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

Ontario → Chicago via Atlanta: arrives on time 67%

  1. 11:50 ONT → 19:11 ATL
    DL 665 · Delta · 4h 21m · 85% on time, 1.6% cancelled
  2. 3h 39m layover in Atlanta (ATL) · 45 min minimum on one ticket
  3. 22:50 ATL → 23:53 ORD
    DL 1199 · Delta · 2h 09m · 71% on time, 2.9% cancelled

Total trip 10h 09m, scheduled departure to arrival (Chicago is 2 h ahead of Ontario). Times are local. Both flew on 56 of the last 56 days.

Makes the connection99%The first flight arrived more than 174 minutes late on 1% of the days it flew: too late for the 45-minute minimum connection on a 3h 39m layover.
Arrives on time67%First flight not cancelled (1.6% are) × connection made (99%) × second flight not cancelled (2.9% are) and within 15 minutes (71%).
Total trip10h 09mONT 11:50 to ORD 23:53, 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.