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Flight Reliability

F9 3861 · Frontier Airlines

Denver → Salt Lake City (DEN–SLC)

100
Nerd Approved
WanderNerd Reliability Score
94%
Arrive within 15 minutes
7 min early
Average arrival delay
0%
Cancelled
12 min early
Median arrival delay

Based on 213 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

F9 3861 departing between 6–9 AM arrived on time 96% of the time, versus 60% between 3–6 PM.

Saturdays have been rough.

F9 3861 arrived on time 100% of the time on Mondays and just 81% on Saturdays. That gap is worth planning around.

Well ahead of the DEN–SLC route.

F9 3861 arrived on time 94% of the time, versus 78% across the DEN–SLC route.

Well ahead of the Frontier Airlines network.

F9 3861 arrived on time 94% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon100%(43 flights)
  • Tue93%(14 flights)
  • Wed92%(12 flights)
  • Thu97%(33 flights)
  • Fri93%(42 flights)
  • Sat81%(26 flights)
  • Sun98%(43 flights)
On-time by departure window
  • 6–9 AM96%(199 flights)
  • 9 AM–12 PM—(1 flights)
  • 12–3 PM—(3 flights)
  • 3–6 PM60%(10 flights)
On-time trend by month
86%
May

Jun 80% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%20
July 202591%21
August 202595%21
September 2025100%13
October 2025100%17
November 2025100%19
December 2025100%13
March 202693%28
April 2026100%24
May 202686%21
Departures on time
93%
Diverted
0%
Flights flown
213
Months covered
12

Same route, other flights

Keep nerding

Based on 213 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.