Friday, October 9 · typical odds for a Friday (too early for a weather forecast) · issued Sun 4:00 PM ET · connections flying that day

Fri, Oct 9: Delta via Atlanta, leaving 06:05, is the safest bet: 81% chance of reaching Chicago on time.

Best connections that day, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Chicago on time, from each leg’s forecast for the day. Total trip = scheduled departure to arrival. Layovers up to 4 hours. Pick a connection for its 12-month details.


Delta Details →	DAL 06:05 → ATL 09:17DL 516	2h 05m Atlanta	ATL 11:22 → ORD 12:34DL 2894	6h 29m	98%	81%
Delta Details →	DAL 15:59 → ATL 19:14DL 512	3h 26m Atlanta	ATL 22:40 → ORD 23:53DL 1199	7h 54m	98%	80%
Delta Details →	DAL 10:07 → ATL 13:16DL 441	2h 34m Atlanta	ATL 15:50 → ORD 17:12DL 2738	7h 05m	99%	73%
Delta Details →	DAL 12:19 → ATL 15:31DL 1115	3h 44m Atlanta	ATL 19:15 → ORD 20:33DL 2486	8h 14m	98%	67%

How these are worked out. Each flight’s odds are our forecast for that day (typical odds until the weather forecast covers it); flights of airlines we don’t forecast yet use their 12-month record and are marked. Makes the connection: the first flight’s 12-month lateness curve, scaled so its chance of arriving 15+ min late matches the day’s forecast, at the layover minus the 45-minute minimum (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled × second flight within 15 minutes, each from the day’s forecast.

About this data: forecast odds from our model for Fri, Oct 9 (newest published update); 12-month records from US DOT on-time data, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. JSON