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Flight Reliability

F9 3971 · Frontier Airlines

Dallas–Fort Worth → Phoenix (DFW–PHX)

84
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
3 min
Average arrival delay
1.4%
Cancelled
12 min early
Median arrival delay

Based on 220 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

F9 3971 departing between 6–9 AM arrived on time 93% of the time, versus 83% between 9 AM–12 PM.

Mondays have been rough.

F9 3971 arrived on time 89% of the time on Sundays and just 72% on Mondays. That gap is worth planning around.

Better than the DFW–PHX route average.

F9 3971 arrived on time 81% of the time, versus 72% across the DFW–PHX route.

Better than the Frontier Airlines network average.

F9 3971 arrived on time 81% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon72%(32 flights)
  • Tue83%(30 flights)
  • Wed81%(31 flights)
  • Thu78%(36 flights)
  • Fri83%(30 flights)
  • Sat83%(30 flights)
  • Sun89%(28 flights)
On-time by departure window
  • 6–9 AM93%(14 flights)
  • 9 AM–12 PM83%(144 flights)
  • 12–3 PM85%(41 flights)
  • 3–6 PM—(1 flights)
  • 6–9 PM—(9 flights)
  • 9 PM–12 AM—(8 flights)
On-time trend by month
82%
May

Sep 55% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
September 202555%11
October 202571%14
November 202576%21
December 202587%31
January 202685%27
February 202693%27
March 202680%30
April 202679%24
May 202682%28
Departures on time
83%
Diverted
0%
Flights flown
217
Months covered
10

Same route, other flights

Keep nerding

Based on 220 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.