tailodds FORECAST
Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026

Portland → Dulles via Seattle: arrives on time 89%

  1. 08:19 PDX → 09:14 SEA
    AS 2108 · Alaska, flown by Horizon · 55m · 92% on time, 1.9% cancelled
  2. 3h 46m layover in Seattle (SEA) · 90 min minimum on separate tickets
  3. 13:00 SEA → 21:06 IAD
    UA 2131 · United · 5h 06m · 93% on time, 0.0% cancelled

Total trip 9h 47m, scheduled departure to arrival (Dulles is 3 h ahead of Portland). Times are local. Both flew on 52 of the last 56 days.

Makes the connection98%The first flight arrived more than 136 minutes late on 2% of the days it flew: too late for the 90-minute minimum connection on a 3h 46m layover.
Arrives on time89%First flight not cancelled (1.9% are) × connection made (98%) × second flight not cancelled (0.0% are) and within 15 minutes (93%).
Total trip9h 47mPDX 08:19 to IAD 21:06, 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.