Catch a flight from Chicago O'Hare (ORD) to Daniel Oduber Quirós International Airport (LIR) in Liberia, Costa Rica. Airlines like United and American Airlines offer flights, with a flight time of roughly 5 hours.
After arriving at LIR, take a pre-booked shuttle to Nayara Gardens in Arenal, which takes approximately 2.5 hours, allowing you to enjoy the scenic views on the way.
Private transfer back to San José for your return flight. Allow approximately 4 hours for this journey, by booking a shuttle with a reliable travel agency.