Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Juan → Detroit via Boston: arrives on time 53%
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14:05 SJU → 18:14 BOSDL 1780 · Delta · 4h 09m · 80% on time, 0.9% cancelled
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2h 51m layover in Boston (BOS) · 45 min minimum on one ticket
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21:05 BOS → 23:21 DTWDL 2896 · Delta · 2h 16m · 56% on time, 2.9% cancelled
Total trip 9h 16m, scheduled departure to arrival. Times are local. Both flew on 43 of the last 56 days.
Makes the connection98%The first flight arrived more than 126 minutes late on 2% of the days it flew: too late for the 45-minute minimum connection on a 2h 51m layover.
Arrives on time53%First flight not cancelled (0.9% are) × connection made (98%) × second flight not cancelled (2.9% are) and within 15 minutes (56%).
Total trip9h 16mSJU 14:05 to DTW 23:21, 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.