In article ,
W wrote:
Is there a web site that will search for the cheapest international flights
from US to South America that are conditioned by arrival/destination points
and NOT specifying exact departure or return dates? Expedia will only work
with a date range for US domestic flights.

Try ITA at www.itasoftware.com

They write the search engine used by Orbitz and others, and were
recently bought by Google. Their own site is a live demo of the
software, doesn't sell tickets but is great for finding what's
available to where when.

R's,
John