STL (St. Louis) to DCA (Washington) flights arrive on time 78% of the time. The most reliable airline on this route is Republic Airways at 87%. The average delay is 70 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated October 2026.STL → DCA
STL (St. Louis) to DCA (Washington)
STL → DCA on-time performance by month
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JanFebMarAprMayJunJulAugSepOctNovDec
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This route is on time most of the time. About 78% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Republic Airways edges out Southwest Airlines on this route — 87% vs 76% on time.
Airline Comparison
Republic Airways leads at 87% on time; Southwest Airlines trails at 76%.
Accurate?
Good to know
Departing from STL
80% on timeTSA is currently ~23 min. Best time: 4 AM (about 5 min).
Arriving at DCA
77% on timeWhen flights into DCA are late, the average delay is 78 minutes. Build buffer if you have ground plans.
If connecting at DCA: TSA is ~26 min right now. Allow at least 60 minutes for a domestic connection.
DCA has a 2.7% cancellation rate — keep the airline app handy for rebooking.
Flight cancelled or delayed?
Check what Republic Airways owes you — refund rights, action plan, complaint email. Free.
Flying out of STL? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated October 2026. Source: Bureau of Transportation Statistics.