Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Miami → Ontario via Seattle: arrives on time 87%
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08:20 MIA → 11:56 SEAAA 654 · American · 6h 36m · 94% on time, 0.0% cancelled
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2h 39m layover in Seattle (SEA) · 90 min minimum on separate tickets
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14:35 SEA → 17:19 ONTDL 4031 · Delta, flown by SkyWest · 2h 44m · 88% on time, 0.3% cancelled
Total trip 11h 59m, scheduled departure to arrival (Ontario is 3 h behind Miami). Times are local. Both flew on 55 of the last 56 days.
Makes the connection99%The first flight arrived more than 69 minutes late on 1% of the days it flew: too late for the 90-minute minimum connection on a 2h 39m layover.
Arrives on time87%First flight not cancelled (0.0% are) × connection made (99%) × second flight not cancelled (0.3% are) and within 15 minutes (88%).
Total trip11h 59mMIA 08:20 to ONT 17:19, 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.