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Flight Reliability

F9 1225 · Frontier Airlines

San Juan → Raleigh–Durham (SJU–RDU)

72
Usually Fine
WanderNerd Reliability Score
74%
Arrive within 15 minutes
10 min
Average arrival delay
2.4%
Cancelled
3 min early
Median arrival delay

Based on 123 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

F9 1225 departing between 12–3 PM arrived on time 100% of the time, versus 62% between 3–6 PM.

Mondays have been rough.

F9 1225 arrived on time 86% of the time on Thursdays and just 52% on Mondays. That gap is worth planning around.

Lagging the SJU–RDU route.

F9 1225 arrived on time 74% of the time, versus 84% across the SJU–RDU route.

Slipping a little lately.

F9 1225 arrived on time 73% of the time over the last three months in the data, compared with 79% in the three months before that.

The breakdown

On-time by weekday
  • Mon52%(25 flights)
  • Tue—(8 flights)
  • Wed83%(12 flights)
  • Thu86%(14 flights)
  • Fri85%(27 flights)
  • Sat61%(18 flights)
  • Sun75%(16 flights)
On-time by departure window
  • 6–9 AM94%(16 flights)
  • 9 AM–12 PM76%(21 flights)
  • 12–3 PM100%(17 flights)
  • 3–6 PM62%(66 flights)
On-time trend by month
93%
May

Jun 71% → May 93% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%14
July 202565%17
August 202570%10
November 202573%11
December 202594%17
March 202657%14
April 202670%10
May 202693%14
Departures on time
75%
Diverted
0%
Flights flown
120
Months covered
10

Same route, other flights

Keep nerding

Based on 123 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.