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

Boston → St Louis via Denver: arrives on time 43%

  1. 16:57 BOS → 19:45 DEN
    UA 800 · United · 4h 48m · 75% on time, 1.1% cancelled
  2. 1h 00m layover in Denver (DEN) · 45 min minimum on one ticket
  3. 20:45 DEN → 23:57 STL
    UA 214 · United · 2h 12m · 58% on time, 0.0% cancelled

Total trip 8h 00m, scheduled departure to arrival (St Louis is 1 h behind Boston). Times are local. Both flew on 55 of the last 56 days.

Makes the connection75%The first flight arrived more than 15 minutes late on 25% of the days it flew: too late for the 45-minute minimum connection on a 1h 00m layover.
Arrives on time43%First flight not cancelled (1.1% are) × connection made (75%) × second flight not cancelled (0.0% are) and within 15 minutes (58%).
Total trip8h 00mBOS 16:57 to STL 23:57, 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.