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Flight Reliability

F9 4891 · Frontier Airlines

Atlanta → Las Vegas (ATL–LAS)

56
A Little Dicey
WanderNerd Reliability Score
67%
Arrive within 15 minutes
20 min
Average arrival delay
2.6%
Cancelled
0 min
Median arrival delay

Based on 266 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

F9 4891 departing between 6–9 AM arrived on time 79% of the time, versus 64% between 9 AM–12 PM.

Mondays have been rough.

F9 4891 arrived on time 83% of the time on Thursdays and just 50% on Mondays. That gap is worth planning around.

Lagging the ATL–LAS route.

F9 4891 arrived on time 67% of the time, versus 76% across the ATL–LAS route.

A bit behind the Frontier Airlines network.

F9 4891 arrived on time 67% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon50%(36 flights)
  • Tue68%(37 flights)
  • Wed69%(36 flights)
  • Thu83%(36 flights)
  • Fri73%(37 flights)
  • Sat60%(37 flights)
  • Sun66%(38 flights)
On-time by departure window
  • 6–9 AM79%(14 flights)
  • 9 AM–12 PM64%(152 flights)
  • 12–3 PM70%(60 flights)
  • 3–6 PM65%(23 flights)
  • 6–9 PM—(8 flights)
On-time trend by month
68%
May

Jun 46% → May 68% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202546%28
July 202560%30
August 202568%22
November 202582%17
December 202583%30
January 202658%12
February 202679%19
March 202671%24
April 202666%29
May 202668%31
Departures on time
58%
Diverted
0.8%
Flights flown
257
Months covered
12

Same route, other flights

Keep nerding

Based on 266 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.