Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Seattle → Houston via San Francisco: arrives on time 35%
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08:45 SEA → 11:03 SFOUA 2831 · United · 2h 18m · 33% on time, 2.8% cancelled
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1h 12m layover in San Francisco (SFO) · 45 min minimum on one ticket
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12:15 SFO → 18:27 IAHUA 1387 · United · 4h 12m · 78% on time, 0.4% cancelled
Total trip 7h 42m, scheduled departure to arrival (Houston is 2 h ahead of Seattle). Times are local. Both flew on 56 of the last 56 days.
Makes the connection47%The first flight arrived more than 27 minutes late on 53% of the days it flew: too late for the 45-minute minimum connection on a 1h 12m layover.
Arrives on time35%First flight not cancelled (2.8% are) × connection made (47%) × second flight not cancelled (0.4% are) and within 15 minutes (78%).
Total trip7h 42mSEA 08:45 to IAH 18:27, 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.