Flight number record

OO 5818

SkyWest Airlines · Casper to Denver

Route: CPR → DEN
Departs: 07:00
Flights: 362
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5818, 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 5818 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 an hour and a half. That rests on 362 flights, with a median arrival 18 minutes early.

Set against the rest of the country, OO 5818's record is 9 points better than the US average of 77.6%. That gap is worth roughly 93 fewer late arrivals for every thousand flights.

On time

86.9%

Arrivals under 15 minutes late, of 360 completed flights

Avg delay

85 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.81%

1 hour+ late

5.3%

National rate is 8.1%

These figures cover 362 flights between July 2025 and June 2026. The median arrival is 18 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 5818 flies

OO 5818 flies CPR to DEN without a single fixed slot. Its most common scheduled departure was 07:00, used on 162 of 362 flights, with 07:05 (109 flights) and 07:10 (91 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:00162 flights44.8%
Departs 07:05109 flights30.1%
Departs 07:1091 flights25.1%

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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 5818 runs 2 points worse at 86.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

OO 5818 next to CPR to DEN

Every carrier on CPR to DEN combined arrived on time 81.9% of the time across 2,570 flights, so OO 5818 is 5 points ahead of it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 8 points.

OO 5818 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5818thin sample	362	86.9%	85 min	0.55%	A+
All SkyWest Airlines on CPR–DEN	2,570	81.9%	88 min	0.93%	B+
All carriers on CPR–DEN	2,570	81.9%	88 min	0.93%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5818 quarter by quarter

OO 5818 did not run the same all year. Its best quarter was Jan–Mar 2026 at 94.4% on time and its weakest Jul–Sep 2025 at 73.3%, a swing of 21 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 202591 flights73.3%
Oct–Dec 202592 flights87.9%
Jan–Mar 202689 flights94.4%
Apr–Jun 202690 flights92.2%

Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5818 did best on Tuesday at 94.3% on time and worst on Saturday at 80.4%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5818 runs late

One category carries most of the weight here. Carrier accounts for 71% of the 3,992 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.

Carrier
71%
Late-arriving aircraft
19%
National Airspace System
6%
Extreme weather
5%

The largest share of delay minutes, 71%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,822 of the 3,992 delay minutes reported here. The split is drawn from 3,992 delay minutes reported on OO 5818.

Cancellations are rare at 0.55%, below the national 1.81% 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

5.3% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.

Every one of the 362 flights under OO 5818 in the data flew CPR to DEN. 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 5818

For a booking, OO 5818 has one of the better records a US domestic flight can show: 86.9% on time and 0.55% 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