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Flight Reliability

F9 1204 · Frontier Airlines

Miami → Philadelphia (MIA–PHL)

69
Usually Fine
WanderNerd Reliability Score
71%
Arrive within 15 minutes
14 min
Average arrival delay
1.9%
Cancelled
5 min early
Median arrival delay

Based on 155 historical flights. Data through May 2026.

What the data says

Sunday scaries are real for this one.

F9 1204 arrived on time 96% of the time on Fridays and just 57% on Sundays. That gap is worth planning around.

A bit behind the MIA–PHL route.

F9 1204 arrived on time 71% of the time, versus 76% across the MIA–PHL route.

Recent months have been rougher.

F9 1204 arrived on time 78% of the time over the last three months in the data, compared with 86% in the three months before that.

The breakdown

On-time by weekday
  • Mon74%(27 flights)
  • Tue—(9 flights)
  • Wed—(4 flights)
  • Thu69%(29 flights)
  • Fri96%(22 flights)
  • Sat69%(26 flights)
  • Sun57%(35 flights)
On-time by departure window
  • 9 AM–12 PM—(2 flights)
  • 12–3 PM—(3 flights)
  • 3–6 PM—(9 flights)
  • 6–9 PM—(6 flights)
  • 9 PM–12 AM68%(132 flights)
On-time trend by month
93%
May

Jun 50% → May 93% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202550%14
July 202553%17
August 202580%20
September 202592%13
October 202586%14
November 202585%13
March 202655%20
May 202693%14
Departures on time
66%
Diverted
0%
Flights flown
152
Months covered
12

Same route, other flights

Keep nerding

Based on 155 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.