Flight OddsDL1399 MIA → BOS
Delta Air Lines · Miami, FL to Boston, MA · 227 flights observed, 2025-07-01 to 2026-06-30 · 1,258 mi
DL1399 covers more than one route in the data window — the stats below are for MIA → BOS, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
73%
Median delay
-5 min
90th percentile
+65 min
Cancellation rate
1%
How often is DL1399 on time?
Across 227 flights on MIA → BOS from 2025-07-01 to 2026-06-30, DL1399 arrived within 15 minutes of schedule 73% of the time. The median arrival delay was -5 min, and the worst 10% of flights arrived +65 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 | 164 | 73% |
| 16-30 min | 14 | 6% |
| 31-60 min | 21 | 9% |
| 61-120 min | 14 | 6% |
| 2+ hrs | 11 | 5% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 30 | 73% | +4 min |
| 2025-08 | 31 | 90% | -1 min |
| 2025-09 | 29 | 72% | +15 min |
| 2025-10 | 31 | 45% | +47 min |
| 2025-11 | 29 | 72% | +17 min |
| 2025-12 | 19 | 74% | +2 min |
| 2026-05 | 25 | 76% | +10 min |
| 2026-06 | 30 | 83% | -2 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 32 | 69% |
| Tue | 33 | 85% |
| Wed | 32 | 81% |
| Thu | 33 | 64% |
| Fri | 33 | 64% |
| Sat | 30 | 73% |
| Sun | 31 | 77% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…