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Flight Reliability

F9 1499 · Frontier Airlines

Denver → Ontario (DEN–ONT)

72
Usually Fine
WanderNerd Reliability Score
69%
Arrive within 15 minutes
13 min
Average arrival delay
0.9%
Cancelled
2 min early
Median arrival delay

Based on 234 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

F9 1499 departing between 6–9 PM arrived on time 85% of the time, versus 66% between 9 PM–12 AM.

Mondays have been rough.

F9 1499 arrived on time 89% of the time on Wednesdays and just 58% on Mondays. That gap is worth planning around.

A bit behind the DEN–ONT route.

F9 1499 arrived on time 69% of the time, versus 75% across the DEN–ONT route.

A bit behind the Frontier Airlines network.

F9 1499 arrived on time 69% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon58%(38 flights)
  • Tue65%(26 flights)
  • Wed89%(26 flights)
  • Thu76%(37 flights)
  • Fri65%(37 flights)
  • Sat77%(30 flights)
  • Sun63%(38 flights)
On-time by departure window
  • 6–9 PM85%(39 flights)
  • 9 PM–12 AM66%(193 flights)
On-time trend by month
74%
Feb

Jun 52% → Feb 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202552%25
July 202557%30
August 202568%31
September 202583%30
October 202580%30
November 202580%30
December 202553%15
January 202663%19
February 202674%19
Departures on time
67%
Diverted
0%
Flights flown
232
Months covered
10

Same route, other flights

Keep nerding

Based on 234 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.