A natural rock arch formation in turquoise waters with a mountainous backdrop.

$944 Cheap Flights from Boston (BOS) to Posadas (PSS)

View $944 flight on Sat, Sep 12, 2026Opens in a new window

Popular airlines from Logan International Airport (BOS) to Posadas (PSS-Libertador General Jose de San Martin)

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 30% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Boston to Posadas (BOS-PSS)

Prices were available within the past 7 days and start at $944 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.