Flight Reliability
F9 3545 · Frontier Airlines
New York → San Juan (JFK–SJU)
17
Bring Snacks
WanderNerd Reliability Score
- 55%
- Arrive within 15 minutes
- 48 min
- Average arrival delay
- 5.3%
- Cancelled
- 8 min
- Median arrival delay
Based on 227 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
F9 3545 departing between 12–3 PM arrived on time 63% of the time, versus 50% between 9 AM–12 PM.
Sunday scaries are real for this one.
F9 3545 arrived on time 73% of the time on Fridays and just 46% on Sundays. That gap is worth planning around.
Well behind the JFK–SJU route.
F9 3545 arrived on time 55% of the time, versus 72% across the JFK–SJU route.
Well behind the Frontier Airlines network.
F9 3545 arrived on time 55% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon47%(30 flights)
- Tue53%(30 flights)
- Wed58%(33 flights)
- Thu47%(32 flights)
- Fri73%(30 flights)
- Sat59%(29 flights)
- Sun46%(28 flights)
- 9 AM–12 PM50%(119 flights)
- 12–3 PM63%(86 flights)
- 3–6 PM—(7 flights)
78%
Feb
Jun 48% → Feb 78% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 48% | 25 |
| July 2025 | 45% | 29 |
| August 2025 | 44% | 18 |
| October 2025 | 42% | 24 |
| November 2025 | 48% | 29 |
| December 2025 | 56% | 27 |
| January 2026 | 69% | 29 |
| February 2026 | 78% | 27 |
- Departures on time
- 66%
- Diverted
- 1.3%
- Flights flown
- 212
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 227 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.