Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Francisco → Houston via Denver: arrives on time 89%
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21:39 SFO → 01:34 DENF9 3440 · Frontier · 2h 51m · 61% on time, 0.0% cancelled
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3h 26m layover in Denver (DEN) · 90 min minimum on separate tickets
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05:00 DEN → 08:32 IAH +1 dayUA 320 · United · 2h 32m · 97% on time, 0.5% cancelled
Total trip 8h 53m, scheduled departure to arrival (Houston is 2 h ahead of San Francisco). Times are local. Both flew on 38 of the last 56 days.
Makes the connection92%The first flight arrived more than 116 minutes late on 8% of the days it flew: too late for the 90-minute minimum connection on a 3h 26m layover.
Arrives on time89%First flight not cancelled (0.0% are) × connection made (92%) × second flight not cancelled (0.5% are) and within 15 minutes (97%).
Total trip8h 53mSFO 21:39 to IAH 08:32, 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.