Flight Reliability
WN 4874 · Southwest Airlines
ISP → Baltimore (ISP–BWI)83% of its flights flew this route. The rest (MCO–ELP, HOU–MCO) are included in these numbers.
72
Usually Fine
WanderNerd Reliability Score
- 86%
- Arrive within 15 minutes
- 4 min early
- Average arrival delay
- 5.7%
- Cancelled
- 11 min early
- Median arrival delay
Based on 70 historical flights. Data through May 2026.
What the data says
The 6–9 AM departure wins.
WN 4874 departing between 6–9 AM arrived on time 89% of the time, versus 80% between 9 AM–12 PM.
Better than the Southwest Airlines network average.
WN 4874 arrived on time 86% of the time, versus 78% across the Southwest Airlines network.
The breakdown
- Mon—(6 flights)
- Tue—(9 flights)
- Wed—(9 flights)
- Thu—(8 flights)
- Fri—(8 flights)
- Sat—(9 flights)
- Sun82%(17 flights)
- 3–6 AM86%(28 flights)
- 6–9 AM89%(27 flights)
- 9 AM–12 PM80%(10 flights)
- 9 PM–12 AM—(1 flights)
- Departures on time
- 88%
- Diverted
- 0%
- Flights flown
- 66
- Months covered
- 8
Same route, other flights
Keep nerding
Based on 70 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.