Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Dulles → Houston via San Antonio: arrives on time 73%
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08:25 IAD → 10:59 SATUA 1789 · United · 3h 34m · 94% on time, 0.7% cancelled
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1h 51m layover in San Antonio (SAT) · 90 min minimum on separate tickets
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12:50 SAT → 13:55 HOUWN 3566 · Southwest · 1h 05m · 78% on time, 0.0% cancelled
Total trip 6h 30m, scheduled departure to arrival (Houston is 1 h behind Dulles). Times are local. Both flew on 48 of the last 56 days.
Makes the connection95%The first flight arrived more than 21 minutes late on 5% of the days it flew: too late for the 90-minute minimum connection on a 1h 51m layover.
Arrives on time73%First flight not cancelled (0.7% are) × connection made (95%) × second flight not cancelled (0.0% are) and within 15 minutes (78%).
Total trip6h 30mIAD 08:25 to HOU 13:55, 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.