Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Denver → San Juan via Boston: arrives on time 33%
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14:45 DEN → 20:43 BOSB6 394 · JetBlue · 3h 58m · 68% on time, 3.2% cancelled
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1h 01m layover in Boston (BOS) · 45 min minimum on one ticket
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21:44 BOS → 02:17 SJU +1 dayB6 561 · JetBlue · 4h 00m · 51% on time, 3.6% cancelled
Total trip 8h 59m, scheduled departure to arrival (San Juan is 2 h ahead of Denver). Times are local. Both flew on 51 of the last 56 days.
Makes the connection68%The first flight arrived more than 16 minutes late on 32% of the days it flew: too late for the 45-minute minimum connection on a 1h 01m layover.
Arrives on time33%First flight not cancelled (3.2% are) × connection made (68%) × second flight not cancelled (3.6% are) and within 15 minutes (51%).
Total trip8h 59mDEN 14:45 to SJU 02:17, layover included
Tight connection: often missed. The first flight is late enough to miss it on more than 1 day in 4.
Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.