From most locations, the cheapest flights to Buenos Aires can be found during the month of May; however great deals can be found at other times.
Most flyers found that booking flight tickets 60 days in advance of their planned departure date is, on average, the best time to get cheap flights to Buenos Aires.
In general, booking your departure to Buenos Aires for a Wednesday represents the best deal on airfare. Try to avoid a Saturday departure to stay away from the highest prices.
Generally, when visiting Buenos Aires, midday flights represent the best value. morning flights are likely to have higher prices.