Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Miami → Ontario via Atlanta: arrives on time 61%
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16:00 MIA → 18:22 ATLDL 1579 · Delta · 2h 22m · 67% on time, 0.6% cancelled
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2h 03m layover in Atlanta (ATL) · 45 min minimum on one ticket
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20:25 ATL → 21:50 ONTDL 779 · Delta · 4h 25m · 71% on time, 1.6% cancelled
Total trip 8h 50m, scheduled departure to arrival (Ontario is 3 h behind Miami). Times are local. Both flew on 42 of the last 56 days.
Makes the connection87%The first flight arrived more than 78 minutes late on 13% of the days it flew: too late for the 45-minute minimum connection on a 2h 03m layover.
Arrives on time61%First flight not cancelled (0.6% are) × connection made (87%) × second flight not cancelled (1.6% are) and within 15 minutes (71%).
Total trip8h 50mMIA 16:00 to ONT 21:50, 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.