Book with Porter Airlines Canada by 11:59 PM EST on March 21st, 2014 and you will be able to save up to 50% off base fares! You can travel anytime from now until July 30th, 2014 but you must book by midnight on March 21st, 2014.
Some trips may require 21 day advanced purchase and the advertised Porter Airline Canada prices may be different on the following days: April 18th to 21st, May 16th to 19th, June 27th to July 1st. The 50% off discount from Porter Airlines Canada is not applied to the fees, taxes and/or surcharges.
The Return Fare from Porter Airline seems to be more expensive then the original fare.. some return fares are cheaper from Air Canada Airlines, so you may want to shop around for return tickets.