Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Edmonton to Jasper as you normally would.
Edmonton (YEG) is the airport you will fly out of if you book a flight from Edmonton to Jasper. You should not have trouble finding flights to Jasper from Edmonton; the airport handles an average of 0 outbound flights to Jasper per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Edmonton airport to Jasper. It is only a 26.9 km journey to Edmonton (YEG) from Edmonton’s city centre.