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

Denver → Buffalo via Dulles: arrives on time 61%

  1. 15:40 DEN → 21:11 IAD
    UA 421 · United · 3h 31m · 71% on time, 0.0% cancelled
  2. 1h 15m layover in Dulles (IAD) · 45 min minimum on one ticket
  3. 22:26 IAD → 23:59 BUF
    UA 3516 · United, flown by Republic · 1h 33m · 84% on time, 9.5% cancelled

Total trip 6h 19m, scheduled departure to arrival (Buffalo is 2 h ahead of Denver). Times are local. Both flew on 32 of the last 56 days.

Makes the connection81%The first flight arrived more than 30 minutes late on 19% of the days it flew: too late for the 45-minute minimum connection on a 1h 15m layover.
Arrives on time61%First flight not cancelled (0.0% are) × connection made (81%) × second flight not cancelled (9.5% are) and within 15 minutes (84%).
Total trip6h 19mDEN 15:40 to BUF 23:59, 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.