St. Andrews to Edinburgh

Probably the easiest and cheapest way would be to take a bus from Edinburgh to St Andrews. The St Andrews bus station is very conveniently located in town. St Andrews doesn’t have a rail station, but Leuchars is just a few miles away. If you want to take the train, you get off at Leuchars. You can then take either a taxi or bus from the Leuchars train station the rest of way into St Andrews. Both are readily available from the Leuchars rail station. There’s also the option of having a taxi transfer between Edinburgh and St Andrews. There are several companies in St Andrews that do this, but this would obviously be the most expensive alternative. You won’t need a car in St Andrews. The town is delightfully walkable and taxis are readily available if you wish to go a bit further afield. Our daughter just graduated from there so we’ve made many trips back and forth between Edinburgh and St Andrews and never had a car.

Thanks. We are actually wanting to get to London from St. Andrews. Maybe easiest way is to take train from Leuchers? Really appreciate this

You can indeed take the train from Leuchars to London. See https://www.thetrainline.com/train-times/leuchars-to-london-kings-cross

As for whether to have a rental car in St. Andrews, the town itself is walkable and (if I recall correctly) most parking is not free. If you want to see the surrounding countryside, then naturally a car is advantageous. If your interests are in the town itself, then you should be fine with public transportation.