Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Houston → Ontario via San Francisco: arrives on time 42%
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18:05 IAH → 20:10 SFOUA 1341 · United · 4h 05m · 62% on time, 1.5% cancelled
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50m 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 6h 32m, scheduled departure to arrival (Ontario is 2 h behind Houston). Times are local. Both flew on 56 of the last 56 days.
Makes the connection52%The first flight arrived more than 5 minutes late on 48% of the days it flew: too late for the 45-minute minimum connection on a 50m layover.
Arrives on time42%First flight not cancelled (1.5% are) × connection made (52%) × second flight not cancelled (0.5% are) and within 15 minutes (83%).
Total trip6h 32mIAH 18:05 to ONT 22:37, layover included
Tight connection: often missed. The first flight is late enough to miss it on more than 1 day in 4.
Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.