Flight OddsDL400 SFO → BOS
Delta Air Lines · San Francisco, CA to Boston, MA · 364 flights observed, 2025-07-01 to 2026-06-30 · 2,704 mi
On-time arrival
90%
Median delay
-11 min
90th percentile
+15 min
Cancellation rate
2%
How often is DL400 on time?
Across 364 flights on SFO → BOS from 2025-07-01 to 2026-06-30, DL400 arrived within 15 minutes of schedule 90% of the time. The median arrival delay was -11 min, and the worst 10% of flights arrived +15 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 | 321 | 90% |
| 16-30 min | 18 | 5% |
| 31-60 min | 7 | 2% |
| 61-120 min | 4 | 1% |
| 2+ hrs | 7 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 97% | -14 min |
| 2025-08 | 31 | 94% | -3 min |
| 2025-09 | 30 | 73% | +24 min |
| 2025-10 | 29 | 72% | +25 min |
| 2025-11 | 29 | 86% | +1 min |
| 2025-12 | 31 | 97% | -15 min |
| 2026-01 | 28 | 96% | +2 min |
| 2026-02 | 27 | 89% | -19 min |
| 2026-03 | 31 | 100% | -18 min |
| 2026-04 | 30 | 93% | -2 min |
| 2026-05 | 31 | 94% | -3 min |
| 2026-06 | 29 | 86% | -5 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 50 | 90% |
| Tue | 52 | 92% |
| Wed | 52 | 87% |
| Thu | 50 | 90% |
| Fri | 51 | 94% |
| Sat | 51 | 90% |
| Sun | 51 | 86% |
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…