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Flight Reliability

F9 4372 · Frontier Airlines

Santa Ana → Denver (SNA–DEN)

89
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
5 min
Average arrival delay
0.7%
Cancelled
8 min early
Median arrival delay

Based on 303 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

F9 4372 departing between 9 AM–12 PM arrived on time 89% of the time, versus 80% between 12–3 PM.

Tuesdays have been rough.

F9 4372 arrived on time 92% of the time on Saturdays and just 73% on Tuesdays. That gap is worth planning around.

Better than the Frontier Airlines network average.

F9 4372 arrived on time 84% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon84%(49 flights)
  • Tue73%(26 flights)
  • Wed89%(27 flights)
  • Thu81%(48 flights)
  • Fri78%(51 flights)
  • Sat92%(47 flights)
  • Sun89%(53 flights)
On-time by departure window
  • 9 AM–12 PM89%(131 flights)
  • 12–3 PM80%(161 flights)
  • 3–6 PM—(9 flights)
On-time trend by month
96%
May

Jun 79% → May 96% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%28
July 202583%30
August 202570%27
September 202579%29
October 202596%24
November 202590%30
December 202581%31
January 202683%23
February 2026100%16
March 202676%21
April 202684%19
May 202696%23
Departures on time
82%
Diverted
0%
Flights flown
301
Months covered
12

Same route, other flights

Keep nerding

Based on 303 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.