Flight Reliability
WN 4977 · Southwest Airlines
San Jose → Las Vegas (SJC–LAS)84% of its flights flew this route. The rest (BWI–RDU, BWI–MCO) are included in these numbers.
94
Nerd Approved
WanderNerd Reliability Score
- 93%
- Arrive within 15 minutes
- 2 min early
- Average arrival delay
- 1.8%
- Cancelled
- 6 min early
- Median arrival delay
Based on 56 historical flights. Data through May 2026.
What the data says
Better than the SJC–LAS route average.
WN 4977 arrived on time 93% of the time, versus 80% across the SJC–LAS route.
Better than the Southwest Airlines network average.
WN 4977 arrived on time 93% of the time, versus 78% across the Southwest Airlines network.
The breakdown
- Mon—(9 flights)
- Tue—(9 flights)
- Wed—(9 flights)
- Thu—(8 flights)
- Fri—(8 flights)
- Sat—(5 flights)
- Sun—(7 flights)
- 6–9 AM—(8 flights)
- 12–3 PM—(5 flights)
- 3–6 PM93%(42 flights)
- Departures on time
- 86%
- Diverted
- 0%
- Flights flown
- 55
- Months covered
- 4
Same route, other flights
Keep nerding
Based on 56 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.