Best deals from Toronto to Western Europe?

[Stiff]

I'm planning on going to western europe on July 19th (wednesday). I hear that the cheapest is to fly to london and return from london. Just wondering if anyone has any recommenations on cheap flights, or if London is good way to go? Cheap ways to go form London to continental europe and back? If there is a way to enter one way and leave from another country?

I'm trying to get the cheapest flights possible so i can use more money during my trip :D



Any past experiences and tips would be very very very appreciated!