Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
WN 4637 · Chicago (MDW) → Los Angeles (LAX)
Sold by Southwest. Still flying: 32 of the last 56 days (Mon, Thu, Fri, Sun).
Arrives on time88%within 15 minutes, of 34 flights
Cancelled0.0%of scheduled flights
An hour or more late0%of flights that operated
When late, on average34 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Los Angeles is 2 h behind Chicago).
- Leaves MDW
- 05:10
- Arrives LAX
- 07:25
- Flight time
- 4h 15m
- Days flown, last 8 weeks
- 32 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 MDW
All flights leaving Chicago (MDW) at 5–6 am, wherever they’re going: 94% left within 15 minutes and 0.8% were cancelled (2,387 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.