Southwest Airlines DTW to STL on-time performance
Southwest Airlines nonstop flights from Detroit to St. Louis · Aug 2025 – Jul 2026
On-time arrivals
76%
arrived < 15 min late
Cancelled
0.5%
3 flights
Avg arrival delay
14 min
54 min when late
Rank on route
#3 of 4
route average 77% on time
Key facts
- Southwest Airlines flights on DTW to STL arrived on time 76% of the time in Aug 2025 – Jul 2026.
- 0.5% were cancelled, and 7% arrived an hour or more late.
- That ranks #3 of 4 airlines on this route, which averaged 77% on time overall.
- The largest source of delay minutes was late-arriving aircraft (63%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft63%
- Airline (crew, maintenance, cleaning, fueling)23%
- Air traffic control & airport congestion12%
- Extreme weather2%
- Security0%
Other airlines on DTW to STL
- Delta Air Lines80% on time · 13 min avg delay
- SkyWest Airlines61% on time · 35 min avg delay
- Spirit Airlines89% on time · 16 min avg delay
Full DTW to STL comparison →
Southwest Airlines on-time record across all routes →
597 Southwest Airlines flights tracked on this route; 3 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.