Southwest Airlines ATL to STL on-time performance
Southwest Airlines nonstop flights from Atlanta to St. Louis · Aug 2025 – Jul 2026
On-time arrivals
79%
arrived < 15 min late
Cancelled
0.4%
4 flights
Avg arrival delay
13 min
57 min when late
Rank on route
#2 of 3
route average 82% on time
Key facts
- Southwest Airlines flights on ATL to STL arrived on time 79% of the time in Aug 2025 – Jul 2026.
- 0.4% were cancelled, and 6% arrived an hour or more late.
- That ranks #2 of 3 airlines on this route, which averaged 82% on time overall.
- The largest source of delay minutes was late-arriving aircraft (64%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft64%
- Airline (crew, maintenance, cleaning, fueling)26%
- Air traffic control & airport congestion5%
- Extreme weather3%
- Security1%
Other airlines on ATL to STL
- Delta Air Lines85% on time · 10 min avg delay
- Frontier Airlines68% on time · 17 min avg delay
Full ATL to STL comparison →
Southwest Airlines on-time record across all routes →
1,105 Southwest Airlines flights tracked on this route; 4 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.