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Flight Reliability

F9 1901 · Frontier Airlines

Salt Lake City → San Diego (SLC–SAN)

87
Pretty Reliable
WanderNerd Reliability Score
85%
Arrive within 15 minutes
2 min early
Average arrival delay
1.5%
Cancelled
11 min early
Median arrival delay

Based on 137 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

F9 1901 departing between 6–9 AM arrived on time 100% of the time, versus 81% between 6–9 PM.

Skip Thursday if you can.

F9 1901 arrived on time 89% of the time on Sundays. On Thursdays: 77%.

Better than the Frontier Airlines network average.

F9 1901 arrived on time 85% of the time, versus 73% across the Frontier Airlines network.

Recent months have been rougher.

F9 1901 arrived on time 76% of the time over the last three months in the data, compared with 94% in the three months before that.

The breakdown

On-time by weekday
  • Mon86%(36 flights)
  • Tue—(2 flights)
  • Wed—(0 flights)
  • Thu77%(17 flights)
  • Fri86%(35 flights)
  • Sat—(0 flights)
  • Sun89%(45 flights)
On-time by departure window
  • 6–9 AM100%(21 flights)
  • 9 AM–12 PM83%(54 flights)
  • 12–3 PM—(4 flights)
  • 3–6 PM—(6 flights)
  • 6–9 PM81%(42 flights)
  • 9 PM–12 AM—(8 flights)
On-time trend by month
71%
Apr

Jul 92% → Apr 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
July 202592%12
August 2025100%14
September 2025100%13
October 202592%13
November 2025100%11
December 202591%11
January 202673%11
February 202683%12
April 202671%17
Departures on time
87%
Diverted
0%
Flights flown
135
Months covered
12

Same route, other flights

Keep nerding

Based on 137 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.