Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
WN 4436 · Baltimore (BWI) → Denver (DEN)
Sold by Southwest. Still flying: 40 of the last 56 days (Mon–Fri).
Arrives on time76%within 15 minutes, of 42 flights
Cancelled0.0%of scheduled flights
An hour or more late0%of flights that operated
When late, on average29 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Denver is 2 h behind Baltimore).
- Leaves BWI
- 06:05
- Arrives DEN
- 07:50
- Flight time
- 3h 45m
- Days flown, last 8 weeks
- 40 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 BWI
All flights leaving Baltimore (BWI) at 6–7 am, wherever they’re going: 91% left within 15 minutes and 1.8% were cancelled (9,102 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.