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Flight Reliability

F9 2817 · Frontier Airlines

Denver → San Diego (DEN–SAN)

89
Pretty Reliable
WanderNerd Reliability Score
85%
Arrive within 15 minutes
2 min early
Average arrival delay
0.9%
Cancelled
11 min early
Median arrival delay

Based on 228 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

F9 2817 departing between 12–3 PM arrived on time 100% of the time, versus 81% between 6–9 PM.

Tuesday is the weak spot.

F9 2817 arrived on time 91% of the time on Mondays. On Tuesdays: 79%.

Better than the DEN–SAN route average.

F9 2817 arrived on time 85% of the time, versus 76% across the DEN–SAN route.

Better than the Frontier Airlines network average.

F9 2817 arrived on time 85% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon91%(35 flights)
  • Tue79%(24 flights)
  • Wed83%(23 flights)
  • Thu84%(37 flights)
  • Fri85%(34 flights)
  • Sat89%(36 flights)
  • Sun81%(37 flights)
On-time by departure window
  • 6–9 AM88%(81 flights)
  • 9 AM–12 PM82%(95 flights)
  • 12–3 PM100%(10 flights)
  • 3–6 PM—(3 flights)
  • 6–9 PM81%(37 flights)
On-time trend by month
81%
Apr

Jun 87% → Apr 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%30
July 202593%29
August 202582%27
September 202582%17
October 202583%23
November 202582%28
January 202692%13
February 202681%16
March 202683%23
April 202681%16
Departures on time
83%
Diverted
0%
Flights flown
226
Months covered
12

Same route, other flights

Keep nerding

Based on 228 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.