tailodds FORECAST
Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026

Boston → San Juan via Detroit: arrives on time 69%

  1. 05:30 BOS → 07:39 DTW
    DL 1019 · Delta · 2h 09m · 95% on time, 2.5% cancelled
  2. 56m layover in Detroit (DTW) · 45 min minimum on one ticket
  3. 08:35 DTW → 13:04 SJU
    DL 1913 · Delta · 4h 29m · 76% on time, 0.7% cancelled

Total trip 7h 34m, scheduled departure to arrival. Times are local. Both flew on 56 of the last 56 days.

Makes the connection94%The first flight arrived more than 11 minutes late on 6% of the days it flew: too late for the 45-minute minimum connection on a 56m layover.
Arrives on time69%First flight not cancelled (2.5% are) × connection made (94%) × second flight not cancelled (0.7% are) and within 15 minutes (76%).
Total trip7h 34mBOS 05:30 to SJU 13:04, 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.