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Flight Reliability

F9 3521 · Frontier Airlines

Cincinnati → Las Vegas (CVG–LAS)

84
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
9 min
Average arrival delay
1.2%
Cancelled
9 min early
Median arrival delay

Based on 161 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

F9 3521 departing between 3–6 PM arrived on time 89% of the time, versus 76% between 6–9 PM.

Thursday has been the better bet.

A small edge: 86% on time on Thursdays against 80% on Mondays.

Better than the Frontier Airlines network average.

F9 3521 arrived on time 81% of the time, versus 73% across the Frontier Airlines network.

Trending in the right direction.

F9 3521 arrived on time 80% of the time over the last three months in the data, compared with 71% in the three months before that.

The breakdown

On-time by weekday
  • Mon80%(35 flights)
  • Tue—(1 flights)
  • Wed—(0 flights)
  • Thu86%(36 flights)
  • Fri81%(36 flights)
  • Sat—(7 flights)
  • Sun82%(44 flights)
On-time by departure window
  • 6–9 AM—(7 flights)
  • 12–3 PM77%(35 flights)
  • 3–6 PM89%(55 flights)
  • 6–9 PM76%(59 flights)
  • 9 PM–12 AM—(3 flights)
On-time trend by month
83%
May

Jun 100% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%18
July 202577%17
August 202591%11
December 202560%15
January 202678%18
February 202675%16
March 202681%21
April 202677%13
May 202683%18
Departures on time
78%
Diverted
0%
Flights flown
159
Months covered
12

Same route, other flights

Keep nerding

Based on 161 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.