Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Francisco → Boston via Detroit: arrives on time 89%
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21:30 SFO → 05:20 DTWUA 234 · United · 4h 50m · 100% on time, 0.0% cancelled
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1h 45m layover in Detroit (DTW) · 90 min minimum on separate tickets
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07:05 DTW → 09:07 BOS +1 dayDL 1163 · Delta · 2h 02m · 91% on time, 2.2% cancelled
Total trip 8h 37m, scheduled departure to arrival (Boston is 3 h ahead of San Francisco). Times are local. Both flew on 28 of the last 56 days.
Makes the connection100%The first flight arrived more than 15 minutes late on 0% of the days it flew: too late for the 90-minute minimum connection on a 1h 45m layover.
Arrives on time89%First flight not cancelled (0.0% are) × connection made (100%) × second flight not cancelled (2.2% are) and within 15 minutes (91%).
Total trip8h 37mSFO 21:30 to BOS 09:07, 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.