Flight number record
OO 5587
SkyWest Airlines · Monterey to Denver
- Route
- MRY → DEN
- Departs
- 05:00
- Flights
- 261
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5587, 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 5587 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 20 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 2.1 hours. That rests on 261 flights, with a median arrival 19 minutes early.
Set against the rest of the country, OO 5587's record is 20 points better than the US average of 77.3%. That gap is worth roughly 196 fewer late arrivals for every thousand flights.
Key figures
On time
96.9%
Arrivals under 15 minutes late, of 260 completed flights
Avg delay
129 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
1.9%
National rate is 8.3%
These figures cover 261 flights between September 2025 and August 2026. The median arrival is 19 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 5587 flies
OO 5587 flies MRY to DEN without a single fixed slot. Its most common scheduled departure was 05:00, used on 171 of 261 flights, with 05:05 (35 flights) and 05:10 (31 flights) next.
- Departs 05:00171 flights65.5%
- Departs 05:0535 flights13.4%
- Departs 05:1031 flights11.9%
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 05:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 5587 runs 8 points better at 96.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 5587 next to MRY to DEN
Every carrier on MRY to DEN combined arrived on time 92.9% of the time across 729 flights, so OO 5587 is 4 points ahead of it. SkyWest flew 626 flights on the same city pair under all its flight numbers, including this one, and those ran 92.9% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 18 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5587thin sample | 261 | 96.9% | 129 min | 0.00% | A+ |
| All SkyWest Airlines on MRY–DEN | 626 | 92.9% | 85 min | 0.16% | A+ |
| All carriers on MRY–DEN | 729 | 92.9% | 90 min | 0.27% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5587 quarter by quarter
Quarter by quarter OO 5587 held fairly steady: 96.7% in Jul–Sep 2025, 96.7% in Oct–Dec 2025, 96.6% in Jan–Mar 2026 and 98.0% in Apr–Jun 2026. A spread of about a point is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights96.7%
- Oct–Dec 202592 flights96.7%
- Jan–Mar 202689 flights96.6%
- Apr–Jun 202650 flights98.0%
Scale runs 90% to 100%.
By weekday, OO 5587 ranged from 91.9% on Saturday to 100.0% on Thursday. With about 37 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.
Arrival by arrival
How late OO 5587 runs when it is late
OO 5587 often beats the schedule: 162 of 260 completed flights, 62%, arrived 15 minutes or more early. When OO 5587 is late it tends to be very late: 5 of its 8 late arrivals were an hour or more behind, and 3 were two hours or more.
- 15+ min early162 flights62.3%
- Within 15 min90 flights34.6%
- 15–29 min late1 flights0.4%
- 30–59 min late2 flights0.8%
- 1–2 hours late2 flights0.8%
- 2+ hours late3 flights1.2%
Scale runs 0% to 100%.
Share of 260 completed flights by arrival against schedule.
Only 11 of 260 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for OO 5587
The latest arrival of the period was on 24 December 2025, 4 hours 54 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 24 December 2025 | 4 hours 54 minutes | Late-arriving aircraft |
| 28 February 2026 | 4 hours 2 minutes | Carrier |
| 12 September 2025 | 3 hours 7 minutes | National Airspace System |
| 23 March 2026 | 1 hour 51 minutes | Carrier |
| 1 November 2025 | 1 hour 28 minutes | Carrier |
Delay causes
Why OO 5587 runs late
Carrier accounts for 44% of the 1,031 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Carrier
- 29%Late-arriving aircraft
- 22%National Airspace System
- 6%Extreme weather
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 451 of the 1,031 delay minutes reported here. The split is drawn from 1,031 delay minutes reported on OO 5587.
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
Badly late arrivals are rare here: only 1.9% 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 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.
The same number turns up on four other city pairs in the data, including OMA to ORD (67), ORD to GRB (21) and ORD to MSN (6), but none flew often enough under OO 5587 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MRY to DEN only.
One caution: this is a thin sample. 261 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 5587
For a booking, OO 5587 has one of the better records a US domestic flight can show: 96.9% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- MRY to DEN, every carrier and departure
- DEN to MRY, the return direction
- SkyWest Airlines 4713 on the same route90.0%
- 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
- The best day of the week to fly, and why it is the second lever
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.