Southwest Airlines DEN to STL on-time performance
Southwest Airlines nonstop flights from Denver to St. Louis · Aug 2025 – Jul 2026
On-time arrivals
77%
arrived < 15 min late
Cancelled
0.5%
12 flights
Avg arrival delay
15 min
59 min when late
Rank on route
#4 of 4
route average 78% on time
Key facts
- Southwest Airlines flights on DEN to STL arrived on time 77% of the time in Aug 2025 – Jul 2026.
- 0.5% were cancelled, and 8% arrived an hour or more late.
- That ranks #4 of 4 airlines on this route, which averaged 78% on time overall.
- The largest source of delay minutes was late-arriving aircraft (59%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft59%
- Airline (crew, maintenance, cleaning, fueling)31%
- Air traffic control & airport congestion8%
- Extreme weather2%
- Security1%
Other airlines on DEN to STL
- United Airlines79% on time · 14 min avg delay
- Frontier Airlines84% on time · 9 min avg delay
- SkyWest Airlines82% on time · 8 min avg delay
Full DEN to STL comparison →
Southwest Airlines on-time record across all routes →
2,194 Southwest Airlines flights tracked on this route; 12 cancelled, 5 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.