Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Francisco → Boston via Chicago: arrives on time 88%
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23:08 SFO → 05:29 ORDAA 2554 · American · 4h 15m · 73% on time, 1.4% cancelled
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3h 01m layover in Chicago (ORD) · 45 min minimum on one ticket
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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 59m, 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 136 minutes late on 1% of the days it flew: too late for the 45-minute minimum connection on a 3h 01m layover.
Arrives on time88%First flight not cancelled (1.4% are) × connection made (99%) × second flight not cancelled (0.0% are) and within 15 minutes (91%).
Total trip9h 59mSFO 23:08 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.