Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Houston → Ontario via San Francisco: arrives on time 81%
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15:30 IAH → 17:35 SFOUA 589 · United · 4h 05m · 80% on time, 0.0% cancelled
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3h 25m 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 9h 07m, scheduled departure to arrival (Ontario is 2 h behind Houston). Times are local. Both flew on 55 of the last 56 days.
Makes the connection98%The first flight arrived more than 160 minutes late on 2% of the days it flew: too late for the 45-minute minimum connection on a 3h 25m layover.
Arrives on time81%First flight not cancelled (0.0% are) × connection made (98%) × second flight not cancelled (0.5% are) and within 15 minutes (83%).
Total trip9h 07mIAH 15:30 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.