Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Fredericton to Glasgow as you normally would.
For a flight from Fredericton to Glasgow, you will be flying from Fredericton. Fredericton (YFC) is just 13.3 km from the centre of the city. Fredericton is the only Fredericton airport and it handles 0 outbound flights to Glasgow per day. 2 airlines have flights to Glasgow from Fredericton on a regular basis.