Skip to content
WanderNerd
Check a flight

Flight Reliability

F9 4136 · Frontier Airlines

Cleveland → Miami (CLE–MIA)

71
Usually Fine
WanderNerd Reliability Score
73%
Arrive within 15 minutes
14 min
Average arrival delay
1.6%
Cancelled
6 min early
Median arrival delay

Based on 191 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

F9 4136 departing between 9 AM–12 PM arrived on time 84% of the time, versus 57% between 3–6 PM.

Sunday scaries are real for this one.

F9 4136 arrived on time 84% of the time on Fridays and just 58% on Sundays. That gap is worth planning around.

Lagging the CLE–MIA route.

F9 4136 arrived on time 73% of the time, versus 81% across the CLE–MIA route.

Recent months have been rougher.

F9 4136 arrived on time 56% of the time over the last three months in the data, compared with 77% in the three months before that.

The breakdown

On-time by weekday
  • Mon81%(41 flights)
  • Tue—(3 flights)
  • Wed—(1 flights)
  • Thu67%(30 flights)
  • Fri84%(45 flights)
  • Sat78%(27 flights)
  • Sun58%(40 flights)
On-time by departure window
  • 6–9 AM80%(45 flights)
  • 9 AM–12 PM84%(37 flights)
  • 12–3 PM80%(39 flights)
  • 3–6 PM57%(51 flights)
  • 6–9 PM67%(15 flights)
On-time trend by month
72%
Apr

Jun 93% → Apr 72% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%14
July 202580%20
August 202565%20
September 202582%17
October 202575%16
November 202591%21
December 202565%20
January 202653%17
March 202643%14
April 202672%18
Departures on time
78%
Diverted
0.5%
Flights flown
187
Months covered
12

Same route, other flights

Keep nerding

Based on 191 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.