Flight Reliability
F9 4612 · Frontier Airlines
Las Vegas → Denver (LAS–DEN)
75
Usually Fine
WanderNerd Reliability Score
- 71%
- Arrive within 15 minutes
- 16 min
- Average arrival delay
- 0.4%
- Cancelled
- 8 min early
- Median arrival delay
Based on 281 historical flights. Data through May 2026.
What the data says
Thursdays have been rough.
F9 4612 arrived on time 85% of the time on Tuesdays and just 64% on Thursdays. That gap is worth planning around.
A bit behind the LAS–DEN route.
F9 4612 arrived on time 71% of the time, versus 77% across the LAS–DEN route.
Recent months have been rougher.
F9 4612 arrived on time 72% of the time over the last three months in the data, compared with 79% in the three months before that.
The breakdown
- Mon67%(51 flights)
- Tue85%(27 flights)
- Wed81%(26 flights)
- Thu64%(50 flights)
- Fri70%(50 flights)
- Sat76%(25 flights)
- Sun71%(51 flights)
- 3–6 PM71%(41 flights)
- 6–9 PM72%(180 flights)
- 9 PM–12 AM70%(59 flights)
71%
May
Jun 59% → May 71% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 59% | 17 |
| July 2025 | 40% | 15 |
| August 2025 | 67% | 18 |
| September 2025 | 62% | 21 |
| October 2025 | 72% | 25 |
| November 2025 | 85% | 27 |
| December 2025 | 79% | 29 |
| January 2026 | 68% | 19 |
| February 2026 | 90% | 20 |
| March 2026 | 66% | 29 |
| April 2026 | 79% | 29 |
| May 2026 | 71% | 31 |
- Departures on time
- 68%
- Diverted
- 0%
- Flights flown
- 280
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 281 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.