Flight OddsDL399 BOS → ATL
Delta Air Lines · Boston, MA to Atlanta, GA · 248 flights observed, 2025-07-01 to 2026-06-30 · 946 mi
DL399 covers more than one route in the data window — the stats below are for BOS → ATL, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
70%
Median delay
-6 min
90th percentile
+74 min
Cancellation rate
1%
How often is DL399 on time?
Across 248 flights on BOS → ATL from 2025-07-01 to 2026-06-30, DL399 arrived within 15 minutes of schedule 70% of the time. The median arrival delay was -6 min, and the worst 10% of flights arrived +74 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 | 172 | 70% |
| 16-30 min | 16 | 7% |
| 31-60 min | 24 | 10% |
| 61-120 min | 22 | 9% |
| 2+ hrs | 10 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 30 | 67% | +20 min |
| 2025-08 | 30 | 73% | +0 min |
| 2025-09 | 30 | 67% | +23 min |
| 2025-10 | 31 | 61% | +27 min |
| 2025-11 | 30 | 77% | +5 min |
| 2025-12 | 18 | 78% | +4 min |
| 2026-04 | 18 | 61% | +24 min |
| 2026-05 | 30 | 73% | +8 min |
| 2026-06 | 27 | 78% | +1 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 36 | 67% |
| Tue | 37 | 68% |
| Wed | 35 | 74% |
| Thu | 36 | 61% |
| Fri | 35 | 80% |
| Sat | 32 | 75% |
| Sun | 33 | 70% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…