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Flight Reliability

F9 4306 · Frontier Airlines

San Francisco → San Diego (SFO–SAN)

56
A Little Dicey
WanderNerd Reliability Score
59%
Arrive within 15 minutes
23 min
Average arrival delay
1.2%
Cancelled
7 min
Median arrival delay

Based on 161 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

F9 4306 departing between 3–6 PM arrived on time 80% of the time, versus 57% between 12–3 PM.

Thursdays have been rough.

F9 4306 arrived on time 83% of the time on Saturdays and just 52% on Thursdays. That gap is worth planning around.

Lagging the SFO–SAN route.

F9 4306 arrived on time 59% of the time, versus 69% across the SFO–SAN route.

Lagging the Frontier Airlines network.

F9 4306 arrived on time 59% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon54%(35 flights)
  • Tue—(3 flights)
  • Wed—(3 flights)
  • Thu52%(31 flights)
  • Fri58%(31 flights)
  • Sat83%(23 flights)
  • Sun58%(33 flights)
On-time by departure window
  • 9 AM–12 PM61%(87 flights)
  • 12–3 PM57%(51 flights)
  • 3–6 PM80%(10 flights)
  • 6–9 PM—(2 flights)
  • 9 PM–12 AM—(9 flights)
On-time trend by month
50%
May

Jun 74% → May 50% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202574%19
July 202529%21
August 202548%21
October 202574%19
November 202585%20
December 202552%21
May 202650%14
Departures on time
69%
Diverted
0%
Flights flown
159
Months covered
10

Same route, other flights

Keep nerding

Based on 161 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.