Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
WN 4140 · Chicago (MDW) → Atlanta (ATL)
Sold by Southwest. Still flying: 32 of the last 56 days (Mon, Thu, Fri, Sat).
Arrives on time36%within 15 minutes, of 34 flights
Cancelled2.9%of scheduled flights
An hour or more late21%of flights that operated
When late, on average61 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Atlanta is 1 h ahead of Chicago).
- Leaves MDW
- 18:50
- Arrives ATL
- 21:45
- Flight time
- 1h 55m
- 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 6–7 pm, wherever they’re going: 58% left within 15 minutes and 2.1% were cancelled (6,318 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.