Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Chicago → Tucson via San Francisco: arrives on time 53%
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12:45 ORD → 15:35 SFOUA 1097 · United · 4h 55m · 79% on time, 0.0% cancelled
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50m layover in San Francisco (SFO) · 45 min minimum on one ticket
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16:25 SFO → 19:26 TUSUA 5962 · United, flown by SkyWest · 2h 16m · 76% on time, 1.2% cancelled
Total trip 7h 56m, scheduled departure to arrival (Tucson is 2 h behind Chicago). Times are local. Both flew on 0 of the last 56 days, too few to list among the best connections.
Makes the connection71%The first flight arrived more than 5 minutes late on 29% of the days it flew: too late for the 45-minute minimum connection on a 50m layover.
Arrives on time53%First flight not cancelled (0.0% are) × connection made (71%) × second flight not cancelled (1.2% are) and within 15 minutes (76%).
Total trip7h 56mORD 12:45 to TUS 19:26, 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.