Porter, WestJet and Air Canada: 30% Off Select Canadian/North American Flights, Book by June 1

Here we go again - our favourite flight deal trio is back today with another set of promo codes for 30% off select flights. Book now, and you can get save on flights from Air Canada, Porter and WestJet.

Here's how to claim your discount:

Porter Airlines: Use promo code CIRCUS when booking any flight.
WestJet.com: Enter the promo code PCR77 with the coupon code ZX862WA when booking select Canadian flights.
AirCanada.com: Enter the promo code CF7EKD21 when booking Tango or Tango Plus fares for select North American destinations.

All codes are valid until June 1. According to the fine print, the Air Canada discount expires at midnight in the city of your departure, the Porter discount expires at 11:59 PM ET and the WestJet discount expires at 9:59 PM MT. They're all valid for travel between June 9 and December 15, 2011.