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

Boston → St Louis via Chicago: arrives on time 29%

  1. 17:00 BOS → 19:00 ORD
    UA 2040 · United · 3h 00m · 55% on time, 2.5% cancelled
  2. 55m layover in Chicago (ORD) · 45 min minimum on one ticket
  3. 19:55 ORD → 21:26 STL
    UA 2144 · United · 1h 31m · 61% on time, 0.0% cancelled

Total trip 5h 26m, 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 connection49%The first flight arrived more than 10 minutes late on 51% of the days it flew: too late for the 45-minute minimum connection on a 55m layover.
Arrives on time29%First flight not cancelled (2.5% are) × connection made (49%) × second flight not cancelled (0.0% are) and within 15 minutes (61%).
Total trip5h 26mBOS 17:00 to STL 21:26, 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.