Flight number record

OO 5438

SkyWest Airlines · Denver to Monterey

Route: DEN → MRY
Departs: 11:15
Flights: 363
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5438, 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 5438 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 77.6%. When something does go wrong the average delay runs about an hour. That rests on 363 flights, with a median arrival 7 minutes early.

Set against the rest of the country, OO 5438's record is 9 points better than the US average of 77.6%. That gap is worth roughly 89 fewer late arrivals for every thousand flights.

On time

86.5%

Arrivals under 15 minutes late, of 363 completed flights

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

4.4%

National rate is 8.1%

These figures cover 363 flights between July 2025 and June 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.

Schedule

When OO 5438 flies

OO 5438 flies DEN to MRY without a single fixed slot. Its most common scheduled departure was 11:15, used on 111 of 363 flights, with 11:20 (52 flights) and 11:33 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:15111 flights30.6%
Departs 11:2052 flights14.3%
Departs 11:3349 flights13.5%

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 11:15 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 5438 runs 8 points better at 86.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 5438 next to DEN to MRY

Every carrier on DEN to MRY combined arrived on time 80.6% of the time across 727 flights, so OO 5438 is 6 points ahead of it. SkyWest flew 685 flights on the same city pair under all its flight numbers, including this one, and those ran 82.4% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 8 points.

OO 5438 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5438thin sample	363	86.5%	59 min	0.00%	A+
All SkyWest Airlines on DEN–MRY	685	82.4%	61 min	0.29%	B+
All carriers on DEN–MRY	727	80.6%	59 min	0.41%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5438 quarter by quarter

OO 5438 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.2% on time and its weakest Oct–Dec 2025 at 78.3%, a swing of 12 points on roughly 91 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 202592 flights90.2%
Oct–Dec 202592 flights78.3%
Jan–Mar 202688 flights88.6%
Apr–Jun 202691 flights89.0%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5438 ranged from 82.7% on Friday to 90.6% on Tuesday. With about 52 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 5438 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 43% of the 2,903 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.

Late-arriving aircraft
43%
Carrier
40%
National Airspace System
12%
Extreme weather
4%

43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 2,903 reported delay minutes here, that single category outweighs weather by 10 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 2,903 delay minutes reported on OO 5438.

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 4.4% 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 959 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.

Every one of the 363 flights under OO 5438 in the data flew DEN to MRY. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 363 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 5438

For a booking, OO 5438 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.

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