Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Francisco → Boston via Denver: arrives on time 80%
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05:10 SFO → 08:40 DENWN 1424 · Southwest · 2h 30m · 96% on time, 0.0% cancelled
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1h 20m layover in Denver (DEN) · 45 min minimum on one ticket
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10:00 DEN → 16:05 BOSWN 3690 · Southwest · 4h 05m · 83% on time, 0.0% cancelled
Total trip 7h 55m, scheduled departure to arrival (Boston is 3 h ahead of San Francisco). Times are local. Both flew on 31 of the last 56 days.
Makes the connection96%The first flight arrived more than 35 minutes late on 4% of the days it flew: too late for the 45-minute minimum connection on a 1h 20m layover.
Arrives on time80%First flight not cancelled (0.0% are) × connection made (96%) × second flight not cancelled (0.0% are) and within 15 minutes (83%).
Total trip7h 55mSFO 05:10 to BOS 16:05, layover included
Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.