Southwest Airlines MDW to SFO on-time performance
Southwest Airlines nonstop flights from Chicago to San Francisco · Aug 2025 – Jul 2026
On-time arrivals
48%
arrived < 15 min late
Cancelled
1.2%
6 flights
Avg arrival delay
30 min
56 min when late
Rank on route
#1 of 1
route average 48% on time
Key facts
- Southwest Airlines flights on MDW to SFO arrived on time 48% of the time in Aug 2025 – Jul 2026.
- 1.2% were cancelled, and 15% arrived an hour or more late.
- That ranks #1 of 1 airlines on this route, which averaged 48% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (43%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion43%
- Late-arriving aircraft30%
- Airline (crew, maintenance, cleaning, fueling)24%
- Extreme weather3%
- Security0%
Other airlines on MDW to SFO
485 Southwest Airlines flights tracked on this route; 6 cancelled, 1 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.