Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Seattle → Houston via San Francisco: arrives on time 41%
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13:30 SEA → 15:48 SFOUA 737 · United · 2h 18m · 56% on time, 0.6% cancelled
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52m layover in San Francisco (SFO) · 45 min minimum on one ticket
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16:40 SFO → 22:52 IAHUA 2305 · United · 4h 12m · 85% on time, 0.0% cancelled
Total trip 7h 22m, 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 connection49%The first flight arrived more than 7 minutes late on 51% of the days it flew: too late for the 45-minute minimum connection on a 52m layover.
Arrives on time41%First flight not cancelled (0.6% are) × connection made (49%) × second flight not cancelled (0.0% are) and within 15 minutes (85%).
Total trip7h 22mSEA 13:30 to IAH 22:52, 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.