THIS SALE IS OVER. It came and went on Saturday. So check our site on Saturday, how many times do we gotta tell you!
Delta and United are having a big fare war sale to Buenos Aires for year-round travel. Delta has $540 RT including tax from Denver and Washington Dulles (other airlines charging $1200 or more); in retaliation, United has Atlanta or Cincinnati to BA for that same low fare. These fares are incredible bargains since Buenos Aires seldom goes on sale these days. No matter where you live in the US, if you want to visit Argentina then definitely head to one of these hub airports on a separate fare and then hop on Delta or United for the onward journey to BA. You'll definitely save money buying two separate fares. See a booking example below: