Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Chicago → Ontario via San Francisco: arrives on time 78%
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14:30 ORD → 17:19 SFOUA 1577 · United · 4h 49m · 74% on time, 1.1% cancelled
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3h 41m layover in San Francisco (SFO) · 45 min minimum on one ticket
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21:00 SFO → 22:37 ONTUA 552 · United · 1h 37m · 83% on time, 0.5% cancelled
Total trip 10h 07m, scheduled departure to arrival (Ontario is 2 h behind Chicago). Times are local. Both flew on 51 of the last 56 days.
Makes the connection96%The first flight arrived more than 176 minutes late on 4% of the days it flew: too late for the 45-minute minimum connection on a 3h 41m layover.
Arrives on time78%First flight not cancelled (1.1% are) × connection made (96%) × second flight not cancelled (0.5% are) and within 15 minutes (83%).
Total trip10h 07mORD 14:30 to ONT 22:37, 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.