My first option for that would be the train. If it's because the trains are knackered (think they might be this weekend on some routes) then it's about half an hour and probably (although I may be out of date) about thirty quid.
Pretty sure Preston has Uber so you can have a check on there.
Anyone ever taken a taxi from Preston to Blackpool? If so, how long did it take and how much did you have to pay?