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Flight Reliability

F9 3566 · Frontier Airlines

Denver → Detroit (DEN–DTW)

95
Nerd Approved
WanderNerd Reliability Score
87%
Arrive within 15 minutes
4 min early
Average arrival delay
0%
Cancelled
13 min early
Median arrival delay

Based on 223 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

F9 3566 departing between 6–9 AM arrived on time 90% of the time, versus 79% between 12–3 PM.

Saturdays have been rough.

F9 3566 arrived on time 95% of the time on Fridays and just 79% on Saturdays. That gap is worth planning around.

Better than the DEN–DTW route average.

F9 3566 arrived on time 87% of the time, versus 78% across the DEN–DTW route.

Better than the Frontier Airlines network average.

F9 3566 arrived on time 87% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon84%(37 flights)
  • Tue83%(23 flights)
  • Wed91%(21 flights)
  • Thu89%(36 flights)
  • Fri95%(40 flights)
  • Sat79%(24 flights)
  • Sun83%(42 flights)
On-time by departure window
  • 6–9 AM90%(156 flights)
  • 9 AM–12 PM79%(47 flights)
  • 12–3 PM79%(14 flights)
  • 3–6 PM—(5 flights)
  • 6–9 PM—(1 flights)
On-time trend by month
95%
May

Jun 69% → May 95% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%26
July 202587%31
August 202586%29
September 2025100%11
December 202574%23
January 202688%17
March 202689%27
April 2026100%16
May 202695%20
Departures on time
87%
Diverted
0%
Flights flown
223
Months covered
12

Same route, other flights

Keep nerding

Based on 223 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.