Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Antonio → Boston via St Louis: arrives on time 28%
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16:50 SAT → 19:00 STLWN 3590 · Southwest · 2h 10m · 50% on time, 0.0% cancelled
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55m layover in St Louis (STL) · 45 min minimum on one ticket
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19:55 STL → 23:25 BOSWN 4724 · Southwest · 2h 30m · 61% on time, 0.0% cancelled
Total trip 5h 35m, scheduled departure to arrival (Boston is 1 h ahead of San Antonio). Times are local. Both flew on 24 of the last 56 days.
Makes the connection46%The first flight arrived more than 10 minutes late on 54% of the days it flew: too late for the 45-minute minimum connection on a 55m layover.
Arrives on time28%First flight not cancelled (0.0% are) × connection made (46%) × second flight not cancelled (0.0% are) and within 15 minutes (61%).
Total trip5h 35mSAT 16:50 to BOS 23:25, layover included
Tight connection: often missed. The first flight is late enough to miss it on more than 1 day in 4.
Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.