Flight Reliability
F9 4140 · Frontier Airlines
Cleveland → San Juan (CLE–SJU)
65
Usually Fine
WanderNerd Reliability Score
- 69%
- Arrive within 15 minutes
- 8 min
- Average arrival delay
- 3.1%
- Cancelled
- 5 min early
- Median arrival delay
Based on 64 historical flights. Data through May 2026.
What the data says
The 6–9 AM departure wins.
F9 4140 departing between 6–9 AM arrived on time 95% of the time, versus 50% between 9 AM–12 PM.
Mondays have been rough.
F9 4140 arrived on time 70% of the time on Sundays and just 40% on Mondays. That gap is worth planning around.
A bit ahead of the CLE–SJU route.
F9 4140 arrived on time 69% of the time, versus 63% across the CLE–SJU route.
A bit behind the Frontier Airlines network.
F9 4140 arrived on time 69% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon40%(10 flights)
- Tue—(8 flights)
- Wed—(8 flights)
- Thu—(9 flights)
- Fri—(8 flights)
- Sat—(9 flights)
- Sun70%(10 flights)
- 6–9 AM95%(19 flights)
- 9 AM–12 PM50%(26 flights)
- 6–9 PM71%(17 flights)
92%
Dec
Jul 82% → Dec 92% on time
| Month | On-time percentage | Flights |
|---|---|---|
| July 2025 | 82% | 27 |
| August 2025 | 50% | 18 |
| December 2025 | 92% | 13 |
- Departures on time
- 74%
- Diverted
- 0%
- Flights flown
- 62
- Months covered
- 4
Same route, other flights
Keep nerding
Based on 64 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.