Flight OddsDL821 ATL → BOS
Delta Air Lines · Atlanta, GA to Boston, MA · 325 flights observed, 2025-07-06 to 2026-06-30 · 946 mi
On-time arrival
69%
Median delay
+2 min
90th percentile
+64 min
Cancellation rate
2%
How often is DL821 on time?
Across 325 flights on ATL → BOS from 2025-07-06 to 2026-06-30, DL821 arrived within 15 minutes of schedule 69% of the time. The median arrival delay was +2 min, and the worst 10% of flights arrived +64 min or later. 2% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 221 | 69% |
| 16-30 min | 33 | 10% |
| 31-60 min | 31 | 10% |
| 61-120 min | 23 | 7% |
| 2+ hrs | 12 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 18 | 28% | +44 min |
| 2025-08 | 16 | 69% | +9 min |
| 2025-09 | 20 | 65% | +27 min |
| 2025-10 | 30 | 60% | +19 min |
| 2025-11 | 28 | 75% | +19 min |
| 2025-12 | 31 | 71% | +16 min |
| 2026-01 | 29 | 86% | +1 min |
| 2026-02 | 26 | 73% | +13 min |
| 2026-03 | 31 | 71% | +13 min |
| 2026-04 | 30 | 73% | +10 min |
| 2026-05 | 31 | 65% | +10 min |
| 2026-06 | 30 | 77% | +10 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 48 | 67% |
| Tue | 42 | 76% |
| Wed | 41 | 71% |
| Thu | 47 | 66% |
| Fri | 49 | 71% |
| Sat | 46 | 76% |
| Sun | 47 | 57% |
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…