Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Dulles → San Francisco via Houston: arrives on time 39%
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14:53 IAD → 17:11 IAHUA 2857 · United · 3h 18m · 70% on time, 0.0% cancelled
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54m layover in Houston (IAH) · 45 min minimum on one ticket
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18:05 IAH → 20:10 SFOUA 1341 · United · 4h 05m · 62% on time, 1.5% cancelled
Total trip 8h 17m, scheduled departure to arrival (San Francisco is 3 h behind Dulles). Times are local. Both flew on 29 of the last 56 days.
Makes the connection63%The first flight arrived more than 9 minutes late on 37% of the days it flew: too late for the 45-minute minimum connection on a 54m layover.
Arrives on time39%First flight not cancelled (0.0% are) × connection made (63%) × second flight not cancelled (1.5% are) and within 15 minutes (62%).
Total trip8h 17mIAD 14:53 to SFO 20:10, 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.