Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
WN 4639 · Houston (HOU) → Denver (DEN)
Sold by Southwest. Still flying: 55 of the last 56 days (Daily).
Arrives on time72%within 15 minutes, of 57 flights
Cancelled0.0%of scheduled flights
An hour or more late11%of flights that operated
When late, on average62 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 behind Houston).
- Leaves HOU
- 19:10
- Arrives DEN
- 20:55
- Flight time
- 2h 45m
- 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 HOU
All flights leaving Houston (HOU) at 7–8 pm, wherever they’re going: 56% left within 15 minutes and 0.7% were cancelled (2,804 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.