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

Portland → Ontario via Seattle: arrives on time 87%

  1. 09:30 PDX → 10:55 SEA
    DL 3953 · Delta, flown by SkyWest · 1h 25m · 85% on time, 0.5% cancelled
  2. 3h 40m layover in Seattle (SEA) · 45 min minimum on one ticket
  3. 14:35 SEA → 17:19 ONT
    DL 4031 · Delta, flown by SkyWest · 2h 44m · 88% on time, 0.3% cancelled

Total trip 7h 49m, scheduled departure to arrival. Times are local. Both flew on 55 of the last 56 days.

Makes the connection99%The first flight arrived more than 175 minutes late on 1% of the days it flew: too late for the 45-minute minimum connection on a 3h 40m layover.
Arrives on time87%First flight not cancelled (0.5% are) × connection made (99%) × second flight not cancelled (0.3% are) and within 15 minutes (88%).
Total trip7h 49mPDX 09:30 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.