Route reliability record
CPR→DEN
Casper to Denver
- Flights
- 2,629
- Period
- September 2025 to August 2026
- Distance
- 230 mi
- Carriers
- 1
This route lands a B+, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 2,629 CPR to DEN flights, with a median arrival 12 minutes early.
Best time to fly CPR to DEN: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 89.8% of the time and Tuesday flights 86.0%, against 83.1% for the route overall.
Set against the rest of the country, this route's record is 6 points better than the US average of 77.3%. That gap is worth roughly 58 fewer late arrivals for every thousand flights.
Key figures
On time
83.1%
Arrivals under 15 minutes late, of 2,596 completed flights
Avg delay
91 min
Across delayed arrivals only, not all flights
Cancelled
0.95%
National rate is 1.89%
Best carrier
SkyWest
83.1% on time across 2,629 flights
These figures cover 2,629 flights between September 2025 and August 2026. The median arrival is 12 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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Carrier by carrier
Which airline is most reliable on CPR to DEN
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 2,629 | 83.1% | 91 min | 0.95% | B+ |
Flight by flight
Flights on CPR to DEN
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 16 points, against half a point between the best and worst carrier.
- 5am–8am708 flights89.8%
- 8am–11am467 flights81.5%
- 11am–2pm726 flights86.3%
- 2pm–5pm363 flights74.5%
- 5pm–8pm363 flights74.2%
- 8pm–5am2 flights—
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.8% of the time, against 74.2% for the evening window. That is 16 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 11am–2pm window is the busiest, with 726 flights scheduled in it.
Explore
Filter CPR to DEN by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On CPR to DEN, the best departure window is 5am–8am at 89.8% on time and the worst is 5pm–8pm at 74.2%, a wide gap of 15.6 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am89.8%
- 8–11am81.5%
- 11am–2pm86.3%
- 2–5pm74.5%
- 5–8pm74.2%
- 8pm–5am—
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 20 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
August is the worst month at 71.2% on time, 20 points below November, the best at 91.2%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. August was the busiest month here, with 243 flights.
Across the week, Tuesday is the strongest day at 86.0% on time and Friday the weakest at 78.6%, a spread of 7 points.
Delay causes
Why this route gets delayed
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 40,000 reported delay minutes.
- 37%Carrier
- 36%Late-arriving aircraft
- 17%National Airspace System
- 10%Extreme weather
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 40,000 reported delay minutes here, that single category outweighs weather by 4 to one. The split is drawn from 39,964 reported delay minutes.
The largest share of delay minutes, 37%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 15,000 of the 40,000 delay minutes reported here.
Cancellations sit at 0.95% against a national 1.89%, which is ordinary. Diversions add another 0.30%.
Connections and stage length
What a delay here actually costs
7.5% 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 an hour and a half, which a normal layover absorbs.
At 230 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 77.7% on time across 2,629 flights, 5 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 5 points of difference.
The sample behind these figures is 2,629 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in DEN after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. November runs 91.2% on time and August 71.2%, a swing of 20 points. If the dates move at all, move them out of August before you think about anything else. 2,596 completed flights over 12 months sit behind that.
Common questions
CPR to DEN questions
How often is CPR to DEN delayed?
About one flight in six arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 16.9% of the 2,629 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
How reliable is CPR to DEN compared with the rest of the country?
83.1% of flights arrive on time here against a national 77.3%, a difference of 6 points in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on CPR to DEN?
The 5am–8am departure window is the strongest at 89.8% on time. The 5pm–8pm window is the weakest at 74.2%, 16 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are August delays on CPR to DEN?
August is the weakest month at 71.2% on time, compared with 91.2% in November. Across the year that is 20 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- DEN to CPR — the return legseparate record
- Denver International (DEN) delay statistics
- PHX to DEN, a related route76.7%
- SLC to DEN, a related route79.0%
- LAX to DEN, a related route81.6%
- SkyWest Airlines on-time record83.1%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. CPR to DEN and DEN to CPR are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.