Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Francisco → Boston via Chicago: arrives on time 89%
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23:30 SFO → 05:57 ORDUA 368 · United · 4h 27m · 86% on time, 1.4% cancelled
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2h 33m layover in Chicago (ORD) · 90 min minimum on separate tickets
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08:30 ORD → 12:07 BOS +1 dayAA 4106 · American, flown by Envoy · 2h 37m · 91% on time, 0.0% cancelled
Total trip 9h 37m, 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 connection99%The first flight arrived more than 63 minutes late on 1% of the days it flew: too late for the 90-minute minimum connection on a 2h 33m layover.
Arrives on time89%First flight not cancelled (1.4% are) × connection made (99%) × second flight not cancelled (0.0% are) and within 15 minutes (91%).
Total trip9h 37mSFO 23:30 to BOS 12:07, 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.