Flight Reliability
NK 655 · Spirit Airlines
Philadelphia → San Juan (PHL–SJU)91% of its flights flew this route. The rest (SJU–PHL, PHL–MIA) are included in these numbers.
6
Bring Snacks
WanderNerd Reliability Score
- 51%
- Arrive within 15 minutes
- 27 min
- Average arrival delay
- 11.3%
- Cancelled
- 13 min
- Median arrival delay
Based on 97 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
NK 655 arrived on time 69% of the time on Saturdays and just 20% on Sundays. That gap is worth planning around.
Lagging the PHL–SJU route.
NK 655 arrived on time 51% of the time, versus 63% across the PHL–SJU route.
Well behind the Spirit Airlines network.
NK 655 arrived on time 51% of the time, versus 74% across the Spirit Airlines network.
The breakdown
- Mon46%(13 flights)
- Tue64%(11 flights)
- Wed55%(11 flights)
- Thu31%(13 flights)
- Fri67%(15 flights)
- Sat69%(13 flights)
- Sun20%(10 flights)
- 3–6 PM—(8 flights)
- 6–9 PM47%(78 flights)
30%
Apr
Jan 69% → Apr 30% on time
| Month | On-time percentage | Flights |
|---|---|---|
| January 2026 | 69% | 16 |
| February 2026 | 46% | 24 |
| March 2026 | 43% | 28 |
| April 2026 | 30% | 10 |
- Departures on time
- 49%
- Diverted
- 0%
- Flights flown
- 86
- Months covered
- 6
Same route, other flights
Keep nerding
Based on 97 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.