Calgary to New York, Miami, Los Angeles | $288 roundtrip after taxes !
http://yycdeals.com/calgary-to-new-y...ip-after-taxes
I'm not sure what exactly is going on with airfares from Calgary on United Airlines the past few days, but I'm loving it! Yesterday it was Maui, and today it's New York, Miami, and Los Angeles that are down to crazy price levels of sub-$300 roundtrip after taxes.
The easiest way to see which date combinations are cheap between now and September 2013 is by using Google Flights Explorer. In the 'To' box, enter 'United States'.
There also now appears to be fares to Maui for as cheap as $320 CAD, but all of the ones I've seen at that price level look to involve 2 stops each way.