Flight number record

OO 4687

SkyWest Airlines · Denver to Casper

Route: DEN → CPR
Departs: 11:20
Flights: 315
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4687, 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 4687 lands a B, about a point better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That is a workable record, not a spotless one. That rests on 315 flights, with a median arrival 4 minutes early.

On time

78.4%

Arrivals under 15 minutes late, of 310 completed flights

Avg delay

54 min

Across delayed arrivals only, not all flights

Cancelled

1.27%

National rate is 1.81%

1 hour+ late

4.5%

National rate is 8.1%

These figures cover 315 flights between July 2025 and June 2026. The median arrival is 4 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 4687 flies

OO 4687 flies DEN to CPR without a single fixed slot. Its most common scheduled departure was 11:20, used on 74 of 315 flights, with 11:30 (74 flights) and 11:28 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:2074 flights23.5%
Departs 11:3074 flights23.5%
Departs 11:2841 flights13.0%

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 11:20 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 4687 runs level with that at 78.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 4687 next to DEN to CPR

Every carrier on DEN to CPR combined arrived on time 77.4% of the time across 2,570 flights, so OO 4687 is about level with it. Across its whole network SkyWest Airlines managed 79.0%, close to this flight's figure.

OO 4687 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4687thin sample	315	78.4%	54 min	1.27%	B
All SkyWest Airlines on DEN–CPR	2,570	77.4%	79 min	1.01%	B
All carriers on DEN–CPR	2,570	77.4%	79 min	1.01%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4687 quarter by quarter

Quarter by quarter OO 4687 held fairly steady: 81.4% in Jul–Sep 2025, 82.4% in Oct–Dec 2025, 77.0% in Jan–Mar 2026 and 74.2% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202543 flights81.4%
Oct–Dec 202592 flights82.4%
Jan–Mar 202689 flights77.0%
Apr–Jun 202691 flights74.2%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4687 did best on Friday at 87.8% on time and worst on Tuesday at 73.9%. Each day rests on about 45 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4687 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,582 reported delay minutes.

Late-arriving aircraft
40%
Carrier
40%
National Airspace System
18%
Extreme weather
3%

40% 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 3,582 reported delay minutes here, that single category outweighs weather by 16 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 3,582 delay minutes reported on OO 4687.

Cancellations sit at 1.27% against a national 1.81%, which is ordinary. Diversions add another 0.32%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 4.5% 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 same number turns up on three other city pairs in the data, including DEN to GUC (49), ASE to DEN (40) and DAY to ORD (1), but none flew often enough under OO 4687 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to CPR only.

One caution: this is a thin sample. 315 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 4687

For a booking, read OO 4687 as 78.4% on time with 1.27% cancelled over 315 flights. Those are rates from the past twelve months, not a forecast for any particular 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