Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Dulles → San Francisco via Denver: arrives on time 51%
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17:41 IAD → 19:45 DENUA 599 · United · 4h 04m · 74% on time, 1.2% cancelled
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1h 25m layover in Denver (DEN) · 45 min minimum on one ticket
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21:10 DEN → 22:56 SFOUA 2123 · United · 2h 46m · 60% on time, 0.0% cancelled
Total trip 8h 15m, scheduled departure to arrival (San Francisco is 3 h behind Dulles). Times are local. Both flew on 56 of the last 56 days.
Makes the connection85%The first flight arrived more than 40 minutes late on 15% of the days it flew: too late for the 45-minute minimum connection on a 1h 25m layover.
Arrives on time51%First flight not cancelled (1.2% are) × connection made (85%) × second flight not cancelled (0.0% are) and within 15 minutes (60%).
Total trip8h 15mIAD 17:41 to SFO 22:56, 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.