What is a good website for cheap flights to argentina and spain?

I have used search engines but the flights in april are about $1000. Please suggest a airline or website.What is a good website for cheap flights to argentina and spain?
You can try this site

http://freetravel4ever.blogspot.com
If you're departing from the US or Canada, try the online airfare search engine listed below.



For flights to Spain, Iberia frequently has sales on its website. Finding cheap flights to Argentina is more difficult as few airlines fly to and within Latin America. Do a search on AirBank's booking engine for the airlines that fly to where you want to go in Argentina, and then try the individual airline's websites - you may find a sale or special offer.What is a good website for cheap flights to argentina and spain?
Please check:

Tips:

a- use flexible dates

b- use alternative airports



http://www.hotwire.com/



http://www.cheapoair.com/



http://www.kayak.com/



http://www.orbitz.com/



http://www.priceline.com/



http://www.expedia.com/default.asp



http://www.farecompare.com/



http://www.bing.com/travel/



http://www.airfarewatchdog.com/



http://www.cheapair.com/
try kayak.com, travel zoo.com and cheapflights.com. most importantly check out the websites of diffrent airlines, as they sometimes have the lowest prices on their website. delta.com is a great place to begin.....
See http://www.travelbargainsites.com for good travel sites.
How about taking a look at dohop.com? I like them best for international flights.