Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Dulles → Ontario via Atlanta: arrives on time 46%
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12:37 IAD → 14:34 ATLDL 1444 · Delta · 1h 56m · 83% on time, 3.6% cancelled
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2h 25m 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 8h 53m, scheduled departure to arrival (Ontario is 3 h behind Dulles). Times are local. Both flew on 54 of the last 56 days.
Makes the connection96%The first flight arrived more than 100 minutes late on 4% of the days it flew: too late for the 45-minute minimum connection on a 2h 25m layover.
Arrives on time46%First flight not cancelled (3.6% are) × connection made (96%) × second flight not cancelled (0.0% are) and within 15 minutes (50%).
Total trip8h 53mIAD 12:37 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.