Flight OddsNK309 SJU → BOS
Spirit Airlines · San Juan, PR to Boston, MA · 21 flights observed, 2025-12-18 to 2026-01-07 · 1,674 mi
NK309 covers more than one route in the data window — the stats below are for SJU → BOS, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
44%
Median delay
+20 min
90th percentile
+154 min
Cancellation rate
10%
How often is NK309 on time?
Across 21 flights on SJU → BOS from 2025-12-18 to 2026-01-07, NK309 arrived within 15 minutes of schedule 44% of the time. The median arrival delay was +20 min, and the worst 10% of flights arrived +154 min or later. 10% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 8 | 44% |
| 16-30 min | 3 | 17% |
| 31-60 min | 2 | 11% |
| 61-120 min | 2 | 11% |
| 2+ hrs | 3 | 17% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-12 | 13 | 54% | +19 min |
| 2026-01 | 5 | 20% | +87 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 3 | 33% |
| Tue | 3 | 67% |
| Wed | 3 | 67% |
| Thu | 2 | 50% |
| Fri | 2 | 50% |
| Sat | 2 | 0% |
| Sun | 3 | 33% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…