Canadian Freebies, Coupons, Deals, Bargains, Flyers, Contests Canada. … Book by July 6th, 2014 at 11:59 PM EST and enter the promotional code 5XK1VJ to receive your discount at check out. The Porter Airlines Canada Discounts with this promotional code are as follows: 35% discount on all … July and August. Discounts on all other days will vary. This Porter Airlines Canada promotional code cannot be applied to flights between Canada and the US on Sundays.