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Flight Reliability

F9 4104 · Frontier Airlines

San Jose → Las Vegas (SJC–LAS)

54
A Little Dicey
WanderNerd Reliability Score
70%
Arrive within 15 minutes
29 min
Average arrival delay
3.6%
Cancelled
1 min
Median arrival delay

Based on 111 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

F9 4104 departing between 9 AM–12 PM arrived on time 96% of the time, versus 52% between 12–3 PM.

Thursdays have been rough.

F9 4104 arrived on time 80% of the time on Sundays and just 64% on Thursdays. That gap is worth planning around.

Lagging the SJC–LAS route.

F9 4104 arrived on time 70% of the time, versus 80% across the SJC–LAS route.

A bit behind the Frontier Airlines network.

F9 4104 arrived on time 70% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon74%(35 flights)
  • Tue—(0 flights)
  • Wed—(0 flights)
  • Thu64%(22 flights)
  • Fri66%(35 flights)
  • Sat—(0 flights)
  • Sun80%(15 flights)
On-time by departure window
  • 6–9 AM—(3 flights)
  • 9 AM–12 PM96%(24 flights)
  • 12–3 PM52%(33 flights)
  • 6–9 PM70%(46 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
73%
May

Aug 67% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 202567%12
September 202567%12
October 202590%10
January 202686%14
February 202693%14
April 202662%13
May 202673%11
Departures on time
71%
Diverted
0%
Flights flown
107
Months covered
11

Same route, other flights

Keep nerding

Based on 111 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.