Flight Reliability
F9 4123 · Frontier Airlines
Miami → Austin (MIA–AUS)
94
Nerd Approved
WanderNerd Reliability Score
- 86%
- Arrive within 15 minutes
- 4 min
- Average arrival delay
- 0%
- Cancelled
- 11 min early
- Median arrival delay
Based on 55 historical flights. Data through May 2026.
What the data says
Morning flights do better here.
F9 4123 departing between 6–9 AM arrived on time 94% of the time, versus 74% between 3–6 PM.
Thursday comes out ahead.
A small edge: 90% on time on Thursdays against 84% on Sundays.
Better than the MIA–AUS route average.
F9 4123 arrived on time 86% of the time, versus 74% across the MIA–AUS route.
Better than the Frontier Airlines network average.
F9 4123 arrived on time 86% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon—(6 flights)
- Tue—(1 flights)
- Wed—(0 flights)
- Thu90%(20 flights)
- Fri—(3 flights)
- Sat—(0 flights)
- Sun84%(25 flights)
- 3–6 AM—(1 flights)
- 6–9 AM94%(33 flights)
- 3–6 PM74%(19 flights)
- 6–9 PM—(2 flights)
- Departures on time
- 86%
- Diverted
- 0%
- Flights flown
- 55
- Months covered
- 7
Same route, other flights
Keep nerding
Based on 55 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.