Republic Airways is the most reliable airline on the STL to DCA route with a 87% on-time rate, compared to Southwest Airlines at 76%. Based on 892 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: STL to DCA
St. Louis to Washington — airline reliability comparison
On-Time Rate by Airline
Republic Airways87%
PSA Airlines80%
79%
American Airlines77%
Southwest Airlines76%
STL to DCA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Republic AirwaysYXBest | 87% | 3.1% | 48m | 892 |
| PSA AirlinesOH | 80% | 4.0% | 111m | 1,472 |
| MQ | 79% | 0.0% | 38m | 19 |
| American AirlinesAA | 77% | 1.3% | 104m | 983 |
| Southwest AirlinesWNWorst | 76% | 1.1% | 53m | 4,949 |
Route Overview
78%
Overall On-Time
70m
Avg Delay
1.9%
Cancel Rate
8,378
Total Flights
Flying out of STL? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.