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Flight Reliability

F9 1819 · Frontier Airlines

Denver → Phoenix (DEN–PHX)

85
Pretty Reliable
WanderNerd Reliability Score
83%
Arrive within 15 minutes
2 min
Average arrival delay
1.5%
Cancelled
11 min early
Median arrival delay

Based on 134 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 6–9 AM arrived on time 87% of the time, against 82% between 9 AM–12 PM.

Saturdays have been rough.

F9 1819 arrived on time 95% of the time on Mondays and just 69% on Saturdays. That gap is worth planning around.

Better than the DEN–PHX route average.

F9 1819 arrived on time 83% of the time, versus 76% across the DEN–PHX route.

Better than the Frontier Airlines network average.

F9 1819 arrived on time 83% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon95%(21 flights)
  • Tue82%(17 flights)
  • Wed80%(15 flights)
  • Thu79%(24 flights)
  • Fri78%(23 flights)
  • Sat69%(13 flights)
  • Sun95%(19 flights)
On-time by departure window
  • 6–9 AM87%(63 flights)
  • 9 AM–12 PM82%(61 flights)
  • 12–3 PM—(2 flights)
  • 3–6 PM—(6 flights)
On-time trend by month
63%
Mar

Sep 88% → Mar 63% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
September 202588%17
October 202589%18
November 202581%16
January 202681%26
February 202693%28
March 202663%19
Departures on time
83%
Diverted
0%
Flights flown
132
Months covered
9

Same route, other flights

Keep nerding

Based on 134 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.