Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
St Louis → San Francisco via Chicago: arrives on time 62%
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17:59 STL → 19:30 ORDUA 1639 · United · 1h 31m · 66% on time, 5.6% cancelled
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2h 05m layover in Chicago (ORD) · 45 min minimum on one ticket
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21:35 ORD → 00:32 SFO +1 dayUA 2106 · United · 4h 57m · 78% on time, 2.5% cancelled
Total trip 8h 33m, scheduled departure to arrival (San Francisco is 2 h behind St Louis). Times are local. Both flew on 56 of the last 56 days.
Makes the connection87%The first flight arrived more than 80 minutes late on 13% of the days it flew: too late for the 45-minute minimum connection on a 2h 05m layover.
Arrives on time62%First flight not cancelled (5.6% are) × connection made (87%) × second flight not cancelled (2.5% are) and within 15 minutes (78%).
Total trip8h 33mSTL 17:59 to SFO 00:32, 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.