Only way to know is to visit the greyhound website and enter your travel details, departure, destination, and dates. You will get an instant estimate of the best price available at that moment. There is no fixed price for all days, but you can get a lower price if you plan and buy your ticket weeks in advance. I prefer Megabus over greyhound though, except that greyhound covers more destinations
Really? How would anyone know that? You going to Alaska? Or you going to the neighbor's house? Lol
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