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Flight Reliability

F9 4593 · Frontier Airlines

Los Angeles → San Francisco (LAX–SFO)

53
A Little Dicey
WanderNerd Reliability Score
58%
Arrive within 15 minutes
32 min
Average arrival delay
0.6%
Cancelled
9 min
Median arrival delay

Based on 171 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 9 AM–12 PM arrived on time 60% of the time, against 55% between 6–9 PM.

Sunday scaries are real for this one.

F9 4593 arrived on time 79% of the time on Tuesdays and just 45% on Sundays. That gap is worth planning around.

Lagging the LAX–SFO route.

F9 4593 arrived on time 58% of the time, versus 69% across the LAX–SFO route.

Lagging the Frontier Airlines network.

F9 4593 arrived on time 58% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon68%(31 flights)
  • Tue79%(14 flights)
  • Wed69%(13 flights)
  • Thu53%(30 flights)
  • Fri54%(26 flights)
  • Sat56%(25 flights)
  • Sun45%(31 flights)
On-time by departure window
  • 6–9 AM—(5 flights)
  • 9 AM–12 PM60%(60 flights)
  • 12–3 PM—(9 flights)
  • 3–6 PM—(7 flights)
  • 6–9 PM55%(89 flights)
On-time trend by month
27%
May

Jun 54% → May 27% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202554%26
July 202561%31
August 202563%27
September 202548%21
October 202564%28
November 202567%15
May 202627%15
Departures on time
58%
Diverted
0%
Flights flown
170
Months covered
10

Same route, other flights

Keep nerding

Based on 171 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.