Landscapes are lovely all year round, but hiking around Aconcagua is possible only in summer. The road across the border to Chile is often blocked by snow in winter. Skiing at Las Leñas is possible from June to October.
NB, please do not rely solely on this information for your travel planning.
For information on international travel to Buenos Aires, see our guide on getting to Argentina.
From Buenos Aires: see LATAM and Aerolineas Argentinas.
It’s worth hiring a car if you want to explore the whole of the western region independently, but if you just want to tour the wineries, it’s more relaxing to book a guide and vehicle for a couple of days - or borrow a bike from your hotel!