As a transborder traveller, the costs can often be pretty high! I have noticed a few improvements and occasions when prices are cheaper from EWR-YYZ, but the new all-in pricing and the re-entry of WS back to the LGA-YYZ market means some pretty low fares (and serious competition!) Westjet will begin flying this route on June 4th and they are having a seat sale. Naturally, Air Canada will match and the flights can be had for as low as $194. WS' sale ends on Feb 15th, so I suspect AC's will also conclude at this time. Sale fares are from June 4th to Aug 29th.