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Flight Reliability

F9 2108 · Frontier Airlines

Denver → FSD (DEN–FSD)

80
Pretty Reliable
WanderNerd Reliability Score
72%
Arrive within 15 minutes
11 min
Average arrival delay
0%
Cancelled
7 min early
Median arrival delay

Based on 165 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

F9 2108 departing between 12–3 PM arrived on time 93% of the time, versus 57% between 3–6 PM.

Mondays have been rough.

F9 2108 arrived on time 82% of the time on Thursdays and just 56% on Mondays. That gap is worth planning around.

Lagging the DEN–FSD route.

F9 2108 arrived on time 72% of the time, versus 81% across the DEN–FSD route.

It basically never cancels.

Out of 165 scheduled flights, only 0.0% were cancelled.

The breakdown

On-time by weekday
  • Mon56%(45 flights)
  • Tue—(0 flights)
  • Wed69%(16 flights)
  • Thu82%(27 flights)
  • Fri78%(45 flights)
  • Sat—(0 flights)
  • Sun81%(32 flights)
On-time by departure window
  • 9 AM–12 PM81%(80 flights)
  • 12–3 PM93%(15 flights)
  • 3–6 PM57%(70 flights)
On-time trend by month
77%
May

Jun 60% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%20
July 202573%22
August 202568%22
September 202585%13
October 202582%17
November 202579%14
February 202690%10
March 202691%11
May 202677%13
Departures on time
75%
Diverted
0%
Flights flown
165
Months covered
12

Same route, other flights

Keep nerding

Based on 165 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.