Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
WN 3153 · Ontario (ONT) → Chicago (MDW)
Sold by Southwest. Still flying: 56 of the last 56 days (Daily).
Arrives on time83%within 15 minutes, of 58 flights
Cancelled0.0%of scheduled flights
An hour or more late2%of flights that operated
When late, on average32 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Chicago is 2 h ahead of Ontario).
- Leaves ONT
- 23:55
- Arrives MDW
- 05:40
- Flight time
- 3h 45m
- Days flown, last 8 weeks
- 56 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 ONT
All flights leaving Ontario (ONT) at 11 pm–12 am, wherever they’re going: 79% left within 15 minutes and 2.4% were cancelled (594 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.