Southwest Airlines MDW to MIA on-time performance
Southwest Airlines nonstop flights from Chicago to Miami · Aug 2025 – Jul 2026
On-time arrivals
73%
arrived < 15 min late
Cancelled
1.1%
5 flights
Avg arrival delay
15 min
48 min when late
Rank on route
#2 of 2
route average 73% on time
Key facts
- Southwest Airlines flights on MDW to MIA arrived on time 73% of the time in Aug 2025 – Jul 2026.
- 1.1% were cancelled, and 6% arrived an hour or more late.
- That ranks #2 of 2 airlines on this route, which averaged 73% on time overall.
- The largest source of delay minutes was late-arriving aircraft (41%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft41%
- Airline (crew, maintenance, cleaning, fueling)31%
- Air traffic control & airport congestion27%
- Security0%
- Extreme weather0%
Other airlines on MDW to MIA
- Frontier Airlines75% on time · 21 min avg delay
Full MDW to MIA comparison →
Southwest Airlines on-time record across all routes →
439 Southwest Airlines flights tracked on this route; 5 cancelled, 3 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.