Route reliability record
DEN→CPR
Denver to Casper
- Flights
- 2,629
- Period
- September 2025 to August 2026
- Distance
- 230 mi
- Carriers
- 1
This route lands a B+, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 2,629 DEN to CPR flights, with a median arrival 7 minutes early.
Best time to fly DEN to CPR: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 87.4% of the time and Tuesday flights 81.6%, against 77.7% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
77.7%
Arrivals under 15 minutes late, of 2,597 completed flights
Avg delay
82 min
Across delayed arrivals only, not all flights
Cancelled
0.95%
National rate is 1.89%
Best carrier
SkyWest
77.7% on time across 2,629 flights
These figures cover 2,629 flights between September 2025 and August 2026. Beyond the headline rate, 8.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on DEN to CPR
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 | 77.7% | 82 min | 0.95% | B+ |
Flight by flight
Flights on DEN to CPR
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–8am103 flights87.4%
- 8am–11am348 flights82.4%
- 11am–2pm723 flights82.0%
- 2pm–5pm369 flights73.1%
- 5pm–8pm725 flights71.3%
- 8pm–5am361 flights79.4%
Scale runs 65% to 95%.
Book the early departure. Flights leaving between 5am–8am arrive on time 87.4% of the time, against 71.3% 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 5pm–8pm window is the busiest, with 725 flights scheduled in it.
Explore
Filter DEN to CPR 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 DEN to CPR, the best departure window is 5am–8am at 87.4% on time and the worst is 5pm–8pm at 71.3%, a wide gap of 16.1 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am87.4%
- 8–11am82.4%
- 11am–2pm82.0%
- 2–5pm73.1%
- 5–8pm71.3%
- 8pm–5am79.4%
best all US flightsScale 60% to 95%.
Across the year
When delays peak on this route
This route's year swings by 28 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.
June is the worst month at 62.3% on time, 28 points below November, the best at 90.7%. 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 81.6% on time and Thursday the weakest at 74.0%, a spread of 8 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 47,000 reported delay minutes.
- 40%Carrier
- 37%Late-arriving aircraft
- 16%National Airspace System
- 8%Extreme weather
- 0%Security
37% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 47,000 reported delay minutes here, that single category outweighs weather by 5 to one. The split is drawn from 47,360 reported delay minutes.
The largest share of delay minutes, 40%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 19,000 of the 47,000 delay minutes reported here.
Cancellations sit at 0.95% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
Connections and stage length
What a delay here actually costs
8.5% 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 a little over an hour, 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 83.1% on time across 2,629 flights, 5 points above 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 CPR 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 90.7% on time and June 62.3%, a swing of 28 points. If the dates move at all, move them out of June before you think about anything else. 2,597 completed flights over 12 months sit behind that.
Common questions
DEN to CPR questions
How often is DEN to CPR delayed?
Roughly one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 22.3% of the 2,629 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
How reliable is DEN to CPR compared with the rest of the country?
77.7% of flights arrive on time here against a national 77.3%, a difference of half a point in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on DEN to CPR?
The 5am–8am departure window is the strongest at 87.4% on time. The 5pm–8pm window is the weakest at 71.3%, 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 June delays on DEN to CPR?
June is the weakest month at 62.3% on time, compared with 90.7% in November. Across the year that is 28 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
- CPR to DEN — the return legseparate record
- Denver International (DEN) delay statistics
- DEN to PHX, a related route75.6%
- DEN to SLC, a related route78.2%
- DEN to LAX, a related route78.7%
- SkyWest Airlines on-time record77.7%
- 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. DEN to CPR and CPR to DEN 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.