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

Seattle → Boston via Detroit: arrives on time 66%

  1. 05:30 SEA → 12:40 DTW
    DL 812 · Delta · 4h 10m · 92% on time, 0.5% cancelled
  2. 1h 21m layover in Detroit (DTW) · 45 min minimum on one ticket
  3. 14:01 DTW → 16:10 BOS
    DL 1171 · Delta · 2h 09m · 70% on time, 1.1% cancelled

Total trip 7h 40m, scheduled departure to arrival (Boston is 3 h ahead of Seattle). Times are local. Both flew on 56 of the last 56 days.

Makes the connection96%The first flight arrived more than 36 minutes late on 4% of the days it flew: too late for the 45-minute minimum connection on a 1h 21m layover.
Arrives on time66%First flight not cancelled (0.5% are) × connection made (96%) × second flight not cancelled (1.1% are) and within 15 minutes (70%).
Total trip7h 40mSEA 05:30 to BOS 16:10, 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.