Denver (DEN) to Helena (HLN): On-Time Performance
Data through May 2026
The calendar drives reliability on DEN–HLN. April 2026 flights landed on schedule 95% of the time, but February 2025 dropped to 59% — a gap of 36 points. Across the full period the route averages 77% on-time against a national 78%. Morning departures also hold up better than evening ones (82% vs 73%), which matters most in the rough months.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 19 min
- completed flights
- Cancelled
- 1.1%
- Flights/day
- 2.4
- last 12 months
- Duration
- 2h 4m
- scheduled
- Distance
- 594 mi
Monthly on-time trend
Best time to fly from DEN to HLN
Aim for departures around 11 a.m. (82% on-time); avoid 7 p.m. departures (73%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 17 min |
| Tuesday | 80% | 15 min |
| Wednesdaybest | 80% | 21 min |
| Thursday | 76% | 22 min |
| Friday | 76% | 19 min |
| Saturday | 79% | 19 min |
| Sunday | 73% | 20 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 operations30%
- National airspace system22%
- Weather9%
Frequently asked questions
- How often are flights from DEN to HLN delayed?
- 23% of DEN–HLN flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 19 minutes.
- What is the best time of day to fly from DEN to HLN?
- Departures around 11 a.m. have the best record (82% on-time), while departures around 7 p.m. have the worst (73%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from DEN to HLN?
- The scheduled DEN–HLN flight time averages 2h 4m over 594 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are DEN to HLN flights cancelled?
- 1.1% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from DEN to HLN?
- February 2025 was the roughest month in this dataset, with only 59% of arrivals on time. The best was April 2026 at 95%. If your dates are flexible, that 36-point gap is worth planning around.
Explore related pages
More routes from DEN
Based on 1,613 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.