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

Boston → Seattle via Denver: arrives on time 8%

  1. 17:30 BOS → 20:10 DEN
    WN 742 · Southwest · 4h 40m · 29% on time, 0.0% cancelled
  2. 1h 00m layover in Denver (DEN) · 45 min minimum on one ticket
  3. 21:10 DEN → 23:10 SEA
    WN 3856 · Southwest · 2h 55m · 28% on time, 0.0% cancelled

Total trip 8h 35m, scheduled departure to arrival (Seattle is 3 h behind Boston). Times are local. Both flew on 39 of the last 56 days.

Makes the connection29%The first flight arrived more than 15 minutes late on 71% of the days it flew: too late for the 45-minute minimum connection on a 1h 00m layover.
Arrives on time8%First flight not cancelled (0.0% are) × connection made (29%) × second flight not cancelled (0.0% are) and within 15 minutes (28%).
Total trip8h 35mBOS 17:30 to SEA 23:10, 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.