Flight OddsDL1780 BOS → SJU
Delta Air Lines · Boston, MA to San Juan, PR · 365 flights observed, 2025-07-01 to 2026-06-30 · 1,674 mi
DL1780 covers more than one route in the data window — the stats below are for BOS → SJU, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
79%
Median delay
-4 min
90th percentile
+33 min
Cancellation rate
1%
How often is DL1780 on time?
Across 365 flights on BOS → SJU from 2025-07-01 to 2026-06-30, DL1780 arrived within 15 minutes of schedule 79% of the time. The median arrival delay was -4 min, and the worst 10% of flights arrived +33 min or later. 1% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 285 | 79% |
| 16-30 min | 35 | 10% |
| 31-60 min | 25 | 7% |
| 61-120 min | 10 | 3% |
| 2+ hrs | 6 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 97% | -5 min |
| 2025-08 | 31 | 90% | 0 min |
| 2025-09 | 30 | 70% | +10 min |
| 2025-10 | 31 | 71% | +6 min |
| 2025-11 | 30 | 80% | -2 min |
| 2025-12 | 31 | 74% | +11 min |
| 2026-01 | 28 | 71% | +17 min |
| 2026-02 | 27 | 67% | +21 min |
| 2026-03 | 31 | 77% | +3 min |
| 2026-04 | 30 | 77% | +4 min |
| 2026-05 | 31 | 87% | -1 min |
| 2026-06 | 30 | 83% | +1 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 50 | 76% |
| Tue | 53 | 81% |
| Wed | 51 | 80% |
| Thu | 52 | 75% |
| Fri | 52 | 83% |
| Sat | 51 | 84% |
| Sun | 52 | 73% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…