BOS (Boston) to STL (St. Louis) flights arrive on time 80% of the time. The most reliable airline on this route is Republic Airways at 87%. The average delay is 60 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated October 2026.BOS → STL
BOS (Boston) to STL (St. Louis)
BOS → STL on-time performance by month
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This route is on time most of the time. About 80% 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 77% on time.
Airline Comparison
Republic Airways leads at 87% on time; Southwest Airlines trails at 77%.
Accurate?
Good to know
Departing from BOS
77% on timeExpect ~20 min sitting on the taxiway after your gate pushes back. BOS has long runway queues.
TSA is currently ~29 min. Best time: 4 AM (about 5 min).
Arriving at STL
80% on timeWhen flights into STL are late, the average delay is 64 minutes. Build buffer if you have ground plans.
If connecting at STL: TSA is ~23 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what Republic Airways owes you — refund rights, action plan, complaint email. Free.
Flying out of BOS? 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.