Quick question... I'm a Canadian citizen living in the U.S. with permanent resident status. I live in the SFO area, and need a flight to get to YYZ around Christmas time. As you can imagine, flights are easily $1000+ right now. If I did the SFO to JFK on Virgin America, that would be about $200, and then do Porter to go for EWR to YYZ for about $300. Granted, I would need to get from JFK to EWR, but there are shuttles. It would be a little awkward, but is this doable? My question would mainly be the customs angle; would they be freaked that I didn't take a direct flight? I'm sure there are multi city trips that do this type of thing. Is this a crazy idea, or doable? Just trying to save a little bit of money, but if it's a silly idea to do around the holidays, I can be talked out of it.

Thanks!