Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Francisco → Boston via Dulles: arrives on time 91%
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21:30 SFO → 05:53 IADUA 357 · United · 5h 23m · 74% on time, 0.0% cancelled
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2h 42m layover in Dulles (IAD) · 45 min minimum on one ticket
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08:35 IAD → 10:20 BOS +1 dayUA 641 · United · 1h 45m · 92% on time, 1.5% cancelled
Total trip 9h 50m, scheduled departure to arrival (Boston is 3 h ahead of San Francisco). Times are local. Both flew on 55 of the last 56 days.
Makes the connection100%The first flight arrived more than 117 minutes late on 0% of the days it flew: too late for the 45-minute minimum connection on a 2h 42m layover.
Arrives on time91%First flight not cancelled (0.0% are) × connection made (100%) × second flight not cancelled (1.5% are) and within 15 minutes (92%).
Total trip9h 50mSFO 21:30 to BOS 10:20, 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.