Seattle-Tacoma to Luis Muñoz Marín
3726 miles great-circle distance, typically flown in 7h 54m with 8 airlines operating direct service from Seattle-Tacoma (SEA) to Luis Muñoz Marín (SJU). Cheapest fares are usually in January (around $449 return), with peak prices in August (around $1347). Departures on a Tuesday tend to undercut weekend prices on this corridor.
Flying from Seattle-Tacoma
Seattle-Tacoma is Alaska Airlines' principal hub and Delta's growing Pacific Northwest base. The Link Light Rail Red Line runs from the airport's elevated station directly to Westlake in downtown Seattle in 38 minutes for $3.25 — possibly the easiest big-city transfer in the country. International long-haul has expanded sharply post-2023 with new direct service to Tokyo, Seoul, Frankfurt, London Heathrow and Auckland. Weather delays are rare; SEA is one of the most operationally reliable winter airports in the US.
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 SEA to SJU?
| Airline | IATA | Flight time | Cabin |
| Alaska Airlines | AS | 7h 54m | Economy |
| Delta Air Lines | DL | 7h 54m | Economy |
| British Airways | BA | 7h 54m | Economy |
| Lufthansa | LH | 7h 54m | Economy |
| Korean Air | KE | 7h 54m | Economy |
| ANA | NH | 7h 54m | Economy |
| Japan Airlines | JL | 7h 54m | Economy |
| Emirates | EK | 7h 54m | Economy |
8 carriers fly direct on this corridor. Frequencies vary by season — summer and winter holiday peaks see additional flights.
Best time to fly SEA→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.
Seattle to San Juan FAQs
Direct flights from Seattle-Tacoma (SEA) to Luis Muñoz Marín (SJU) take approximately 7h 54m for the 3726-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.
January is typically the cheapest month on this route, with one-way fares from $449. August 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.
8 carriers operate direct service from Seattle-Tacoma (SEA) to Luis Muñoz Marín (SJU): Alaska Airlines, Delta Air Lines, British Airways, Lufthansa, Korean Air and 3 more. Frequencies vary by season and carrier — Alaska 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.