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Flight Reliability

F9 1280 · Frontier Airlines

Denver → Miami (DEN–MIA)

83
Pretty Reliable
WanderNerd Reliability Score
77%
Arrive within 15 minutes
6 min
Average arrival delay
0.6%
Cancelled
6 min early
Median arrival delay

Based on 172 historical flights. Data through May 2026.

What the data says

Tuesdays have been rough.

F9 1280 arrived on time 92% of the time on Thursdays and just 62% on Tuesdays. That gap is worth planning around.

A bit ahead of the DEN–MIA route.

F9 1280 arrived on time 77% of the time, versus 74% across the DEN–MIA route.

A bit ahead of the Frontier Airlines network.

F9 1280 arrived on time 77% of the time, versus 73% across the Frontier Airlines network.

Ticking up lately.

F9 1280 arrived on time 80% of the time over the last three months in the data, compared with 76% in the three months before that.

The breakdown

On-time by weekday
  • Mon78%(23 flights)
  • Tue62%(21 flights)
  • Wed86%(22 flights)
  • Thu92%(24 flights)
  • Fri70%(27 flights)
  • Sat85%(27 flights)
  • Sun67%(27 flights)
On-time by departure window
  • 9 AM–12 PM—(4 flights)
  • 6–9 PM—(6 flights)
  • 9 PM–12 AM79%(161 flights)
On-time trend by month
74%
May

Nov 73% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
November 202573%11
December 202567%30
January 202671%14
February 202691%22
March 202670%30
April 202697%29
May 202674%31
Departures on time
74%
Diverted
0%
Flights flown
171
Months covered
8

Same route, other flights

Keep nerding

Based on 172 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.