It May Be Cheaper To Buy A Paper Ticket To / From Luton Or Luton Airport PKWY (If You Do So You Can Take A Child For Just £2.00 For A 1 Day Travelcard( Only On Thameslink, It Wouldnt Be Accepted On EMR)) And Then Either Pay For The Shuttle Bus Seperatley, (Mike Has Detailed The Fares Above) Or Purchase A Plusbus Ticket (Which Isnt Valid On The Shuttle Bus) But Is Accepted For Unlited Travel On The Multitude Of Buses That Connect The Airport To Parkway Station Or The Main Station In Town, So If You Decided To Make More Than One Trip On The Bus, This Would Be Do-Able