Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Atlanta → Ontario via San Francisco: arrives on time 30%
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18:00 ATL → 20:10 SFOUA 285 · United · 5h 10m · 42% 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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21:00 SFO → 22:37 ONTUA 552 · United · 1h 37m · 83% on time, 0.5% cancelled
Total trip 7h 37m, scheduled departure to arrival (Ontario is 3 h behind Atlanta). Times are local. Both flew on 52 of the last 56 days.
Makes the connection36%The first flight arrived more than 5 minutes late on 64% of the days it flew: too late for the 45-minute minimum connection on a 50m layover.
Arrives on time30%First flight not cancelled (0.0% are) × connection made (36%) × second flight not cancelled (0.5% are) and within 15 minutes (83%).
Total trip7h 37mATL 18:00 to ONT 22:37, 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.