Helena (HLN) to Denver (DEN): On-Time Performance
Data through July 2026
When you fly HLN to DEN matters as much as anything else about the booking: the route swung from 94% on-time in May 2026 to just 49% in July 2025. Across the full period the route averages 76% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 50%), which matters most in the rough months.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 27 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 2.2
- last 12 months
- Duration
- 2h 6m
- scheduled
- Distance
- 594 mi
Monthly on-time trend
Best time to fly from HLN to DEN
Aim for departures around 6 a.m. (88% on-time); avoid 5 p.m. departures (50%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 22 min |
| Tuesday | 77% | 23 min |
| Wednesday | 75% | 29 min |
| Thursday | 76% | 32 min |
| Friday | 75% | 35 min |
| Saturdaybest | 78% | 24 min |
| Sunday | 77% | 25 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft22%
- Airline operations43%
- National airspace system24%
- Weather12%
Frequently asked questions
- How often are flights from HLN to DEN delayed?
- 24% of HLN–DEN 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 27 minutes.
- What is the best time of day to fly from HLN to DEN?
- Departures around 6 a.m. have the best record (88% on-time), while departures around 5 p.m. have the worst (50%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from HLN to DEN?
- The scheduled HLN–DEN flight time averages 2h 6m over 594 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are HLN to DEN flights cancelled?
- 0.8% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from HLN to DEN?
- July 2025 was the roughest month in this dataset, with only 49% of arrivals on time. The best was May 2026 at 94%. If your dates are flexible, that 44-point gap is worth planning around.
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Based on 1,674 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.