Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Chicago → San Francisco via Boston: arrives on time 78%
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06:00 ORD → 09:34 BOSAA 3022 · American · 2h 34m · 97% on time, 0.0% cancelled
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2h 01m layover in Boston (BOS) · 90 min minimum on separate tickets
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11:35 BOS → 15:02 SFOUA 1074 · United · 6h 27m · 80% on time, 0.4% cancelled
Total trip 11h 02m, scheduled departure to arrival (San Francisco is 2 h behind Chicago). Times are local. Both flew on 46 of the last 56 days.
Makes the connection97%The first flight arrived more than 31 minutes late on 3% of the days it flew: too late for the 90-minute minimum connection on a 2h 01m layover.
Arrives on time78%First flight not cancelled (0.0% are) × connection made (97%) × second flight not cancelled (0.4% are) and within 15 minutes (80%).
Total trip11h 02mORD 06:00 to SFO 15:02, 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.