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Flight Reliability

F9 1203 · Frontier Airlines

Philadelphia → Miami (PHL–MIA)

54
A Little Dicey
WanderNerd Reliability Score
62%
Arrive within 15 minutes
21 min
Average arrival delay
2.6%
Cancelled
1 min
Median arrival delay

Based on 228 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

F9 1203 departing between 6–9 PM arrived on time 68% of the time, versus 53% between 12–3 PM.

Saturdays have been rough.

F9 1203 arrived on time 83% of the time on Wednesdays and just 58% on Saturdays. That gap is worth planning around.

Lagging the PHL–MIA route.

F9 1203 arrived on time 62% of the time, versus 77% across the PHL–MIA route.

Lagging the Frontier Airlines network.

F9 1203 arrived on time 62% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon60%(47 flights)
  • Tue71%(17 flights)
  • Wed83%(12 flights)
  • Thu62%(37 flights)
  • Fri63%(32 flights)
  • Sat58%(33 flights)
  • Sun59%(44 flights)
On-time by departure window
  • 3–6 AM—(3 flights)
  • 6–9 AM—(8 flights)
  • 9 AM–12 PM—(4 flights)
  • 12–3 PM53%(19 flights)
  • 3–6 PM59%(126 flights)
  • 6–9 PM68%(62 flights)
On-time trend by month
74%
May

Jun 23% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202523%13
July 202535%17
August 202575%20
September 202562%13
October 202565%20
November 202572%18
December 202564%11
January 202653%15
February 202667%24
March 202670%27
April 202659%17
May 202674%27
Departures on time
63%
Diverted
0%
Flights flown
222
Months covered
12

Same route, other flights

Keep nerding

Based on 228 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.