By far the simplest (but not cheapest) way to get from Dulles to Charlottesville is to fly. United Express operates several IAD-CHO nonstops, each under an hour on a regional jet. This flight, however, would cost a few hundred dollars when booked separately and on short notice.
edit It seems from the comments that you are flying into Atlanta and ...
It's hard to pinpoint the exact reason without more details. Here are some possible reasons.
Broken onboard tracker
If Greyhound doesn't have data from the tracker, for instance because it is broken, they will list the bus with this note:
We're sorry, but the expected times of arrival of this bus are currently unavailable. Scheduled times are below.
The train is more comfortable, and in both cases you will have to get into Washington DC from the airport. They appear to be about the same time in transit.
However, there are only two or three trains per day. On Dec 11, there are departures at 4:50 pm (you are not likely to make this) and 6:30 pm. You will make the latter train if your flight is on time.
I work for Busbud, a bus booking app based in Montreal. We currently (August 2018) don't support Greyhound Canada's ISIC discount (hopefully we can soon). We do have some tools that may help you compare and find other bus companies where available, and search across various stops within each city.
It's odd that you aren't able to book two ISIC tickets on ...
Unfortunately, there are few resources for tracking on-time performance of Greyhound buses. To get a sense of performance on the route, you can use the Greyhound BusTracker website supplied by Greyhound itself. This is a "current status" tool, like an airline flight tracker, and you cannot find historical information with it; but if you check it on a daily ...
To find data about Amtrak's on-time performance, there is the indispensable Amtrak Status Maps Archive Database (ASMAD). This site gathers data from Amtrak's website and presents it in an easy-to-sort format.
For the Empire Builder (train #8), this site shows that the train arrived late by 45 minutes or more on six days out of the last thirty. So there's ...
It will not. If you can have it by your feet or on your lap or above your head (within reason), you can take it on board.
Source, have taken many, many Greyhound trips, including where I'd take a largeish bag and just put it by my feet for convenience. It was not small, but I was happy to rest my feet on it.
If it's a suitcase, they may ask to check in (which goes in the check in bin in the belly of the bus). If it's a back pack or something similar, you can carry it with you. As far as the ticket goes, you can print it from your home, print it out from a kiosk at the bus stand or use your smartphone to scan the e ticket and avoid any printing altogether.
Greyhound is generally flexible, and allows for exchanges.
What you can change
You can swap your ticket for a new date and time, but you won't be able to change where you're traveling from or to. Before you contact us, check the rules on ticket exchanges:
How to exchange tickets
You can exchange your ticket at any Greyhound station, before ...