Catch a flight from Chicago O'Hare to Juan Santamaría International Airport (SJO) in San José, Costa Rica. Flights are available via airlines like American Airlines and United Airlines with a flight time of around 5 hours.
Once you arrive at SJO, take a pre-booked shuttle or private transfer to Nayara Gardens in the Arenal area, which is about a 3-hour drive away. Enjoy the scenic views along the way.