San Francisco International to Luis Muñoz Marín
3625 miles great-circle distance, typically flown in 7h 42m with 10 airlines operating direct service from San Francisco International (SFO) to Luis Muñoz Marín (SJU). Cheapest fares are usually in Jun (around $205 return), with peak prices in Jun (around $205). Departures on a Tuesday tend to undercut weekend prices on this corridor.
Flying from San Francisco International
San Francisco International is United's main Pacific hub and Alaska Airlines' largest non-Seattle base. Four terminals form a single ring connected by the AirTrain shuttle, with BART running from the dedicated airport station directly to Powell Street downtown in around 30 minutes for $10. Heavy fog from May through August causes chronic morning delays — book mid-day departures during summer where possible. International long-haul to Asia and Europe is the deepest on the West Coast.
Arriving in San Juan
San Juan's Luis Muñoz Marín is the busiest airport in the Caribbean and Puerto Rico's primary international gateway. The airport is 8 km east of Old San Juan; AMA bus T5 runs from the airport, but most travellers use rideshare or taxi (~$25 to Old San Juan). US domestic-status flights (no passport required for US citizens) make San Juan one of the easiest Caribbean destinations from any US hub.
Who flies SFO to SJU?
| Airline | IATA | Flight time | Cabin |
| United Airlines | UA | 7h 42m | Economy |
| Singapore Airlines | SQ | 7h 42m | Economy |
| Cathay Pacific | CX | 7h 42m | Economy |
| ANA | NH | 7h 42m | Economy |
| Japan Airlines | JL | 7h 42m | Economy |
| Air France | AF | 7h 42m | Economy |
| Lufthansa | LH | 7h 42m | Economy |
| British Airways | BA | 7h 42m | Economy |
| Qantas | QF | 7h 42m | Economy |
| Emirates | EK | 7h 42m | Economy |
10 carriers fly direct on this corridor. Frequencies vary by season — summer and winter holiday peaks see additional flights.
Best time to fly SFO→SJU
Synthesised from 12-month price aggregates. Cheapest months in green, peak in red.
Estimated baseline. Prices update on a 30-day cadence as Travelpayouts data refreshes. Cheapest day-of-week typically Tuesday.
San Francisco to San Juan FAQs
Direct flights from San Francisco International (SFO) to Luis Muñoz Marín (SJU) take approximately 7h 42m for the 3625-mile journey, plus 30–60 minutes of taxi, climb and descent. Total airport-to-airport time depends on cruise winds and air-traffic queueing on approach.
Jun is typically the cheapest month on this route, with one-way fares from $205. Jun is the peak — expect prices 2–3× higher. Book 4–8 weeks ahead for best fares; last-minute prices on this corridor rise sharply inside two weeks of departure.
10 carriers operate direct service from San Francisco International (SFO) to Luis Muñoz Marín (SJU): United Airlines, Singapore Airlines, Cathay Pacific, ANA, Japan Airlines and 5 more. Frequencies vary by season and carrier — United Airlines typically operates the highest weekly count on this corridor.
No — Puerto Rico is domestic travel for US citizens. A US passport is not required for the 50 states, DC or US territories (Puerto Rico, US Virgin Islands, Guam, American Samoa, Northern Mariana Islands), though Real ID-compliant ID is required at TSA from May 2025.
Luis Muñoz Marín (SJU) is the primary international airport for San Juan. Allow 30–60 minutes for the ground transfer by train, express bus, taxi or rideshare depending on traffic and time of day. See the airport's official website for current train and shuttle timetables.