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

Chicago → Miami via Atlanta: arrives on time 47%

  1. 11:05 MDW → 14:01 ATL
    DL 1063 · Delta · 1h 56m · 90% on time, 2.7% cancelled
  2. 3h 44m layover in Atlanta (ATL) · 45 min minimum on one ticket
  3. 17:45 ATL → 19:56 MIA
    DL 1631 · Delta · 2h 11m · 51% on time, 3.6% cancelled

Total trip 7h 51m, scheduled departure to arrival (Miami is 1 h ahead of Chicago). Times are local. Both flew on 55 of the last 56 days.

Makes the connection99%The first flight arrived more than 179 minutes late on 1% of the days it flew: too late for the 45-minute minimum connection on a 3h 44m layover.
Arrives on time47%First flight not cancelled (2.7% are) × connection made (99%) × second flight not cancelled (3.6% are) and within 15 minutes (51%).
Total trip7h 51mMDW 11:05 to MIA 19:56, 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.