Republic Airways is the most reliable airline on the IAD to STL route with a 89% on-time rate. Based on 201 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: IAD to STL
Washington to St. Louis — airline reliability comparison
On-Time Rate by Airline
Republic Airways89%
IAD to STL Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Republic AirwaysYXBest | 89% | 0.5% | 58m | 201 |
Route Overview
90%
Overall On-Time
59m
Avg Delay
0.5%
Cancel Rate
201
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.