Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
WN 3615 · Seattle (SEA) → Denver (DEN)
Sold by Southwest. Still flying: 55 of the last 56 days (Daily).
Arrives on time95%within 15 minutes, of 57 flights
Cancelled0.0%of scheduled flights
An hour or more late4%of flights that operated
When late, on average208 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Denver is 1 h ahead of Seattle).
- Leaves SEA
- 05:15
- Arrives DEN
- 08:50
- Flight time
- 2h 35m
- Days flown, last 8 weeks
- 55 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 SEA
All flights leaving Seattle (SEA) at 5–6 am, wherever they’re going: 94% left within 15 minutes and 0.8% were cancelled (2,543 flights in the year). Other Southwest flights on this route →
Upcoming forecasts
Our odds that this flight is late or cancelled on the days we publish.