Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
DL 1015 · Dulles (IAD) → Seattle (SEA)
Sold by Delta. Still flying: 56 of the last 56 days (Daily).
Arrives on time79%within 15 minutes, of 349 flights
Cancelled1.1%of scheduled flights
An hour or more late8%of flights that operated
When late, on average102 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Seattle is 3 h behind Dulles).
- Leaves IAD
- 07:00
- Arrives SEA
- 09:45
- Flight time
- 5h 45m
- Days flown, last 8 weeks
- 56 of 56
Each square is a day, Sat Jun 6 to Fri Jul 31, two weeks per row (each column is the same weekday); filled = flew.
How late it arrives
Share of flights that operated arriving more than this late.
Horizontal: minutes late at arrival (0 to 3 hours). Vertical: share of flights later than that.
Its hour at IAD
All flights leaving Dulles (IAD) at 7–8 am, wherever they’re going: 88% left within 15 minutes and 1.8% were cancelled (1,720 flights in the year). Other Delta flights on this route →
Upcoming forecasts
Our odds that this flight is late or cancelled on the days we publish.