I'm looking to get from Toronto to Boston in less than 12 hours. Is the cheapest way to get from Toronto to Boston in that case to fly? What other options are there that take under 12 hours of travel while being cheaper than flying? E.g. bus, train, renting a car, etc.
I explicitly exclude any form of travel that is self-propelled, requires riding livestock in any form, or that violates any law of physics or thermodynamics. Magic is fine.