Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Albury to Barcelona as you normally would.
For a flight from Albury to Barcelona, you will be flying from Albury. Albury (ABX) is just 3.5 km from the centre of the city. Albury is the only Albury airport and it handles 0 outbound flights to Barcelona per day. 0 airlines have flights to Barcelona from Albury on a regular basis.