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Flight Reliability

F9 3138 · Frontier Airlines

Denver → Miami (DEN–MIA)

67
Usually Fine
WanderNerd Reliability Score
68%
Arrive within 15 minutes
14 min
Average arrival delay
1.7%
Cancelled
1 min
Median arrival delay

Based on 173 historical flights. Data through May 2026.

What the data says

The 12–3 AM departure wins.

F9 3138 departing between 12–3 AM arrived on time 72% of the time, versus 54% between 9 AM–12 PM.

Friday is doing you no favors.

F9 3138 arrived on time 86% of the time on Thursdays and just 52% on Fridays. That gap is worth planning around.

A bit behind the DEN–MIA route.

F9 3138 arrived on time 68% of the time, versus 74% across the DEN–MIA route.

A bit behind the Frontier Airlines network.

F9 3138 arrived on time 68% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon67%(27 flights)
  • Tue62%(13 flights)
  • Wed53%(17 flights)
  • Thu86%(28 flights)
  • Fri52%(27 flights)
  • Sat69%(32 flights)
  • Sun77%(26 flights)
On-time by departure window
  • 12–3 AM72%(112 flights)
  • 6–9 AM—(5 flights)
  • 9 AM–12 PM54%(28 flights)
  • 3–6 PM—(1 flights)
  • 6–9 PM63%(24 flights)
On-time trend by month
25%
Mar

Jun 65% → Mar 25% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202565%26
July 202569%29
August 202562%26
September 202570%20
October 202577%22
November 202592%13
January 202663%16
March 202625%12
Departures on time
71%
Diverted
0%
Flights flown
170
Months covered
9

Same route, other flights

Keep nerding

Based on 173 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.