Flight OddsDL1239 SEA → SLC
Delta Air Lines · Seattle, WA to Salt Lake City, UT · 245 flights observed, 2025-07-03 to 2026-06-29 · 689 mi
On-time arrival
83%
Median delay
-10 min
90th percentile
+30 min
Cancellation rate
0%
How often is DL1239 on time?
Across 245 flights on SEA → SLC from 2025-07-03 to 2026-06-29, DL1239 arrived within 15 minutes of schedule 83% of the time. The median arrival delay was -10 min, and the worst 10% of flights arrived +30 min or later. 0% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 202 | 83% |
| 16-30 min | 17 | 7% |
| 31-60 min | 11 | 5% |
| 61-120 min | 9 | 4% |
| 2+ hrs | 5 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 16 | 88% | +3 min |
| 2025-08 | 14 | 79% | -1 min |
| 2025-09 | 12 | 92% | -4 min |
| 2025-10 | 15 | 100% | -9 min |
| 2025-11 | 14 | 93% | -11 min |
| 2025-12 | 21 | 81% | +7 min |
| 2026-01 | 31 | 81% | +3 min |
| 2026-02 | 24 | 88% | -2 min |
| 2026-03 | 26 | 92% | -9 min |
| 2026-04 | 26 | 77% | +10 min |
| 2026-05 | 26 | 69% | +4 min |
| 2026-06 | 19 | 68% | -1 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 48 | 85% |
| Tue | 25 | 92% |
| Wed | 25 | 80% |
| Thu | 46 | 85% |
| Fri | 44 | 73% |
| Sat | 10 | 80% |
| Sun | 46 | 85% |
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…