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Flight Reliability

F9 3565 · Frontier Airlines

Detroit → Denver (DTW–DEN)

91
Nerd Approved
WanderNerd Reliability Score
85%
Arrive within 15 minutes
2 min
Average arrival delay
0.5%
Cancelled
12 min early
Median arrival delay

Based on 205 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

F9 3565 departing between 6–9 AM arrived on time 95% of the time, versus 74% between 3–6 PM.

Tuesdays have been rough.

F9 3565 arrived on time 92% of the time on Wednesdays and just 75% on Tuesdays. That gap is worth planning around.

A bit ahead of the DTW–DEN route.

F9 3565 arrived on time 85% of the time, versus 80% across the DTW–DEN route.

Better than the Frontier Airlines network average.

F9 3565 arrived on time 85% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon82%(39 flights)
  • Tue75%(12 flights)
  • Wed92%(12 flights)
  • Thu87%(38 flights)
  • Fri91%(42 flights)
  • Sat89%(18 flights)
  • Sun79%(43 flights)
On-time by departure window
  • 6–9 AM95%(19 flights)
  • 9 AM–12 PM91%(107 flights)
  • 12–3 PM76%(38 flights)
  • 3–6 PM74%(38 flights)
  • 6–9 PM—(2 flights)
On-time trend by month
96%
May

Jun 77% → May 96% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202577%17
July 2025100%16
August 202589%18
November 2025100%16
December 202552%23
January 202677%17
February 202667%12
March 202693%27
April 202694%17
May 202696%28
Departures on time
84%
Diverted
0%
Flights flown
204
Months covered
12

Same route, other flights

Keep nerding

Based on 205 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.