Tuesday, October 6 · our forecast odds · issued Sun 8:00 PM ET · connections flying that day

Tue, Oct 6: Delta via Atlanta, leaving 12:02, is the safest bet: 87% chance of reaching San Juan on time.

Nonstops that day


UA 1339 United Flight history →	DEN 09:43	SJU 17:38	11%	3%	0.6%	84%

Best connections that day, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach San Juan on time, from each leg’s forecast for the day. Total trip = scheduled departure to arrival (San Juan is 2 h ahead of Denver). Layovers up to 4 hours. Pick a connection for its 12-month details.


United Details →	DEN 00:05 → IAD 05:48UA 1924	2h 46m Dulles	IAD 08:34 → SJU 12:34UA 2021	10h 29m	100%	92%
United Details →	DEN 07:42 → IAH 11:15UA 1720	3h 48m Houston	IAH 15:03 → SJU 20:38UA 701	10h 56m	100%	88%
Delta Details →	DEN 10:52 → ATL 15:52DL 346	2h 53m Atlanta	ATL 18:45 → SJU 22:30DL 1861	9h 38m	100%	87%
Delta Details →	DEN 05:45 → ATL 10:44DL 341	2h 16m Atlanta	ATL 13:00 → SJU 16:39DL 1946	8h 54m	99%	86%
United Details →	DEN 00:12 → EWR 06:12UA 1745	1h 48m Newark	EWR 08:00 → SJU 12:04UA 2143	9h 52m	99%	84%
United Details →	DEN 05:00 → IAH 08:32UA 320	1h 31m Houston	IAH 10:03 → SJU 15:42UA 1192	8h 42m	99%	84%
Delta Details →	DEN 12:10 → JFK 18:25DL 532	1h 04m New York	JFK 19:29 → SJU 23:53DL 1859	9h 43m	93%	82%
United Details →	DEN 09:58 → EWR 16:00UA 2381	3h 45m Newark	EWR 19:45 → SJU 23:50UA 1543	11h 52m	99%	74%

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