Denver (DEN) to Butte (BTM): On-Time Performance
Data through July 2026
The calendar drives reliability on DEN–BTM. November 2025 flights landed on schedule 97% of the time, but June 2025 dropped to 43% — a gap of 53 points. Across the full period the route averages 70% on-time against a national 78%.
- On-time
- 70%
- arrived <15 min late
- Avg delay
- 37 min
- completed flights
- Cancelled
- 1.7%
- Flights/day
- 1.0
- last 12 months
- Duration
- 2h 4m
- scheduled
- Distance
- 578 mi
Monthly on-time trend
Best time to fly from DEN to BTM
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 71% | 26 min |
| Tuesday | 78% | 33 min |
| Wednesday | 68% | 51 min |
| Thursday | 64% | 48 min |
| Friday | 67% | 23 min |
| Saturdaybest | 81% | 37 min |
| Sunday | 63% | 38 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft39%
- Airline operations32%
- National airspace system20%
- Weather10%
Frequently asked questions
- How often are flights from DEN to BTM delayed?
- 30% of DEN–BTM flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 37 minutes.
- How long is the flight from DEN to BTM?
- The scheduled DEN–BTM flight time averages 2h 4m over 578 miles. Actual arrival times vary — flights on this route land 15+ minutes late 30% of the time.
- How often are DEN to BTM flights cancelled?
- 1.7% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from DEN to BTM?
- June 2025 was the roughest month in this dataset, with only 43% of arrivals on time. The best was November 2025 at 97%. If your dates are flexible, that 53-point gap is worth planning around.
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Based on 575 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.