Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Boston → San Francisco via Dulles: arrives on time 81%
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05:45 BOS → 07:23 IADUA 1734 · United · 1h 38m · 97% on time, 2.3% cancelled
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1h 12m layover in Dulles (IAD) · 45 min minimum on one ticket
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08:35 IAD → 11:19 SFOUA 1147 · United · 5h 44m · 86% on time, 1.0% cancelled
Total trip 8h 34m, scheduled departure to arrival (San Francisco 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 27 minutes late on 2% of the days it flew: too late for the 45-minute minimum connection on a 1h 12m layover.
Arrives on time81%First flight not cancelled (2.3% are) × connection made (98%) × second flight not cancelled (1.0% are) and within 15 minutes (86%).
Total trip8h 34mBOS 05:45 to SFO 11:19, 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.