Flight Reliability
F9 2109 · Frontier Airlines
Miami → Chicago (MIA–MDW)
83
Pretty Reliable
WanderNerd Reliability Score
- 82%
- Arrive within 15 minutes
- 6 min
- Average arrival delay
- 1.6%
- Cancelled
- 6 min early
- Median arrival delay
Based on 61 historical flights. Data through May 2026.
What the data says
Morning flights do better here.
F9 2109 departing between 9 AM–12 PM arrived on time 82% of the time, versus 70% between 6–9 PM.
Thursday is the weak spot.
F9 2109 arrived on time 83% of the time on Mondays. On Thursdays: 70%.
Better than the MIA–MDW route average.
F9 2109 arrived on time 82% of the time, versus 74% across the MIA–MDW route.
Better than the Frontier Airlines network average.
F9 2109 arrived on time 82% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon83%(12 flights)
- Tue—(0 flights)
- Wed—(4 flights)
- Thu70%(10 flights)
- Fri—(9 flights)
- Sat80%(15 flights)
- Sun80%(10 flights)
- 6–9 AM—(2 flights)
- 9 AM–12 PM82%(39 flights)
- 12–3 PM—(4 flights)
- 3–6 PM—(4 flights)
- 6–9 PM70%(10 flights)
- 9 PM–12 AM—(1 flights)
- Departures on time
- 78%
- Diverted
- 0%
- Flights flown
- 60
- Months covered
- 7
Same route, other flights
Keep nerding
Based on 61 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.