Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Dulles → Ontario via Seattle: arrives on time 81%
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13:10 IAD → 15:55 SEAUA 2241 · United · 5h 45m · 86% on time, 0.0% cancelled
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3h 55m layover in Seattle (SEA) · 90 min minimum on separate tickets
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19:50 SEA → 22:41 ONTDL 3884 · Delta, flown by SkyWest · 2h 51m · 84% on time, 0.0% cancelled
Total trip 12h 31m, scheduled departure to arrival (Ontario is 3 h behind Dulles). Times are local. Both flew on 56 of the last 56 days.
Makes the connection97%The first flight arrived more than 145 minutes late on 3% of the days it flew: too late for the 90-minute minimum connection on a 3h 55m layover.
Arrives on time81%First flight not cancelled (0.0% are) × connection made (97%) × second flight not cancelled (0.0% are) and within 15 minutes (84%).
Total trip12h 31mIAD 13:10 to ONT 22:41, 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.