Glasgow to Belfast in late Nov.

Jet Glasgow to Belfast 2 1/2 hrs $67.00. Bus and Ferry 6 hrs $40.00. These are average prices as of today.

Check out www.skyscanner.net

this tells you about train/ferry links between Scotland and Northern Ireland (not sure why this is the Wales forum)

http://www.seat61.com/NorthernIreland.htm#via%20Cairnryan

Note that if you're flying, your Scottish departure points are not limited to Glasgow or Edinburgh. There are also flights to Belfast City airport from Aberdeen and Inverness. So, if you're headed to northern Scotland, you can go right to Belfast without backtracking through southern Scotland.