Southwest Airlines DCA to STL on-time performance
Southwest Airlines nonstop flights from Washington to St. Louis · Aug 2025 – Jul 2026
On-time arrivals
75%
arrived < 15 min late
Cancelled
1.4%
20 flights
Avg arrival delay
16 min
60 min when late
Rank on route
#3 of 5
route average 73% on time
Key facts
- Southwest Airlines flights on DCA to STL arrived on time 75% of the time in Aug 2025 – Jul 2026.
- 1.4% were cancelled, and 7% arrived an hour or more late.
- That ranks #3 of 5 airlines on this route, which averaged 73% on time overall.
- The largest source of delay minutes was late-arriving aircraft (51%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft51%
- Airline (crew, maintenance, cleaning, fueling)32%
- Air traffic control & airport congestion12%
- Extreme weather5%
- Security0%
Other airlines on DCA to STL
- PSA Airlines68% on time · 26 min avg delay
- Republic Airways78% on time · 13 min avg delay
- American Airlines68% on time · 32 min avg delay
- Envoy Air90% on time · 4 min avg delay
Full DCA to STL comparison →
Southwest Airlines on-time record across all routes →
1,402 Southwest Airlines flights tracked on this route; 20 cancelled, 2 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.