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Flight Reliability

F9 3801 · Frontier Airlines

Las Vegas → San Francisco (LAS–SFO)

66
Usually Fine
WanderNerd Reliability Score
67%
Arrive within 15 minutes
18 min
Average arrival delay
1.3%
Cancelled
3 min early
Median arrival delay

Based on 226 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

F9 3801 departing between 12–3 PM arrived on time 72% of the time, versus 55% between 9 AM–12 PM.

Sunday scaries are real for this one.

F9 3801 arrived on time 88% of the time on Wednesdays and just 54% on Sundays. That gap is worth planning around.

A bit behind the Frontier Airlines network.

F9 3801 arrived on time 67% of the time, versus 73% across the Frontier Airlines network.

Slipping a little lately.

F9 3801 arrived on time 67% of the time over the last three months in the data, compared with 72% in the three months before that.

The breakdown

On-time by weekday
  • Mon72%(39 flights)
  • Tue63%(19 flights)
  • Wed88%(16 flights)
  • Thu71%(38 flights)
  • Fri60%(42 flights)
  • Sat73%(30 flights)
  • Sun54%(39 flights)
On-time by departure window
  • 6–9 AM66%(44 flights)
  • 9 AM–12 PM55%(38 flights)
  • 12–3 PM72%(78 flights)
  • 3–6 PM68%(63 flights)
On-time trend by month
60%
May

Jul 46% → May 60% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
July 202546%11
August 202573%15
September 202565%17
October 202569%16
November 202567%18
December 202566%29
January 202671%21
February 202678%18
March 202685%13
April 202657%28
May 202660%30
Departures on time
66%
Diverted
0%
Flights flown
223
Months covered
12

Same route, other flights

Keep nerding

Based on 226 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.