Flight OddsDL321 BOS → LAX
Delta Air Lines · Boston, MA to Los Angeles, CA · 275 flights observed, 2025-07-06 to 2026-06-26 · 2,611 mi
DL321 covers more than one route in the data window — the stats below are for BOS → LAX, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
69%
Median delay
+2 min
90th percentile
+71 min
Cancellation rate
2%
How often is DL321 on time?
Across 275 flights on BOS → LAX from 2025-07-06 to 2026-06-26, DL321 arrived within 15 minutes of schedule 69% of the time. The median arrival delay was +2 min, and the worst 10% of flights arrived +71 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 | 186 | 69% |
| 16-30 min | 25 | 9% |
| 31-60 min | 25 | 9% |
| 61-120 min | 16 | 6% |
| 2+ hrs | 16 | 6% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 19 | 63% | +14 min |
| 2025-08 | 17 | 82% | +8 min |
| 2025-09 | 17 | 47% | +37 min |
| 2025-10 | 22 | 45% | +62 min |
| 2025-11 | 20 | 75% | +10 min |
| 2025-12 | 8 | 63% | +19 min |
| 2026-01 | 28 | 89% | +20 min |
| 2026-02 | 27 | 63% | +11 min |
| 2026-03 | 30 | 80% | +46 min |
| 2026-04 | 30 | 70% | +9 min |
| 2026-05 | 27 | 67% | +14 min |
| 2026-06 | 23 | 74% | +19 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 43 | 67% |
| Tue | 36 | 75% |
| Wed | 41 | 73% |
| Thu | 41 | 61% |
| Fri | 42 | 76% |
| Sat | 22 | 77% |
| Sun | 43 | 60% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…