Historical on-time performance
Helena to Denver
594 miData through May 2026Source: US DOT · BTS
Flights on HLN–DEN arrive on time 75% of the time over the last 12 months.
On-time rate75%arrived within 15 min
p90 delay85 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 874 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- SkyWest AirlinesOn-time75%Medianon timep9085 minCancel0.9%Flights874
Why flights run late
Delay causes
- Airline37%
- Weather13%
- Air traffic (NAS)30%
- Late aircraft20%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather88%
- Air traffic (NAS)13%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 8 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly HLN → DEN
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 85% on time.
- Mornings85% on time · p90 30 min · 1,096 flights
- Afternoons72% on time · p90 85 min · 991 flights
- Evenings49% on time · p90 140 min · 155 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 79% on time.
- Tuesdays79% on time · p90 60 min · 334 flights
- Saturdays78% on time · p90 50 min · 333 flights
- Mondays77% on time · p90 70 min · 334 flights
- Wednesdays76% on time · p90 75 min · 334 flights
- Thursdays76% on time · p90 70 min · 333 flights
- Sundays75% on time · p90 100 min · 336 flights
- Fridays73% on time · p90 90 min · 336 flights
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