Skip to content
WanderNerd
Check a flight

Flight Reliability

F9 3600 · Frontier Airlines

Denver → Atlanta (DEN–ATL)

84
Pretty Reliable
WanderNerd Reliability Score
80%
Arrive within 15 minutes
4 min
Average arrival delay
0.6%
Cancelled
7 min early
Median arrival delay

Based on 326 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

F9 3600 departing between 12–3 PM arrived on time 83% of the time, versus 60% between 3–6 PM.

Skip Thursday if you can.

F9 3600 arrived on time 87% of the time on Wednesdays. On Thursdays: 74%.

A bit ahead of the Frontier Airlines network.

F9 3600 arrived on time 80% of the time, versus 73% across the Frontier Airlines network.

Slipping a little lately.

F9 3600 arrived on time 73% 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
  • Mon82%(51 flights)
  • Tue74%(39 flights)
  • Wed87%(39 flights)
  • Thu74%(50 flights)
  • Fri77%(51 flights)
  • Sat83%(41 flights)
  • Sun81%(52 flights)
On-time by departure window
  • 6–9 AM—(7 flights)
  • 9 AM–12 PM61%(31 flights)
  • 12–3 PM83%(271 flights)
  • 3–6 PM60%(10 flights)
  • 6–9 PM—(4 flights)
On-time trend by month
61%
May

Jun 67% → May 61% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%24
July 202580%30
August 202590%30
September 202580%30
October 202587%31
November 202593%30
December 202583%23
January 202677%17
February 202672%25
March 202673%30
April 202683%30
May 202661%23
Departures on time
75%
Diverted
0.3%
Flights flown
323
Months covered
12

Same route, other flights

Keep nerding

Based on 326 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.