Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Boston → San Diego via Denver: arrives on time 81%
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06:25 BOS → 08:50 DENWN 4156 · Southwest · 4h 25m · 88% on time, 0.0% cancelled
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2h 25m layover in Denver (DEN) · 90 min minimum on separate tickets
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11:15 DEN → 12:41 SANUA 1940 · United · 2h 26m · 82% on time, 0.0% cancelled
Total trip 9h 16m, scheduled departure to arrival (San Diego is 3 h behind Boston). Times are local. Both flew on 56 of the last 56 days.
Makes the connection98%The first flight arrived more than 55 minutes late on 2% of the days it flew: too late for the 90-minute minimum connection on a 2h 25m layover.
Arrives on time81%First flight not cancelled (0.0% are) × connection made (98%) × second flight not cancelled (0.0% are) and within 15 minutes (82%).
Total trip9h 16mBOS 06:25 to SAN 12:41, 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.