Flight Reliability
F9 4791 · Frontier Airlines
FSD → Denver (FSD–DEN)
72
Usually Fine
WanderNerd Reliability Score
- 65%
- Arrive within 15 minutes
- 13 min
- Average arrival delay
- 0%
- Cancelled
- 5 min early
- Median arrival delay
Based on 78 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
F9 4791 departing between 12–3 PM arrived on time 82% of the time, versus 49% between 6–9 PM.
Mondays have been rough.
F9 4791 arrived on time 85% of the time on Sundays and just 57% on Mondays. That gap is worth planning around.
Lagging the FSD–DEN route.
F9 4791 arrived on time 65% of the time, versus 77% across the FSD–DEN route.
Lagging the Frontier Airlines network.
F9 4791 arrived on time 65% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon57%(23 flights)
- Tue—(0 flights)
- Wed64%(11 flights)
- Thu—(8 flights)
- Fri61%(23 flights)
- Sat—(0 flights)
- Sun85%(13 flights)
- 12–3 PM82%(38 flights)
- 3–6 PM—(5 flights)
- 6–9 PM49%(35 flights)
90%
Nov
Jul 54% → Nov 90% on time
| Month | On-time percentage | Flights |
|---|---|---|
| July 2025 | 54% | 13 |
| August 2025 | 59% | 17 |
| September 2025 | 62% | 13 |
| October 2025 | 88% | 17 |
| November 2025 | 90% | 10 |
- Departures on time
- 68%
- Diverted
- 0%
- Flights flown
- 78
- Months covered
- 6
Same route, other flights
Keep nerding
Based on 78 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.