Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Glasgow to Jackson as you normally would.
For a flight from Glasgow to Jackson, you will be flying into Jackson Hole. Jackson Hole (JAC) is just 8.8 mi from the center of the city. Jackson Hole is the only Jackson airport and it handles 0 inbound flights from Glasgow per day. 2 airlines have flights to Jackson Hole from Glasgow on a regular basis.