82% of flights leaving Casper (CPR) arrived on time over the past 12 months, 6 points better than the national average of 76%. About 7 flights leave CPR on a typical day; 0.9% were cancelled. 83% pushed back from the gate on time, so most of the lateness is already there when the flight leaves the gate.
At a glance
- Best hour to fly: 5 a.m. (92% on time). Worst: 3 p.m. (74%).
- Best month: September (86%). Worst: June (73%).
- Biggest delay cause: the airlines themselves (37% of delay minutes).
- Year on year: improving (74% → 82%).
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for flights leaving CPR: when a flight was late, it was under 45 minutes late 46% of the time. About 1 in 14 flights landed an hour or more late, and 1 in 42 three hours or more; 1.0% were cancelled outright.
- On time or early82%
- 15–30 min late5.2%
- 30–60 min late4.3%
- 1–2 hours late3.2%
- 2–3 hours late1.7%
- 3+ hours late2.4%
- Diverted0.3%
- Cancelled1.0%
Share of all 2,629 scheduled flights, past 12 months, by arrival time against schedule.
Best time of day to fly out of CPR
Time of day matters more at CPR than almost anything else you control. Flights scheduled to leave at 5 a.m. arrived on time 92% of the time; at 3 p.m. it was 74%, a 17-point gap. Taken together, early departures (5–9 a.m.) ran 87% on time against 71% for the evening bank (5–10 p.m.). Early planes usually start the day at the airport, so they haven't had a chance to pick up delays elsewhere. By evening a late inbound aircraft, a crew running out of duty hours or an afternoon thunderstorm can push one late flight into the next. Cancellations cluster too: 11 a.m. departures were cancelled 1.9% of the time, against 0.9% overall.
Hour × month
Combine the two and the spread is wider still. The most reliable combination at CPR was a 5 a.m. departure in June (89% on time); the least, 3 p.m. in November (79%). If you can only move one thing, move the hour. Departure hour usually shifts the odds more than the month does.
Each cell: on-time rate for that departure hour in that calendar month, 2023–2026. Find your travel month, then look along the row for the greenest hour.
Best and worst months
June is the hardest month at CPR, with 73% of flights on time across 2023–2026; September is the best at 86%. Summer (June–August) runs 8 points worse than autumn: heavy schedules, peak loads and afternoon thunderstorms. Winter costs 3 points against autumn. Cancellations peak in April (2.5% of flights).
Airlines at CPR
United Airlines runs 100% of departures from CPR, so CPR is effectively its hub. When United Airlines has a bad day, so does the airport.
| Airline | Departures | On time | Left on time | Cancelled | Typical arrival |
|---|---|---|---|---|---|
| United Airlines | 2,629 | 82% | 83% | 0.9% | −12 min |
Why flights are late at CPR
Airlines report a cause for every flight that arrives 15 or more minutes late. At CPR, 37% of delay minutes came from the airlines themselves: crew, maintenance, cleaning, fueling and baggage. Next is late-arriving aircraft at 36%.
The average taxi from gate to takeoff is 23 minutes, longer than at most large U.S. airports. Airlines pad schedules for it, but a long queue on a busy afternoon still eats into the buffer.
Month by month
Over the latest 12 months 82% of CPR departures were on time, against 74% in the 12 months before, an improvement of 8 points. The best recent month was November 2025 (90%); the worst, August 2026 (69%).
Last flights of the day
The last flight of the day is a different bet. Across routes from CPR, each airline's final departure was cancelled 1.4% of the time, against 0.9% for its earlier flights (1.6× as often). Late in the day crews run short on duty hours, aircraft arrive late from elsewhere, and with no later flight to fold passengers into, cancelling is easier for the airline. 1.9% of last flights landed 3+ hours late. The riskiest last flight out was United Airlines to Denver (1.4% cancelled).
| Last flight to | Airline | Leaves | Cancelled | 3h+ late | On time |
|---|---|---|---|---|---|
| DEN Denver | United Airlines | 6:13 p.m. | 1.4% | 1.9% | 73% |
Each airline's last scheduled departure of the day on a route, on days it flies the route at least twice; past 12 months. Riskiest first.
Tips for flying out of CPR
- Book the earliest departure you can live with. At CPR the 5 a.m. flights do best.
- Traveling in June? Leave extra slack for anything that can't move: cruises, weddings, the last connection of the day.
- Need to arrive tonight? Don't book the last flight out of CPR; the one before it leaves you a backup.
- Delayed already? Most delays at CPR come from the airlines themselves. If your inbound plane is late, your flight will be too, whatever the board says.
Routes from CPR
Least reliable first. Routes with at least 365 flights a year.
| To | Flights | On time | Cancelled | Typical arrival |
|---|---|---|---|---|
| DEN Denver | 2,629 | 82% | 0.9% | −12 min |
Flights into CPR
Arriving rather than leaving? These are the routes into Casper-Natrona, least reliable first. The weakest is from Denver (77% on time).
| From | Flights | On time | Cancelled |
|---|---|---|---|
| DEN Denver | 2,629 | 77% | 0.9% |
Questions about CPR delays
What is the best time to fly out of CPR?
Flights scheduled at 5 a.m.: over the past year 92% of CPR departures at that hour arrived on time, against 74% at 3 p.m., the worst hour.
What month has the most flight delays at CPR?
June (73% on time). September is the best month (86%).
Why are flights delayed at CPR?
The biggest cause was the airlines themselves (37% of delay minutes): crew, maintenance, cleaning, fueling and baggage. Then late-arriving aircraft (36%).
How often are flights cancelled at CPR?
0.9% of scheduled departures over the past 12 months, peaking in April at 2.5%.
Hours are scheduled local departure times. "On time" means arriving less than 15 minutes late at the destination; cancelled and diverted flights count as not on time. Method.