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Flight Reliability

F9 1815 · Frontier Airlines

Austin → Denver (AUS–DEN)

92
Nerd Approved
WanderNerd Reliability Score
88%
Arrive within 15 minutes
3 min
Average arrival delay
0.6%
Cancelled
10 min early
Median arrival delay

Based on 317 historical flights. Data through May 2026.

What the data says

Mondays have been rough.

F9 1815 arrived on time 93% of the time on Tuesdays and just 76% on Mondays. That gap is worth planning around.

Better than the AUS–DEN route average.

F9 1815 arrived on time 88% of the time, versus 79% across the AUS–DEN route.

Better than the Frontier Airlines network average.

F9 1815 arrived on time 88% of the time, versus 73% across the Frontier Airlines network.

Ticking up lately.

F9 1815 arrived on time 91% of the time over the last three months in the data, compared with 87% in the three months before that.

The breakdown

On-time by weekday
  • Mon76%(46 flights)
  • Tue93%(45 flights)
  • Wed93%(45 flights)
  • Thu87%(45 flights)
  • Fri93%(44 flights)
  • Sat77%(44 flights)
  • Sun93%(45 flights)
On-time by departure window
  • 6–9 AM88%(300 flights)
  • 9 AM–12 PM86%(14 flights)
On-time trend by month
92%
Apr

Jun 87% → Apr 92% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%30
July 202577%30
August 202584%31
September 202593%30
October 202594%31
November 202597%30
December 202584%31
January 202679%29
February 202686%28
March 202694%31
April 202692%13
Departures on time
89%
Diverted
0.3%
Flights flown
314
Months covered
11

Same route, other flights

Keep nerding

Based on 317 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.