Saturday, October 10 · typical odds for a Saturday (too early for a weather forecast) · issued Sun 8:00 PM ET · connections flying that day

Sat, Oct 10: Delta via Atlanta, leaving 14:30, is the safest bet: 60% 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 (Chicago is 1 h ahead of Bozeman). Layovers up to 4 hours. Pick a connection for its 12-month details.


Delta Details →	BZN 14:30 → ATL 20:27DL 406	48m Atlanta	ATL 21:15 → MDW 22:15DL 1076	6h 45m	76%	60%
Delta Details →	BZN 06:00 → MSP 09:11DL 1678	2h 19m Minneapolis	MSP 11:30 → MDW 13:09DL 4820 · flown by Endeavor	6h 09m	98%	58%

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 Sat, Oct 10 (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