United Airlines Flights from San Francisco to San Juan

United Airlines on this route

San Francisco is a United Airlines hub, so United Airlines typically offers several daily departures on SFO–SJU, with nonstop service where demand supports it and connections through its other hubs otherwise. The nonstop flight time is about 7h 33m.

Fare classes available: Basic Economy, Economy, Economy Plus, Premium Plus / First / Polaris. United has no change fees on Economy and above for travel within the US or between the US and Mexico, the Caribbean, or international destinations originating in the US. Fare difference applies.

Recorded lows on SFO–SJU start at $357 one-way. That figure comes from cached search data and moves with demand, so treat it as a benchmark for what a good price looks like rather than a guaranteed fare.

Delta Air Lines and United Airlines both operate hubs at one end of this route, so nonstop or single-connection service is usually available, along with American Airlines and Southwest Airlines. Our agents can book any of them and compare fare classes side by side.

Covering 3,625 miles, the flight runs around 7h 33m nonstop. On sectors this long, one-stop itineraries through a hub are often priced well below the nonstop and add only a few hours; the agent will show both.

When to fly

West Coast and Mountain departures spike over summer holidays and the December break; January (after New Year), late April, May, and September are usually the cheapest windows.

Midweek travel almost always beats weekends on price here. If your dates are flexible by a day or two, tell the agent; shifting a Friday departure to Thursday or a Sunday return to Monday is the single most reliable way to cut the fare.

For domestic travel, booking three to eight weeks ahead usually captures the best price. Inside two weeks, fares climb; more than four months out, airlines have not yet released their cheapest inventory.