ha! you sure know how to pick your cities for budget air travel! ;-)
in all seriousness, it's not going to be cheap...there really isn't much demand for such a route and the airlines know that...and thus the ridiculous airfares. quick search on some intl airfare databases show fares of roughly US$1100 from ushuaia to quito. you could in theory cut that drastically by hopping across the border to punta arenas and flying from there which shows675. flying from buenos aires or santiago still comes out to over500. hope this helps,
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