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Flight Reliability

F9 1517 · Frontier Airlines

Philadelphia → Raleigh–Durham (PHL–RDU)

81
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
3 min
Average arrival delay
1.8%
Cancelled
12 min early
Median arrival delay

Based on 282 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

F9 1517 departing between 12–3 PM arrived on time 83% of the time, versus 60% between 6–9 PM.

Mondays have been rough.

F9 1517 arrived on time 92% of the time on Wednesdays and just 74% on Mondays. That gap is worth planning around.

A bit ahead of the PHL–RDU route.

F9 1517 arrived on time 81% of the time, versus 76% across the PHL–RDU route.

Better than the Frontier Airlines network average.

F9 1517 arrived on time 81% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon74%(39 flights)
  • Tue81%(32 flights)
  • Wed92%(36 flights)
  • Thu86%(43 flights)
  • Fri77%(43 flights)
  • Sat81%(37 flights)
  • Sun75%(47 flights)
On-time by departure window
  • 9 AM–12 PM80%(94 flights)
  • 12–3 PM83%(164 flights)
  • 3–6 PM—(8 flights)
  • 6–9 PM60%(10 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
95%
May

Jun 73% → May 95% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%30
July 202590%31
August 202584%31
September 202583%30
October 202587%31
November 202573%30
January 202685%20
February 202673%15
March 202680%10
April 202670%23
May 202695%19
Departures on time
79%
Diverted
0%
Flights flown
277
Months covered
12

Same route, other flights

Keep nerding

Based on 282 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.