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

Boston → St Louis via Denver: arrives on time 91%

  1. 06:25 BOS → 08:50 DEN
    WN 4156 · Southwest · 4h 25m · 88% on time, 0.0% cancelled
  2. 1h 15m layover in Denver (DEN) · 45 min minimum on one ticket
  3. 10:05 DEN → 13:20 STL
    WN 1753 · Southwest · 2h 15m · 96% on time, 0.0% cancelled

Total trip 7h 55m, scheduled departure to arrival (St Louis is 1 h behind Boston). Times are local. Both flew on 47 of the last 56 days.

Makes the connection95%The first flight arrived more than 30 minutes late on 5% of the days it flew: too late for the 45-minute minimum connection on a 1h 15m layover.
Arrives on time91%First flight not cancelled (0.0% are) × connection made (95%) × second flight not cancelled (0.0% are) and within 15 minutes (96%).
Total trip7h 55mBOS 06:25 to STL 13:20, 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.