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

Dulles → St Louis via Chicago: arrives on time 34%

  1. 17:42 IAD → 18:50 ORD
    UA 2497 · United · 2h 08m · 48% on time, 1.1% cancelled
  2. 1h 05m 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 4h 44m, scheduled departure to arrival (St Louis is 1 h behind Dulles). Times are local. Both flew on 56 of the last 56 days.

Makes the connection56%The first flight arrived more than 20 minutes late on 44% of the days it flew: too late for the 45-minute minimum connection on a 1h 05m layover.
Arrives on time34%First flight not cancelled (1.1% are) × connection made (56%) × second flight not cancelled (0.0% are) and within 15 minutes (61%).
Total trip4h 44mIAD 17:42 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.