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

Dulles → Ontario via Seattle: arrives on time 87%

  1. 09:00 IAD → 11:51 SEA
    UA 2101 · United · 5h 51m · 91% on time, 0.0% cancelled
  2. 2h 44m layover in Seattle (SEA) · 90 min minimum on separate tickets
  3. 14:35 SEA → 17:19 ONT
    DL 4031 · Delta, flown by SkyWest · 2h 44m · 88% on time, 0.3% cancelled

Total trip 11h 19m, scheduled departure to arrival (Ontario is 3 h behind Dulles). Times are local. Both flew on 49 of the last 56 days.

Makes the connection99%The first flight arrived more than 74 minutes late on 1% of the days it flew: too late for the 90-minute minimum connection on a 2h 44m layover.
Arrives on time87%First flight not cancelled (0.0% are) × connection made (99%) × second flight not cancelled (0.3% are) and within 15 minutes (88%).
Total trip11h 19mIAD 09:00 to ONT 17:19, 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.