Tuesday, October 6 · our forecast odds · issued Mon 6:00 AM ET · connections flying that day

Tomorrow looks like a normal day here: all 2 nonstops are 10–12% likely to arrive 15+ min late.

Nonstops that day


WN 3131 Southwest	PDX 23:20	MDW 05:18	10%	3%	0.6%	no record
WN 3130 Southwest	PDX 11:04	MDW 17:04	12%	2%	0.5%	no record

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 2 h ahead of Portland). Layovers up to 4 hours. Pick a connection for its 12-month details.


Delta Details →	PDX 11:37 → ATL 19:21DL 539	1h 54m Atlanta	ATL 21:15 → MDW 22:15DL 1076	8h 38m	98%	84%
Delta Details →	PDX 06:35 → ATL 14:14DL 662	1h 01m Atlanta	ATL 15:15 → MDW 16:15DL 1728	7h 40m	95%	84%
Delta Details →	PDX 00:33 → MSP 05:49DL 2359	1h 06m Minneapolis	MSP 06:55 → MDW 08:37DL 4712 · flown by Endeavor	6h 04m	97%	81%

How these are worked out. Each flight’s odds are our forecast for that day; 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 Tue, Oct 6 (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