Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Ontario → Chicago via San Francisco: arrives on time 82%
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13:50 ONT → 15:15 SFOUA 1375 · United · 1h 25m · 57% on time, 0.0% cancelled
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3h 45m layover in San Francisco (SFO) · 45 min minimum on one ticket
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19:00 SFO → 01:28 ORD +1 dayUA 1958 · United · 4h 28m · 92% on time, 7.7% cancelled
Total trip 9h 38m, scheduled departure to arrival (Chicago is 2 h ahead of Ontario). Times are local. Both flew on 0 of the last 56 days, too few to list among the best connections.
Makes the connection97%The first flight arrived more than 180 minutes late on 3% of the days it flew: too late for the 45-minute minimum connection on a 3h 45m layover.
Arrives on time82%First flight not cancelled (0.0% are) × connection made (97%) × second flight not cancelled (7.7% are) and within 15 minutes (92%).
Total trip9h 38mONT 13:50 to ORD 01:28, 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.