Southwest Airlines STL to DCA on-time performance
Southwest Airlines nonstop flights from St. Louis to Washington · Aug 2025 – Jul 2026
On-time arrivals
73%
arrived < 15 min late
Cancelled
1.4%
19 flights
Avg arrival delay
17 min
56 min when late
Rank on route
#4 of 5
route average 73% on time
Key facts
- Southwest Airlines flights on STL to DCA arrived on time 73% of the time in Aug 2025 – Jul 2026.
- 1.4% were cancelled, and 8% arrived an hour or more late.
- That ranks #4 of 5 airlines on this route, which averaged 73% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (36%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion36%
- Late-arriving aircraft35%
- Airline (crew, maintenance, cleaning, fueling)27%
- Extreme weather3%
- Security0%
Other airlines on STL to DCA
- PSA Airlines74% on time · 31 min avg delay
- Republic Airways75% on time · 21 min avg delay
- American Airlines75% on time · 21 min avg delay
- Envoy Air73% on time · 11 min avg delay
Full STL to DCA comparison →
Southwest Airlines on-time record across all routes →
1,403 Southwest Airlines flights tracked on this route; 19 cancelled, 12 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.