cheap flight with flexible dates

Cheapest Flights to South America?
Traveling to SA next year, from Dublin. Where is the cheapest place to fly into? With which company? I am prepared to fly from London if it would be considerable cheaper? I am very flexible on my route, and date that I go. Is there any time of year of that is particularly cheap? Finally, as I will be traveling around the whole continent, would it be cheaper to book two one-way flights, from and to different destinations, or do some companies let you change your return point, or is this much more expensive? From what I’ve seen it is, with multi-route flights. Any help would be very much appreciated. Thanks a mil!
I’ve always been able to find the best deals on flights at expedia.com- compare rates to your destination at these sites. Good luck and have a great trip!!
http://www.expedia.com/
http://www.travelocity.com/
http://www.priceline.com/
Have a good flight – Flexible use of airspace
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