Yes. I believe same schedule seven days a week
Yes, buses go from Portland to Bangor on Sunday. Last bus to leave is at 8:15p. There's also a 12:05p, 4:15p, and 6:15p.
Buses DO run daily, but have noticed that lately it can be a pretty full bus. My suggestion would be to make sure that you allow yourself time and get there early. Also, they offer a movie to watch during your ride, but you have to bring headphones in order to hear it. There is a standard AC plug at each seat and free internet which actually works very well. Safe Travels
Yes 7 days a week. But takes 2 days to go down and back
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