Porter Airlines Canada is offering children flights starting at just $22 including all taxes and fees when they travel with an adult. You will see a star beside all applicable flights.
This deal is applicable when a child flies with at least one adult. The child must be eleven years old or younger. There is a maximum of four adults and four children per booking, which I really do not see being a problem.
There might be some blackout dates as well. November 8 - 11th looks to be a potential blackout date for the deal, as well as November 27th to December 1st. This deal is only for travel until December 15th. The offer is valid for travel between Friday and Monday. It looks like these fares are non-refundable.
For more fine print see the link above. I think this is a nice way to take your child along to visit relatives or let them see a bit more of the world while still on a budget.
(Expiry: 15th December 2013)