Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Dulles → Ontario via Chicago: arrives on time 45%
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17:42 IAD → 18:50 ORDUA 2497 · United · 2h 08m · 48% on time, 1.1% cancelled
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1h 28m layover in Chicago (ORD) · 45 min minimum on one ticket
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20:18 ORD → 22:51 ONTUA 658 · United · 4h 33m · 60% on time, 2.5% cancelled
Total trip 8h 09m, scheduled departure to arrival (Ontario is 3 h behind Dulles). Times are local. Both flew on 56 of the last 56 days.
Makes the connection78%The first flight arrived more than 43 minutes late on 22% of the days it flew: too late for the 45-minute minimum connection on a 1h 28m layover.
Arrives on time45%First flight not cancelled (1.1% are) × connection made (78%) × second flight not cancelled (2.5% are) and within 15 minutes (60%).
Total trip8h 09mIAD 17:42 to ONT 22:51, 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.