Southwest Airlines STL to DTW on-time performance
Southwest Airlines nonstop flights from St. Louis to Detroit · Aug 2025 – Jul 2026
On-time arrivals
72%
arrived < 15 min late
Cancelled
0.2%
1 flights
Avg arrival delay
17 min
57 min when late
Rank on route
#3 of 4
route average 81% on time
Key facts
- Southwest Airlines flights on STL to DTW arrived on time 72% of the time in Aug 2025 – Jul 2026.
- 0.2% were cancelled, and 9% arrived an hour or more late.
- That ranks #3 of 4 airlines on this route, which averaged 81% 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)28%
- Air traffic control & airport congestion6%
- Extreme weather1%
- Security0%
Other airlines on STL to DTW
- Delta Air Lines88% on time · 13 min avg delay
- SkyWest Airlines71% on time · 32 min avg delay
- Spirit Airlines84% on time · 54 min avg delay
Full STL to DTW comparison →
Southwest Airlines on-time record across all routes →
597 Southwest Airlines flights tracked on this route; 1 cancelled, 0 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.