Flight Reliability
F9 3377 · Frontier Airlines
San Juan → Miami (SJU–MIA)
73
Usually Fine
WanderNerd Reliability Score
- 74%
- Arrive within 15 minutes
- 16 min
- Average arrival delay
- 0.8%
- Cancelled
- 9 min early
- Median arrival delay
Based on 124 historical flights. Data through May 2026.
What the data says
Mondays have been rough.
F9 3377 arrived on time 88% of the time on Thursdays and just 61% on Mondays. That gap is worth planning around.
A bit behind the SJU–MIA route.
F9 3377 arrived on time 74% of the time, versus 78% across the SJU–MIA route.
Slipping a little lately.
F9 3377 arrived on time 77% of the time over the last three months in the data, compared with 81% in the three months before that.
The breakdown
- Mon61%(18 flights)
- Tue75%(16 flights)
- Wed80%(15 flights)
- Thu88%(17 flights)
- Fri67%(24 flights)
- Sat—(9 flights)
- Sun78%(23 flights)
- 3–6 PM—(6 flights)
- 6–9 PM76%(74 flights)
- 9 PM–12 AM74%(42 flights)
76%
May
Jun 73% → May 76% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 73% | 15 |
| July 2025 | 80% | 10 |
| August 2025 | 91% | 11 |
| October 2025 | 79% | 14 |
| November 2025 | 75% | 16 |
| May 2026 | 76% | 25 |
- Departures on time
- 73%
- Diverted
- 0.8%
- Flights flown
- 122
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 124 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.