Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Chicago → Ontario via Atlanta: arrives on time 42%
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12:50 MDW → 15:49 ATLDL 2417 · Delta · 2h 02m · 86% on time, 3.4% cancelled
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1h 10m layover in Atlanta (ATL) · 45 min minimum on one ticket
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16:59 ATL → 18:30 ONTDL 2891 · Delta · 4h 31m · 50% on time, 0.0% cancelled
Total trip 7h 40m, scheduled departure to arrival (Ontario is 2 h behind Chicago). Times are local. Both flew on 54 of the last 56 days.
Makes the connection88%The first flight arrived more than 25 minutes late on 12% of the days it flew: too late for the 45-minute minimum connection on a 1h 10m layover.
Arrives on time42%First flight not cancelled (3.4% are) × connection made (88%) × second flight not cancelled (0.0% are) and within 15 minutes (50%).
Total trip7h 40mMDW 12:50 to ONT 18:30, 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.