Flight profile · Delta Air Lines
DL1015
Washington (IAD) to Seattle (SEA) · scheduled 7:30 AM – 10:28 AM
How DL1015 performs
645 operations, 2024-06-07 to 2026-06-30.
DL1015 arrived on time 82.5% of the time, against 79.3% for all IAD → SEA flights — this specific departure is 3.2 percentage points better than the route as a whole. Against Delta Air Lines’s own flights on this route it is 3.9 points better.
Source: US DOT Bureau of Transportation Statistics · 645 operations between 2024-06-07 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL1015 | 82.5% | 0.78% | -11 min | 6.6% | 645 |
| Delta Air Lines on IAD → SEA | 78.6% | 0.97% | -8 min | 7.7% | 1,444 |
| All IAD → SEA flights | 79.3% | 1.14% | -7 min | 6.3% | 6,309 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-06-07 to 2026-06-30
Other routes DL1015 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| DTW→FLL Detroit to Fort Lauderdale | 2024-12-19 – 2026-01-04 | 34 | — |
| SAN→BOS San Diego to Boston | 2025-01-06 – 2025-03-08 | 62 | — |
| ATL→BDL Atlanta to Hartford | 2023-09-10 – 2024-06-06 | 95 | 92.6% |
| BDL→ATL Hartford to Atlanta | 2023-09-10 – 2024-06-06 | 82 | — |
| BHM→ATL Birmingham to Atlanta | 2024-01-08 – 2024-05-06 | 120 | 89.1% |
| SLC→CLT Salt Lake City to Charlotte | 2023-12-16 – 2023-12-30 | 13 | — |
| ATL→GSO Atlanta to Greensboro | 2023-12-07 – 2023-12-15 | 9 | — |
| GSO→ATL Greensboro to Atlanta | 2023-12-07 – 2023-12-15 | 9 | — |
| ATL→TYS Atlanta to Knoxville/Maryville | 2023-09-16 – 2023-10-07 | 4 | — |
| TYS→ATL Knoxville/Maryville to Atlanta | 2023-09-16 – 2023-10-07 | 4 | — |
| ORD→LGA Chicago to New York | 2023-07-02 – 2023-09-04 | 56 | — |
| LGA→ORD New York to Chicago | 2023-07-03 – 2023-09-04 | 54 | — |
Because the same number has served different journeys, the statistics above describe only the route DL1015 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 645 records of DL1015 operating IAD → SEA, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.