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Flight Reliability

F9 3666 · Frontier Airlines

Sacramento → Denver (SMF–DEN)

88
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
3 min
Average arrival delay
0.6%
Cancelled
10 min early
Median arrival delay

Based on 163 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

F9 3666 departing between 9 AM–12 PM arrived on time 91% of the time, versus 53% between 3–6 PM.

Skip Thursday if you can.

F9 3666 arrived on time 90% of the time on Sundays. On Thursdays: 76%.

Better than the Frontier Airlines network average.

F9 3666 arrived on time 82% of the time, versus 73% across the Frontier Airlines network.

Trending in the right direction.

F9 3666 arrived on time 84% of the time over the last three months in the data, compared with 75% in the three months before that.

The breakdown

On-time by weekday
  • Mon82%(50 flights)
  • Tue—(2 flights)
  • Wed—(5 flights)
  • Thu76%(21 flights)
  • Fri77%(48 flights)
  • Sat—(7 flights)
  • Sun90%(29 flights)
On-time by departure window
  • 9 AM–12 PM91%(54 flights)
  • 12–3 PM82%(93 flights)
  • 3–6 PM53%(15 flights)
On-time trend by month
100%
May

Aug 85% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
August 202585%13
September 202571%17
October 2025100%14
November 202587%15
December 202560%15
January 202673%15
February 202692%12
March 202659%17
April 202692%13
May 2026100%16
Departures on time
79%
Diverted
0%
Flights flown
162
Months covered
12

Same route, other flights

Keep nerding

Based on 163 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.