Saturday, October 10 · typical odds for a Saturday (too early for a weather forecast) · issued Mon 4:00 PM ET · connections flying that day

Sat, Oct 10: Delta via Atlanta, leaving 05:17, is the safest bet: 76% chance of reaching San Juan on time.

Nonstops that day

All 1 nonstop →


DL 1913 Delta Flight history →	DTW 08:35	SJU 13:11	17%	4%	0.6%	76%

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. Layovers up to 4 hours. Pick a connection for its 12-month details.


Delta Details →	DTW 06:17 → ATL 08:11DL 1611	1h 34m Atlanta	ATL 09:45 → SJU 13:32DL 1882	7h 15m	97%	77%
American Details →	DTW 06:03 → PHL 07:52AA 5414 · flown by PSA	1h 42m Philadelphia	PHL 09:34 → SJU 13:42AA 614	7h 39m	100%	77%
Delta Details →	DTW 07:20 → ATL 09:18DL 965	3h 42m Atlanta	ATL 13:00 → SJU 16:39DL 1946	9h 19m	99%	76%
Delta Details →	DTW 05:17 → ATL 07:10DL 2375	59m Atlanta	ATL 08:09 → SJU 11:52DL 1930	6h 35m	91%	76%
Delta Details →	DTW 14:43 → ATL 16:56DL 1983	1h 49m Atlanta	ATL 18:45 → SJU 22:29DL 1861	7h 46m	98%	75%
Frontier Details →	DTW 16:35 → MCO 19:17F9 2530	4h 00m Orlando	MCO 23:17 → SJU 02:15 +1F9 4726	9h 40m	98%	73%
American Details →	DTW 06:00 → MIA 09:06AA 1020	2h 12m Miami	MIA 11:18 → SJU 14:07AA 1613	8h 07m	96%	73%
American Details →	DTW 06:00 → CLT 07:51AA 387	3h 12m Charlotte	CLT 11:03 → SJU 14:50AA 783	8h 50m	96%	69%

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