Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Dulles → Louisville via Boston: arrives on time 83%
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08:35 IAD → 10:20 BOSUA 641 · United · 1h 45m · 92% on time, 1.5% cancelled
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3h 39m layover in Boston (BOS) · 90 min minimum on separate tickets
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13:59 BOS → 16:40 SDFAA 3438 · American, flown by Envoy · 2h 41m · 84% on time, 0.0% cancelled
Total trip 8h 05m, scheduled departure to arrival. Times are local. Both flew on 40 of the last 56 days.
Makes the connection100%The first flight arrived more than 129 minutes late on <1% of the days it flew: too late for the 90-minute minimum connection on a 3h 39m layover.
Arrives on time83%First flight not cancelled (1.5% are) × connection made (100%) × second flight not cancelled (0.0% are) and within 15 minutes (84%).
Total trip8h 05mIAD 08:35 to SDF 16:40, 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.