Flight OddsDL1015 IAD → SEA
Delta Air Lines · Washington, DC to Seattle, WA · 349 flights observed, 2025-07-01 to 2026-06-30 · 2,305 mi
DL1015 covers more than one route in the data window — the stats below are for IAD → SEA, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
79%
Median delay
-6 min
90th percentile
+47 min
Cancellation rate
1%
How often is DL1015 on time?
Across 349 flights on IAD → SEA from 2025-07-01 to 2026-06-30, DL1015 arrived within 15 minutes of schedule 79% of the time. The median arrival delay was -6 min, and the worst 10% of flights arrived +47 min or later. 1% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 272 | 79% |
| 16-30 min | 25 | 7% |
| 31-60 min | 21 | 6% |
| 61-120 min | 10 | 3% |
| 2+ hrs | 16 | 5% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 90% | +3 min |
| 2025-08 | 31 | 87% | +21 min |
| 2025-09 | 30 | 90% | -17 min |
| 2025-10 | 31 | 87% | -1 min |
| 2025-11 | 30 | 73% | +25 min |
| 2025-12 | 19 | 47% | +38 min |
| 2026-01 | 26 | 69% | +44 min |
| 2026-02 | 27 | 78% | +7 min |
| 2026-03 | 29 | 45% | +35 min |
| 2026-04 | 29 | 93% | -11 min |
| 2026-05 | 31 | 94% | +2 min |
| 2026-06 | 30 | 80% | +7 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 49 | 92% |
| Tue | 51 | 75% |
| Wed | 50 | 78% |
| Thu | 50 | 68% |
| Fri | 49 | 84% |
| Sat | 47 | 81% |
| Sun | 48 | 77% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…