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Flight Reliability

F9 1504 · Frontier Airlines

San Francisco → Salt Lake City (SFO–SLC)

68
Usually Fine
WanderNerd Reliability Score
68%
Arrive within 15 minutes
22 min
Average arrival delay
0.7%
Cancelled
0 min
Median arrival delay

Based on 140 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

F9 1504 departing between 9 AM–12 PM arrived on time 94% of the time, versus 42% between 12–3 PM.

Mondays have been rough.

F9 1504 arrived on time 76% of the time on Sundays and just 57% on Mondays. That gap is worth planning around.

Lagging the SFO–SLC route.

F9 1504 arrived on time 68% of the time, versus 79% across the SFO–SLC route.

A bit behind the Frontier Airlines network.

F9 1504 arrived on time 68% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon57%(28 flights)
  • Tue70%(10 flights)
  • Wed—(4 flights)
  • Thu61%(28 flights)
  • Fri75%(28 flights)
  • Sat—(4 flights)
  • Sun76%(37 flights)
On-time by departure window
  • 6–9 AM—(3 flights)
  • 9 AM–12 PM94%(17 flights)
  • 12–3 PM42%(12 flights)
  • 3–6 PM64%(72 flights)
  • 6–9 PM71%(35 flights)
On-time trend by month
65%
May

Jun 73% → May 65% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%11
July 202557%14
August 202557%14
September 202588%17
October 202565%17
December 202546%11
March 2026100%12
April 202660%10
May 202665%23
Departures on time
69%
Diverted
0%
Flights flown
139
Months covered
11

Same route, other flights

Keep nerding

Based on 140 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.