The Train is your best bet from Belfast.Some of the other regulars may be able to give you guidence on the fare's
Whether you get the train or bus you'll need to change at Coleraine and get a bus from Coleraine to Portstewart. I think train is more comfortable but get on at Great Victoria St to get a seat as it gets very busy at key commuting times. I haven't travelled recently to remember the fare but it"s not worth prebooking. I think last time it was maybe £15 for a day return - certainly whole fare wouldn't be more than £20.
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