BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
AIRLINE × ROUTE REPORT
SEA→MDW

Southwest Airlines Seattle, WA (SEA) to Chicago, IL (MDW) reliability

Among 678 scheduled Southwest Airlines flights from SEA to MDW, 79.8% arrived on time, 11.1% arrived at least 30 minutes late, and 0.6% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Marketing carrier: Southwest Airlines (WN) · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable
79.8%arrived on time
11.1%30+ min late
0.6%cancelled
678scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
30+ minutes late11.1%
60+ minutes late3.4%
Cancelled0.6%
Average arrival+0.2 mincompleted flights

What did Southwest Airlines SEA to MDW record?

Southwest Airlines completed 98.8% of its scheduled reportable SEA to MDW flights in the observation window. 79.8% of all scheduled flights arrived less than 15 minutes late, while 3.4% arrived at least an hour late.

What were Southwest Airlines SEA to MDW disruption rates?

For Southwest Airlines SEA-to-MDW flights, 11.1% arrived at least 30 minutes late, 0.6% were cancelled, and 0.6% were diverted.

Compare all airlines on this route

What was the Southwest Airlines SEA to MDW scheduled cohort?

The Southwest Airlines SEA-to-MDW cohort contained 678 scheduled flights; 670 completed, 4 were cancelled, and 4 were diverted.

Not a prediction.

This is a descriptive historical rate. Schedule changes, seasonal operations and current conditions may differ.