Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Whistler to Cuba as you normally would.
Related info for your journey
Useful info, stats and facts about Whistler to Cuba flights.
This is defined as Vancouver Intl Airport (YVR) and Havana Jose Marti Intl Airport (HAV). Codes like Havana Jose Marti Intl Airport are often used to just call airports uniquely. Las Tunas Airport (VTU), Holguín Frank Pais Airport (HOG), Baracoa Airport (BCA), Cienfuegos Airport (CFG), Santa Clara Airport (SNU) are other airports near this flight route and their unique identifiers/IATA codes.