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Flight Reliability

F9 3393 · Frontier Airlines

Salt Lake City → San Francisco (SLC–SFO)

66
Usually Fine
WanderNerd Reliability Score
69%
Arrive within 15 minutes
21 min
Average arrival delay
1.3%
Cancelled
5 min early
Median arrival delay

Based on 159 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

F9 3393 departing between 9 AM–12 PM arrived on time 92% of the time, versus 53% between 6–9 PM.

Thursdays have been rough.

F9 3393 arrived on time 80% of the time on Tuesdays and just 59% on Thursdays. That gap is worth planning around.

A bit behind the SLC–SFO route.

F9 3393 arrived on time 69% of the time, versus 73% across the SLC–SFO route.

A bit behind the Frontier Airlines network.

F9 3393 arrived on time 69% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon68%(34 flights)
  • Tue80%(10 flights)
  • Wed—(4 flights)
  • Thu59%(29 flights)
  • Fri74%(35 flights)
  • Sat—(4 flights)
  • Sun66%(41 flights)
On-time by departure window
  • 9 AM–12 PM92%(12 flights)
  • 12–3 PM79%(57 flights)
  • 3–6 PM67%(39 flights)
  • 6–9 PM53%(49 flights)
On-time trend by month
61%
May

Jun 91% → May 61% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202591%11
July 202564%14
August 202586%14
September 202547%17
October 202553%17
December 202590%10
February 202690%10
March 202664%14
May 202661%23
Departures on time
69%
Diverted
0%
Flights flown
157
Months covered
12

Same route, other flights

Keep nerding

Based on 159 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.