Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
WN 4377 · Washington (DCA) → Dallas (DAL)
Sold by Southwest. Still flying: 48 of the last 56 days (Mon, Tue, Wed, Thu, Fri, Sun).
Arrives on time38%within 15 minutes, of 50 flights
Cancelled6.0%of scheduled flights
An hour or more late40%of flights that operated
When late, on average89 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Dallas is 1 h behind Washington).
- Leaves DCA
- 20:35
- Arrives DAL
- 22:50
- Flight time
- 3h 15m
- Days flown, last 8 weeks
- 48 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 DCA
All flights leaving Washington (DCA) at 8–9 pm, wherever they’re going: 64% left within 15 minutes and 6.1% were cancelled (7,377 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.