Amsterdam is 4 hours ahead of Buenos Aires during European winter (CET), and 5 hours ahead during summer (CEST). When it's 9:00 AM in Buenos Aires, it's 1:00 PM or 2:00 PM in Amsterdam.
Argentina uses ART (UTC-3) year-round and doesn't observe DST.
Optimal window: 1:00 PM - 6:00 PM Amsterdam time (9:00 AM - 2:00 PM Buenos Aires). Afternoon calls from Amsterdam reach morning business hours in Buenos Aires.
KLM operates direct flights between Amsterdam and Buenos Aires Ezeiza International Airport.