Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Dulles → Seattle via Denver: arrives on time 75%
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12:48 IAD → 14:42 DENUA 1587 · United · 3h 54m · 92% on time, 0.3% cancelled
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1h 16m layover in Denver (DEN) · 45 min minimum on one ticket
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15:58 DEN → 17:59 SEAUA 2013 · United · 3h 01m · 80% on time, 0.8% cancelled
Total trip 8h 11m, scheduled departure to arrival (Seattle is 3 h behind Dulles). Times are local. Both flew on 55 of the last 56 days.
Makes the connection94%The first flight arrived more than 31 minutes late on 6% of the days it flew: too late for the 45-minute minimum connection on a 1h 16m layover.
Arrives on time75%First flight not cancelled (0.3% are) × connection made (94%) × second flight not cancelled (0.8% are) and within 15 minutes (80%).
Total trip8h 11mIAD 12:48 to SEA 17:59, 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.