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Flight Reliability

F9 4551 · Frontier Airlines

Miami → Las Vegas (MIA–LAS)

83
Pretty Reliable
WanderNerd Reliability Score
80%
Arrive within 15 minutes
5 min
Average arrival delay
1.1%
Cancelled
7 min early
Median arrival delay

Based on 95 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

F9 4551 departing between 6–9 AM arrived on time 84% of the time, versus 46% between 6–9 PM.

Friday is doing you no favors.

F9 4551 arrived on time 90% of the time on Thursdays and just 74% on Fridays. That gap is worth planning around.

A bit ahead of the MIA–LAS route.

F9 4551 arrived on time 80% of the time, versus 74% across the MIA–LAS route.

A bit ahead of the Frontier Airlines network.

F9 4551 arrived on time 80% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon88%(17 flights)
  • Tue—(7 flights)
  • Wed—(6 flights)
  • Thu90%(19 flights)
  • Fri74%(19 flights)
  • Sat89%(18 flights)
  • Sun—(8 flights)
On-time by departure window
  • 6–9 AM84%(83 flights)
  • 6–9 PM46%(11 flights)
On-time trend by month
50%
May

Jun 67% → May 50% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%18
July 2025100%17
August 2025100%11
December 202585%13
April 202694%17
May 202650%12
Departures on time
75%
Diverted
0%
Flights flown
94
Months covered
7

Same route, other flights

Keep nerding

Based on 95 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.