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Flight Reliability

F9 3339 · Frontier Airlines

Philadelphia → Denver (PHL–DEN)

64
A Little Dicey
WanderNerd Reliability Score
71%
Arrive within 15 minutes
23 min
Average arrival delay
1.9%
Cancelled
4 min early
Median arrival delay

Based on 257 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

F9 3339 departing between 6–9 AM arrived on time 80% of the time, versus 56% between 6–9 PM.

Sunday scaries are real for this one.

F9 3339 arrived on time 79% of the time on Saturdays and just 61% on Sundays. That gap is worth planning around.

A bit behind the PHL–DEN route.

F9 3339 arrived on time 71% of the time, versus 77% across the PHL–DEN route.

Recent months have been rougher.

F9 3339 arrived on time 58% of the time over the last three months in the data, compared with 75% in the three months before that.

The breakdown

On-time by weekday
  • Mon71%(48 flights)
  • Tue70%(20 flights)
  • Wed76%(21 flights)
  • Thu71%(45 flights)
  • Fri68%(47 flights)
  • Sat79%(38 flights)
  • Sun61%(33 flights)
On-time by departure window
  • 6–9 AM80%(143 flights)
  • 12–3 PM—(2 flights)
  • 3–6 PM73%(11 flights)
  • 6–9 PM56%(96 flights)
On-time trend by month
71%
May

Jun 72% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%29
July 202577%31
August 202584%25
September 202577%17
October 202594%18
November 202586%21
December 202544%16
March 202647%17
April 202655%29
May 202671%31
Departures on time
66%
Diverted
0%
Flights flown
252
Months covered
12

Same route, other flights

Keep nerding

Based on 257 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.