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Flight Reliability

F9 1375 · Frontier Airlines

Denver → Phoenix (DEN–PHX)

89
Pretty Reliable
WanderNerd Reliability Score
85%
Arrive within 15 minutes
3 min
Average arrival delay
1.0%
Cancelled
8 min early
Median arrival delay

Based on 312 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

F9 1375 departing between 6–9 AM arrived on time 90% of the time, versus 75% between 9 AM–12 PM.

Wednesdays have been rough.

F9 1375 arrived on time 92% of the time on Sundays and just 73% on Wednesdays. That gap is worth planning around.

Better than the DEN–PHX route average.

F9 1375 arrived on time 85% of the time, versus 76% across the DEN–PHX route.

Better than the Frontier Airlines network average.

F9 1375 arrived on time 85% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon80%(51 flights)
  • Tue81%(31 flights)
  • Wed73%(30 flights)
  • Thu89%(52 flights)
  • Fri90%(51 flights)
  • Sat79%(43 flights)
  • Sun92%(51 flights)
On-time by departure window
  • 3–6 AM—(3 flights)
  • 6–9 AM90%(200 flights)
  • 9 AM–12 PM75%(100 flights)
  • 12–3 PM—(6 flights)
On-time trend by month
92%
May

Jun 76% → May 92% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%25
July 202586%29
August 202584%31
September 202590%30
October 202574%31
November 202579%29
December 202592%25
January 202672%18
February 202696%24
March 202679%24
April 202695%19
May 202692%24
Departures on time
88%
Diverted
0%
Flights flown
309
Months covered
12

Same route, other flights

Keep nerding

Based on 312 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.