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Flight Reliability

F9 4158 · Frontier Airlines

San Francisco → Las Vegas (SFO–LAS)

78
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
15 min
Average arrival delay
0.7%
Cancelled
11 min early
Median arrival delay

Based on 294 historical flights. Data through May 2026.

What the data says

The 3–6 AM departure wins.

F9 4158 departing between 3–6 AM arrived on time 92% of the time, versus 49% between 9 AM–12 PM.

Thursdays have been rough.

F9 4158 arrived on time 83% of the time on Wednesdays and just 65% on Thursdays. That gap is worth planning around.

Recent months have been rougher.

F9 4158 arrived on time 45% of the time over the last three months in the data, compared with 70% in the three months before that.

The breakdown

On-time by weekday
  • Mon79%(47 flights)
  • Tue70%(30 flights)
  • Wed83%(30 flights)
  • Thu65%(43 flights)
  • Fri78%(49 flights)
  • Sat82%(44 flights)
  • Sun71%(49 flights)
On-time by departure window
  • 3–6 AM92%(98 flights)
  • 6–9 AM82%(103 flights)
  • 9 AM–12 PM49%(84 flights)
  • 12–3 PM—(4 flights)
  • 6–9 PM—(3 flights)
On-time trend by month
16%
May

Jun 87% → May 16% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%30
July 202593%30
August 202581%31
September 202593%30
October 202594%31
November 202584%25
December 202590%19
January 202665%17
February 202656%18
March 202677%17
April 202642%19
May 202616%25
Departures on time
75%
Diverted
0%
Flights flown
292
Months covered
12

Same route, other flights

Keep nerding

Based on 294 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.