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Flight Reliability

F9 4371 · Frontier Airlines

Denver → Santa Ana (DEN–SNA)

94
Nerd Approved
WanderNerd Reliability Score
87%
Arrive within 15 minutes
1 min early
Average arrival delay
0.3%
Cancelled
9 min early
Median arrival delay

Based on 303 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

F9 4371 departing between 6–9 AM arrived on time 100% of the time, versus 86% between 9 AM–12 PM.

Skip Tuesday if you can.

F9 4371 arrived on time 93% of the time on Wednesdays. On Tuesdays: 81%.

A bit ahead of the DEN–SNA route.

F9 4371 arrived on time 87% of the time, versus 81% across the DEN–SNA route.

Better than the Frontier Airlines network average.

F9 4371 arrived on time 87% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon82%(49 flights)
  • Tue81%(26 flights)
  • Wed93%(27 flights)
  • Thu88%(48 flights)
  • Fri87%(52 flights)
  • Sat92%(47 flights)
  • Sun89%(53 flights)
On-time by departure window
  • 6–9 AM100%(19 flights)
  • 9 AM–12 PM86%(265 flights)
  • 12–3 PM94%(18 flights)
On-time trend by month
100%
May

Jun 90% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%29
July 202577%30
August 202567%27
September 202597%29
October 202592%24
November 202593%30
December 202577%31
January 202687%23
February 2026100%16
March 202686%21
April 202690%19
May 2026100%23
Departures on time
84%
Diverted
0%
Flights flown
302
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.