We (3 adults) are arriving at Gatwick Airport (from the US) at 1200 noon and are planning to go straight to York for our trip in May. I was planning on buying the Thameslink train from Gatwick to London St Pancras when I get there since it comes frequently and I don't want to commit to a specific time, just in case I miss that train, or does it matter? Am I able to buy a Thameslink train ticket for use anytime during that day?
I'm looking at ticket prices from London Kings Cross to York and the prices very greatly, some are 37 pounds/person, and another train (same train company) leaving just half an hour later is 95 pounds/person. It's really tempting to take a risk and buy the 37 pound ticket. Is there a way to find out how much the ticket price is for a particular train if I purchase it when I arrive?
Thank you in advance for your responses.