Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
San Juan → Detroit via New York: arrives on time 59%
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13:10 SJU → 17:19 JFKDL 1966 · Delta · 4h 09m · 85% on time, 2.3% cancelled
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2h 10m layover in New York (JFK) · 45 min minimum on one ticket
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19:29 JFK → 21:56 DTWDL 1253 · Delta · 2h 27m · 71% on time, 11.6% cancelled
Total trip 8h 46m, scheduled departure to arrival. Times are local. Both flew on 56 of the last 56 days.
Makes the connection96%The first flight arrived more than 85 minutes late on 4% of the days it flew: too late for the 45-minute minimum connection on a 2h 10m layover.
Arrives on time59%First flight not cancelled (2.3% are) × connection made (96%) × second flight not cancelled (11.6% are) and within 15 minutes (71%).
Total trip8h 46mSJU 13:10 to DTW 21:56, 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.