

Avg delay

46 min

Across delayed arrivals only, not all flights

Cancelled

0.32%

National rate is 1.89%

1 hour+ late

3.5%

National rate is 8.3%

These figures cover 316 flights between September 2025 and August 2026. The median arrival is 7 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 4043 flies

OO 4043 flies SEA to SMF without a single fixed slot. Its most common scheduled departure was 17:00, used on 86 of 316 flights, with 15:30 (45 flights) next.

Departs 17:0086 flights27.2%
Departs 15:3045 flights14.2%

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 17:00 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 4043 runs 21 points better at 88.9%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

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Against the route

OO 4043 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 4043 is 7 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 10 points.

OO 4043 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4043thin sample	316	88.9%	46 min	0.32%	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 4043 quarter by quarter

OO 4043 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jul–Sep 2026 at 77.4%, a swing of 19 points on roughly 63 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 flights96.7%
Oct–Dec 202563 flights95.2%
Jan–Mar 202675 flights87.7%
Apr–Jun 202686 flights90.7%
Jul–Sep 202662 flights77.4%

Scale runs 70% to 100%.

By weekday, OO 4043 ranged from 83.0% on Friday to 91.7% on Monday. With about 45 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late OO 4043 runs when it is late

OO 4043 often beats the schedule: 80 of 314 completed flights, 25%, arrived 15 minutes or more early. The 35 late arrivals split 17 under half an hour, 7 between 30 and 60 minutes, and 11 an hour or more.

15+ min early80 flights25.5%
Within 15 min199 flights63.4%
15–29 min late17 flights5.4%
30–59 min late7 flights2.2%
1–2 hours late10 flights3.2%
2+ hours late1 flights0.3%

Scale runs 0% to 100%.

Share of 314 completed flights by arrival against schedule.

8 of 37 late departures made up the time and arrived on time, 22% of them. Only 6 left on time and still arrived late.

The worst days

Worst days for OO 4043

The latest arrival of the period was on 18 February 2026, 2 hours 38 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).

The latest arrivals of OO 4043 in the period
Date	Arrived late by	Largest filed cause
18 February 2026	2 hours 38 minutes	Extreme weather
2 August 2026	1 hour 41 minutes	Carrier
17 February 2026	1 hour 40 minutes	National Airspace System
2 October 2025	1 hour 32 minutes	Carrier
24 March 2026	1 hour 30 minutes	Carrier

Delay causes

Why OO 4043 runs late

Carrier accounts for 57% of the 1,622 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
57%
Extreme weather
31%
National Airspace System
12%

Extreme weather accounts for 31% 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 1,622 delay minutes reported on OO 4043.

Cancellations are rare at 0.32%, below the national 1.89% 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 3.5% 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 (157), 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. 316 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: 88.9% on time and 0.32% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures