Flight OddsDL859 BOS → SLC
Delta Air Lines · Boston, MA to Salt Lake City, UT · 365 flights observed, 2025-07-01 to 2026-06-30 · 2,105 mi
On-time arrival
89%
Median delay
-8 min
90th percentile
+17 min
Cancellation rate
2%
How often is DL859 on time?
Across 365 flights on BOS → SLC from 2025-07-01 to 2026-06-30, DL859 arrived within 15 minutes of schedule 89% of the time. The median arrival delay was -8 min, and the worst 10% of flights arrived +17 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 | 318 | 89% |
| 16-30 min | 25 | 7% |
| 31-60 min | 7 | 2% |
| 61-120 min | 3 | 1% |
| 2+ hrs | 5 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 97% | -10 min |
| 2025-08 | 30 | 97% | -12 min |
| 2025-09 | 30 | 100% | -15 min |
| 2025-10 | 31 | 94% | -13 min |
| 2025-11 | 30 | 90% | -10 min |
| 2025-12 | 31 | 81% | +10 min |
| 2026-01 | 28 | 68% | +1 min |
| 2026-02 | 26 | 81% | -10 min |
| 2026-03 | 31 | 94% | -2 min |
| 2026-04 | 30 | 90% | -5 min |
| 2026-05 | 30 | 90% | -1 min |
| 2026-06 | 30 | 83% | +8 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 50 | 92% |
| Tue | 50 | 92% |
| Wed | 50 | 92% |
| Thu | 52 | 88% |
| Fri | 52 | 90% |
| Sat | 52 | 79% |
| Sun | 52 | 88% |
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…