Flight OddsDL2639 JFK → BOS
Delta Air Lines · New York, NY to Boston, MA · 349 flights observed, 2025-07-01 to 2026-06-30 · 187 mi
On-time arrival
70%
Median delay
-5 min
90th percentile
+82 min
Cancellation rate
3%
How often is DL2639 on time?
Across 349 flights on JFK → BOS from 2025-07-01 to 2026-06-30, DL2639 arrived within 15 minutes of schedule 70% of the time. The median arrival delay was -5 min, and the worst 10% of flights arrived +82 min or later. 3% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 235 | 70% |
| 16-30 min | 22 | 7% |
| 31-60 min | 26 | 8% |
| 61-120 min | 31 | 9% |
| 2+ hrs | 23 | 7% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 28 | 43% | +51 min |
| 2025-08 | 31 | 71% | +31 min |
| 2025-09 | 30 | 73% | +15 min |
| 2025-10 | 30 | 67% | +50 min |
| 2025-11 | 30 | 73% | +6 min |
| 2025-12 | 19 | 58% | +39 min |
| 2026-01 | 24 | 79% | +24 min |
| 2026-02 | 26 | 69% | +12 min |
| 2026-03 | 30 | 87% | +8 min |
| 2026-04 | 30 | 67% | +7 min |
| 2026-05 | 30 | 77% | +6 min |
| 2026-06 | 29 | 69% | +5 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 47 | 72% |
| Tue | 49 | 71% |
| Wed | 49 | 76% |
| Thu | 47 | 57% |
| Fri | 50 | 74% |
| Sat | 49 | 65% |
| Sun | 46 | 72% |
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…