Flight Reliability
WN 4937 · Southwest Airlines
Washington → Houston (DCA–HOU)98% of its flights flew this route. The rest (DEN–STL) are included in these numbers.
72
Usually Fine
WanderNerd Reliability Score
- 91%
- Arrive within 15 minutes
- 17 min early
- Average arrival delay
- 6.8%
- Cancelled
- 19 min early
- Median arrival delay
Based on 59 historical flights. Data through May 2026.
What the data says
Morning-you made the right choice.
WN 4937 departing between 6–9 AM arrived on time 97% of the time, versus 85% between 6–9 PM.
Better than the DCA–HOU route average.
WN 4937 arrived on time 91% of the time, versus 79% across the DCA–HOU route.
Better than the Southwest Airlines network average.
WN 4937 arrived on time 91% of the time, versus 78% across the Southwest Airlines network.
The breakdown
- Mon—(7 flights)
- Tue—(9 flights)
- Wed—(9 flights)
- Thu—(7 flights)
- Fri—(8 flights)
- Sat—(8 flights)
- Sun—(7 flights)
- 6–9 AM97%(29 flights)
- 6–9 PM85%(26 flights)
- Departures on time
- 86%
- Diverted
- 0%
- Flights flown
- 55
- Months covered
- 4
Same route, other flights
Keep nerding
Based on 59 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.