Skyservice ran a charter last year. Three flights a week from YYZ. Don't know about their plans this year. Word is that they're feeling the pinch at the moment, so I wouldn't be surprised if they cut capacity.
Air Transat and Sunwing didn't come here in the summer.
can't help canada, but FWIW, i went to the jetblue website yesterday looking for a july date and they weren't cheap, i can go to aruba for half the DR price, a whole lot further away. the politicians in SD need to cut down the airport taxes or they are going to kill the golden goose..............
We are really interested in this quesion as well. The current rates for heading down to the D.R. from Western Canada are putting serious doubts about getting down there this summer. So far, driving all the way down to Seattle and then flying from there looks the most promising.
Try these travel sites for some pretty good deals. Last minute is your best option....if you have the ability to do so. For the summer months your only option is to fly out of Toronto, and possibly Montreal.