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Flight Reliability

F9 1500 · Frontier Airlines

Ontario → Denver (ONT–DEN)

91
Nerd Approved
WanderNerd Reliability Score
85%
Arrive within 15 minutes
4 min
Average arrival delay
0.6%
Cancelled
7 min early
Median arrival delay

Based on 314 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

F9 1500 departing between 6–9 AM arrived on time 90% of the time, versus 77% between 12–3 AM.

Sunday scaries are real for this one.

F9 1500 arrived on time 93% of the time on Thursdays. On Sundays: 79%.

A bit ahead of the ONT–DEN route.

F9 1500 arrived on time 85% of the time, versus 79% across the ONT–DEN route.

Better than the Frontier Airlines network average.

F9 1500 arrived on time 85% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon83%(47 flights)
  • Tue80%(46 flights)
  • Wed88%(43 flights)
  • Thu93%(44 flights)
  • Fri86%(44 flights)
  • Sat87%(45 flights)
  • Sun79%(43 flights)
On-time by departure window
  • 12–3 AM77%(123 flights)
  • 6–9 AM90%(187 flights)
  • 3–6 PM—(2 flights)
On-time trend by month
97%
May

Jun 75% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202575%24
July 202570%30
August 202574%31
October 202583%24
November 202597%30
December 202578%18
January 202694%31
February 202689%28
March 202684%31
April 202693%30
May 202697%31
Departures on time
84%
Diverted
0%
Flights flown
312
Months covered
12

Same route, other flights

Keep nerding

Based on 314 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.