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: United via Dulles, leaving 06:15, is the safest bet: 82% chance of reaching San Juan on time.

Nonstops that day

All 1 nonstop →


B6 635 JetBlue Flight history →	BUF 07:00	SJU 11:35	13%	5%	0.9%	85%

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 →	BUF 06:00 → ATL 08:05DL 2664	1h 40m Atlanta	ATL 09:45 → SJU 13:32DL 1882	7h 32m	98%	84%
United Details →	BUF 06:15 → IAD 07:34UA 3668 · flown by Republic	1h 00m Dulles	IAD 08:34 → SJU 12:34UA 2021	6h 19m	95%	82%
American Details →	BUF 05:20 → PHL 06:46AA 5873 · flown by Piedmont	2h 42m Philadelphia	PHL 09:28 → SJU 13:33AA 903	8h 13m	98%	81%
American Details →	BUF 06:01 → CLT 08:01AA 1204	3h 02m Charlotte	CLT 11:03 → SJU 14:50AA 783	8h 49m	98%	79%
United Details →	BUF 10:57 → ORD 11:57UA 705	2h 41m Chicago	ORD 14:38 → SJU 20:34UA 695	9h 37m	98%	79%
Delta Details →	BUF 10:00 → JFK 11:24DL 5426 · flown by Endeavor	1h 21m New York	JFK 12:45 → SJU 16:38DL 1961	6h 38m	93%	78%
United Details →	BUF 06:00 → EWR 07:25UA 3420 · flown by Republic	2h 21m Newark	EWR 09:46 → SJU 13:45UA 1556	7h 45m	99%	78%
Delta Details →	BUF 06:29 → DTW 07:42DL 2898	53m Detroit	DTW 08:35 → SJU 13:11DL 1913	6h 42m	88%	76%

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