Flight number record
OO 5438
SkyWest Airlines · Denver to Monterey
- Route
- DEN → MRY
- Departs
- 11:15
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 362 flights, with a median arrival 8 minutes early.
Set against the rest of the country, OO 5438's record is 8 points better than the US average of 77.3%. That gap is worth roughly 80 fewer late arrivals for every thousand flights.
Key figures
On time
85.3%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
5.0%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 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.
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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 172 of 362 flights, with 11:20 (52 flights) and 11:31 (37 flights) next.
- Departs 11:15172 flights47.5%
- Departs 11:2052 flights14.4%
- Departs 11:3137 flights10.2%
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 11:15 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 5438 runs 7 points better at 85.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
OO 5438 next to DEN to MRY
Every carrier on DEN to MRY combined arrived on time 79.5% of the time across 726 flights, so OO 5438 is 6 points ahead of it. SkyWest flew 622 flights on the same city pair under all its flight numbers, including this one, and those ran 84.5% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5438thin sample | 362 | 85.3% | 61 min | 0.00% | A+ |
| All SkyWest Airlines on DEN–MRY | 622 | 84.5% | 56 min | 0.00% | B+ |
| All carriers on DEN–MRY | 726 | 79.5% | 63 min | 0.14% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | 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 93.3% on time and its weakest Oct–Dec 2025 at 78.3%, a swing of 15 points on roughly 72 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 flights93.3%
- Oct–Dec 202592 flights78.3%
- Jan–Mar 202688 flights88.6%
- Apr–Jun 202691 flights89.0%
- Jul–Sep 202661 flights81.7%
Scale runs 70% to 100%.
By weekday, OO 5438 ranged from 80.4% on Sunday to 90.2% on Wednesday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 5438 runs when it is late
OO 5438 often beats the schedule: 126 of 361 completed flights, 35%, arrived 15 minutes or more early. The 53 late arrivals split 16 under half an hour, 19 between 30 and 60 minutes, and 18 an hour or more.
- 15+ min early126 flights34.9%
- Within 15 min182 flights50.4%
- 15–29 min late16 flights4.4%
- 30–59 min late19 flights5.3%
- 1–2 hours late12 flights3.3%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
8 of 43 late departures made up the time and arrived on time, 19% of them. 18 flights left on time and still arrived late.
The worst days
Worst days for OO 5438
The latest arrival of the period was on 19 March 2026, 4 hours 34 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 March 2026 | 4 hours 34 minutes | Late-arriving aircraft |
| 23 December 2025 | 3 hours 25 minutes | Carrier |
| 27 December 2025 | 3 hours 19 minutes | Late-arriving aircraft |
| 24 January 2026 | 2 hours 39 minutes | Late-arriving aircraft |
| 28 July 2026 | 2 hours 33 minutes | Carrier |
Delay causes
Why OO 5438 runs late
Carrier accounts for 47% of the 3,234 delay minutes carriers reported here, and the remaining four split what is left.
- 47%Carrier
- 41%Late-arriving aircraft
- 11%National Airspace System
- 1%Extreme weather
41% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,234 reported delay minutes here, that single category outweighs weather by 41 to one. The split is drawn from 3,234 delay minutes reported on OO 5438.
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
5.0% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
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.
Every one of the 362 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. 362 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: 85.3% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DEN to MRY, every carrier and departure
- MRY to DEN, the return direction
- SkyWest Airlines 5413 on the same route83.3%
- Denver International (DEN) 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
- Why the first flight of the morning is statistically safest
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.