Welcome to the forum tw67.
Only question I would have is what time is your morning flight from Edinburgh?
The main M8 motorway would be the route for both bus or taxi, but it is only a two lane motorway once out of Glasgow and in the morning rush-hour (from 7am on to 9.30am approx. the tailbacks can start at Junction 4 (Bathgate), so that would have to be factored into your planning, unless a weekend flight.
Our Flight is at 9:30 am, so we would try for the first bus. Even if we get the second bus, we would still be ok, but I like to always be early!
Where are you flying to? I think the 0615 one would get you there in plenty of time.
First CitylinkAIR leaves Buchanan Bus Station at just after 4am.Edited: 22 January 2018, 23:29
It was a major price difference at booking, and we already knew that there was transportation to get us from Glasgow to Edinburgh, but we weren't sure the easiest way. But we already knew that it wasn't overly expensive. Great to know that 2 hours before the flight is all we need, so it will be one less thing to worry about. Thank you for all the help.