Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Francisco → St Louis via Denver: arrives on time 85%
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06:00 SFO → 09:49 DENF9 1230 · Frontier · 2h 49m · 88% on time, 0.9% cancelled
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3h 36m layover in Denver (DEN) · 90 min minimum on separate tickets
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13:25 DEN → 16:33 STLUA 1639 · United · 2h 08m · 87% on time, 0.0% cancelled
Total trip 8h 33m, scheduled departure to arrival (St Louis is 2 h ahead of San Francisco). Times are local. Both flew on 55 of the last 56 days.
Makes the connection98%The first flight arrived more than 126 minutes late on 2% of the days it flew: too late for the 90-minute minimum connection on a 3h 36m layover.
Arrives on time85%First flight not cancelled (0.9% are) × connection made (98%) × second flight not cancelled (0.0% are) and within 15 minutes (87%).
Total trip8h 33mSFO 06:00 to STL 16:33, 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.