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Flight Reliability

F9 4156 · Frontier Airlines

San Francisco → Las Vegas (SFO–LAS)

47
Bring Snacks
WanderNerd Reliability Score
62%
Arrive within 15 minutes
34 min
Average arrival delay
2.8%
Cancelled
1 min
Median arrival delay

Based on 181 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

F9 4156 departing between 12–3 PM arrived on time 79% of the time, versus 52% between 9 PM–12 AM.

Thursday is the weak spot.

F9 4156 arrived on time 62% of the time on Mondays. On Thursdays: 50%.

Lagging the SFO–LAS route.

F9 4156 arrived on time 62% of the time, versus 76% across the SFO–LAS route.

Lagging the Frontier Airlines network.

F9 4156 arrived on time 62% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon62%(47 flights)
  • Tue—(5 flights)
  • Wed—(8 flights)
  • Thu50%(24 flights)
  • Fri61%(51 flights)
  • Sat—(8 flights)
  • Sun58%(33 flights)
On-time by departure window
  • 12–3 PM79%(14 flights)
  • 3–6 PM74%(23 flights)
  • 6–9 PM77%(34 flights)
  • 9 PM–12 AM52%(105 flights)
On-time trend by month
45%
May

Jun 67% → May 45% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%12
August 202562%13
September 202550%16
October 202550%12
November 202562%13
December 202571%14
January 202673%15
February 202675%12
March 202684%25
April 202644%16
May 202645%20
Departures on time
59%
Diverted
0%
Flights flown
176
Months covered
12

Same route, other flights

Keep nerding

Based on 181 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.