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Flight Reliability

F9 4928 · Frontier Airlines

San Diego → Denver (SAN–DEN)

76
Usually Fine
WanderNerd Reliability Score
74%
Arrive within 15 minutes
11 min
Average arrival delay
1.4%
Cancelled
8 min early
Median arrival delay

Based on 221 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

F9 4928 departing between 9 AM–12 PM arrived on time 78% of the time, versus 57% between 3–6 PM.

Tuesdays have been rough.

F9 4928 arrived on time 81% of the time on Saturdays and just 63% on Tuesdays. That gap is worth planning around.

A bit behind the SAN–DEN route.

F9 4928 arrived on time 74% of the time, versus 79% across the SAN–DEN route.

Ticking up lately.

F9 4928 arrived on time 77% of the time over the last three months in the data, compared with 72% in the three months before that.

The breakdown

On-time by weekday
  • Mon75%(36 flights)
  • Tue63%(24 flights)
  • Wed79%(24 flights)
  • Thu74%(35 flights)
  • Fri68%(34 flights)
  • Sat81%(32 flights)
  • Sun79%(33 flights)
On-time by departure window
  • 6–9 AM75%(16 flights)
  • 9 AM–12 PM78%(113 flights)
  • 12–3 PM76%(58 flights)
  • 3–6 PM57%(30 flights)
  • 6–9 PM—(1 flights)
On-time trend by month
72%
Mar

Jun 53% → Mar 72% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202553%30
July 202586%29
August 202574%27
September 202588%17
October 202587%23
November 202577%13
December 202552%21
January 202679%19
February 202681%16
March 202672%18
Departures on time
76%
Diverted
0%
Flights flown
218
Months covered
11

Same route, other flights

Keep nerding

Based on 221 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.