Flight Reliability
F9 4373 · Frontier Airlines
Pittsburgh → Denver (PIT–DEN)
77
Usually Fine
WanderNerd Reliability Score
- 72%
- Arrive within 15 minutes
- 17 min
- Average arrival delay
- 0%
- Cancelled
- 11 min early
- Median arrival delay
Based on 58 historical flights. Data through May 2026.
What the data says
Monday has been the better bet.
A small edge: 71% on time on Mondays against 65% on Fridays.
Lagging the PIT–DEN route.
F9 4373 arrived on time 72% of the time, versus 82% across the PIT–DEN route.
The breakdown
- Mon71%(24 flights)
- Tue—(1 flights)
- Wed—(0 flights)
- Thu—(0 flights)
- Fri65%(26 flights)
- Sat—(2 flights)
- Sun—(5 flights)
- 3–6 PM72%(50 flights)
- 6–9 PM—(8 flights)
- Departures on time
- 72%
- Diverted
- 0%
- Flights flown
- 58
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 58 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.