Flight Reliability
WN 4904 · Southwest Airlines
Philadelphia → Chicago (PHL–MDW)88% of its flights flew this route. The rest (CHS–AUS, MCI–MDW) are included in these numbers.
66
Usually Fine
WanderNerd Reliability Score
- 82%
- Arrive within 15 minutes
- 2 min
- Average arrival delay
- 3.0%
- Cancelled
- 6 min early
- Median arrival delay
Based on 66 historical flights. Data through May 2026.
What the data says
Better than the PHL–MDW route average.
WN 4904 arrived on time 82% of the time, versus 73% across the PHL–MDW route.
A bit ahead of the Southwest Airlines network.
WN 4904 arrived on time 82% of the time, versus 78% across the Southwest Airlines network.
The breakdown
- Mon—(5 flights)
- Tue—(9 flights)
- Wed—(9 flights)
- Thu—(8 flights)
- Fri—(7 flights)
- Sat—(8 flights)
- Sun69%(16 flights)
- 3–6 AM85%(54 flights)
- 9 AM–12 PM—(1 flights)
- 12–3 PM—(6 flights)
- 3–6 PM—(1 flights)
- Departures on time
- 94%
- Diverted
- 3.0%
- Flights flown
- 62
- Months covered
- 6
Same route, other flights
Keep nerding
Based on 66 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.