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Flight Reliability

F9 1821 · Frontier Airlines

Cleveland → Las Vegas (CLE–LAS)

79
Usually Fine
WanderNerd Reliability Score
76%
Arrive within 15 minutes
14 min
Average arrival delay
0.6%
Cancelled
6 min early
Median arrival delay

Based on 322 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

F9 1821 departing between 3–6 PM arrived on time 78% of the time, versus 58% between 9 AM–12 PM.

Sunday scaries are real for this one.

F9 1821 arrived on time 85% of the time on Wednesdays and just 67% on Sundays. That gap is worth planning around.

A bit ahead of the Frontier Airlines network.

F9 1821 arrived on time 76% of the time, versus 73% across the Frontier Airlines network.

Trending in the right direction.

F9 1821 arrived on time 73% of the time over the last three months in the data, compared with 66% in the three months before that.

The breakdown

On-time by weekday
  • Mon68%(47 flights)
  • Tue79%(43 flights)
  • Wed85%(48 flights)
  • Thu70%(43 flights)
  • Fri84%(43 flights)
  • Sat81%(47 flights)
  • Sun67%(48 flights)
On-time by departure window
  • 9 AM–12 PM58%(12 flights)
  • 12–3 PM68%(19 flights)
  • 3–6 PM78%(175 flights)
  • 6–9 PM76%(72 flights)
  • 9 PM–12 AM76%(41 flights)
On-time trend by month
77%
May

Jun 79% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%29
July 202587%30
August 202584%31
September 202587%30
October 202577%31
November 202573%30
December 202570%10
January 202656%27
February 202671%14
March 202665%26
April 202677%30
May 202677%31
Departures on time
76%
Diverted
0.3%
Flights flown
319
Months covered
12

Same route, other flights

Keep nerding

Based on 322 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.