Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026

Dulles → Houston via Denver: arrives on time 81%

06:30 IAD → 08:22 DEN

UA 2031 · United · 3h 52m · 100% on time, 0.0% cancelled
1h 53m layover in Denver (DEN) · 90 min minimum on separate tickets
10:15 DEN → 13:55 HOU

WN 1543 · Southwest · 2h 40m · 81% on time, 0.0% cancelled

Total trip 8h 25m, scheduled departure to arrival (Houston is 1 h behind Dulles). Times are local. Both flew on 36 of the last 56 days.

Makes the connection100%The first flight arrived more than 23 minutes late on 0% of the days it flew: too late for the 90-minute minimum connection on a 1h 53m layover.

Arrives on time81%First flight not cancelled (0.0% are) × connection made (100%) × second flight not cancelled (0.0% are) and within 15 minutes (81%).

Total trip8h 25mIAD 06:30 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.