Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Francisco → Chicago via Boston: arrives on time 91%
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21:25 SFO → 06:21 BOSUA 796 · United · 5h 56m · 87% on time, 0.5% cancelled
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1h 54m layover in Boston (BOS) · 45 min minimum on one ticket
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08:15 BOS → 10:12 ORD +1 dayUA 1834 · United · 2h 57m · 92% on time, 0.0% cancelled
Total trip 10h 47m, scheduled departure to arrival (Chicago is 2 h ahead of San Francisco). Times are local. Both flew on 39 of the last 56 days.
Makes the connection98%The first flight arrived more than 69 minutes late on 2% of the days it flew: too late for the 45-minute minimum connection on a 1h 54m layover.
Arrives on time91%First flight not cancelled (0.5% are) × connection made (98%) × second flight not cancelled (0.0% are) and within 15 minutes (92%).
Total trip10h 47mSFO 21:25 to ORD 10:12, 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.