In general when looking for the cheapest flight to Buenos Aires, try to book your flight during the month of May for the best deal.
In general, most flyers find the cheapest time to book a flight to Buenos Aires is about 60 days prior.
From most locations, the cheapest day to fly to Buenos Aires is Monday. Most users found that departing on a Saturday was most expensive.
Generally, when visiting Buenos Aires, afternoon flights represent the best value. noon flights are likely to have higher prices.