Flight Reliability
F9 4856 · Frontier Airlines
Denver → Houston (DEN–IAH)
91
Nerd Approved
WanderNerd Reliability Score
- 83%
- Arrive within 15 minutes
- 6 min early
- Average arrival delay
- 0%
- Cancelled
- 17 min early
- Median arrival delay
Based on 36 historical flights. Data through May 2026.
What the data says
A bit ahead of the DEN–IAH route.
F9 4856 arrived on time 83% of the time, versus 79% across the DEN–IAH route.
Better than the Frontier Airlines network average.
F9 4856 arrived on time 83% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon—(4 flights)
- Tue75%(12 flights)
- Wed—(3 flights)
- Thu—(5 flights)
- Fri—(3 flights)
- Sat—(3 flights)
- Sun—(6 flights)
- Departures on time
- 75%
- Diverted
- 0%
- Flights flown
- 36
- Months covered
- 3
Same route, other flights
Keep nerding
Based on 36 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.