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: JetBlue via Charlotte Amalie, leaving 08:55, is the safest bet: 46% chance of reaching San Juan on time; the tightest one-ticket connections make it only 60% of the time.

Nonstops that day

All 2 nonstops →


DL 1780 Delta Flight history →	BOS 08:51	SJU 12:58	18%	4%	0.7%	78%
B6 861 JetBlue Flight history →	BOS 09:10	SJU 13:11	30%	7%	0.8%	75%

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.


United Details →	BOS 05:45 → IAD 07:23UA 1734	1h 11m Dulles	IAD 08:34 → SJU 12:34UA 2021	6h 49m	97%	82%
Delta Details →	BOS 05:30 → ATL 08:21DL 2242	1h 24m Atlanta	ATL 09:45 → SJU 13:32DL 1882	8h 02m	100%	80%
Delta Details →	BOS 05:30 → DTW 07:38DL 1019	57m Detroit	DTW 08:35 → SJU 13:11DL 1913	7h 41m	95%	79%
Delta Details →	BOS 12:30 → ATL 15:21DL 2779	3h 24m Atlanta	ATL 18:45 → SJU 22:29DL 1861	9h 59m	100%	77%
Delta Details →	BOS 06:45 → ATL 09:34DL 695	3h 26m Atlanta	ATL 13:00 → SJU 16:39DL 1946	9h 54m	99%	76%
American Details →	BOS 05:10 → MIA 08:38AA 1418	2h 40m Miami	MIA 11:18 → SJU 14:07AA 1613	8h 57m	100%	76%
American Details →	BOS 06:03 → PHL 07:45AA 1540	1h 49m Philadelphia	PHL 09:34 → SJU 13:42AA 614	7h 39m	97%	75%
American Details →	BOS 06:05 → CLT 08:30AA 418	2h 33m Charlotte	CLT 11:03 → SJU 14:50AA 783	8h 45m	97%	70%
Tight connection: often missed
Delta Details →	BOS 17:05 → JFK 18:42DL 5814 · flown by Republic	47m New York	JFK 19:29 → SJU 23:53DL 1859	6h 48m	60%	45%

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