Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Chicago → Denver via San Francisco: arrives on time 48%
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10:25 ORD → 13:14 SFOUA 543 · United · 4h 49m · 63% on time, 2.0% cancelled
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1h 06m layover in San Francisco (SFO) · 45 min minimum on one ticket
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14:20 SFO → 18:11 DENUA 1596 · United · 2h 51m · 71% on time, 0.0% cancelled
Total trip 8h 46m, scheduled departure to arrival (Denver is 1 h behind Chicago). Times are local. Both flew on 56 of the last 56 days.
Makes the connection70%The first flight arrived more than 21 minutes late on 30% of the days it flew: too late for the 45-minute minimum connection on a 1h 06m layover.
Arrives on time48%First flight not cancelled (2.0% are) × connection made (70%) × second flight not cancelled (0.0% are) and within 15 minutes (71%).
Total trip8h 46mORD 10:25 to DEN 18:11, layover included
Tight connection: often missed. The first flight is late enough to miss it on more than 1 day in 4.
Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.