Flight OddsDL499 BOS → DEN
Delta Air Lines · Boston, MA to Denver, CO · 365 flights observed, 2025-07-01 to 2026-06-30 · 1,754 mi
DL499 covers more than one route in the data window — the stats below are for BOS → DEN, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
85%
Median delay
-6 min
90th percentile
+24 min
Cancellation rate
2%
How often is DL499 on time?
Across 365 flights on BOS → DEN from 2025-07-01 to 2026-06-30, DL499 arrived within 15 minutes of schedule 85% of the time. The median arrival delay was -6 min, and the worst 10% of flights arrived +24 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 | 305 | 85% |
| 16-30 min | 26 | 7% |
| 31-60 min | 17 | 5% |
| 61-120 min | 9 | 3% |
| 2+ hrs | 2 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 30 | 83% | -3 min |
| 2025-08 | 30 | 100% | -10 min |
| 2025-09 | 30 | 80% | -2 min |
| 2025-10 | 31 | 84% | -1 min |
| 2025-11 | 30 | 93% | -9 min |
| 2025-12 | 31 | 61% | +17 min |
| 2026-01 | 30 | 70% | +19 min |
| 2026-02 | 26 | 96% | -13 min |
| 2026-03 | 31 | 71% | +3 min |
| 2026-04 | 30 | 100% | -13 min |
| 2026-05 | 30 | 93% | -5 min |
| 2026-06 | 30 | 90% | +2 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 49 | 90% |
| Tue | 51 | 82% |
| Wed | 52 | 88% |
| Thu | 52 | 81% |
| Fri | 52 | 83% |
| Sat | 51 | 90% |
| Sun | 52 | 81% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…