Hi! Am 2015-06-01 14:18, schrieb Wookey:
bahn.de is your friend. It looks like a practical option (assuming airport-> central station is not difficult) The 14:26 gets you direct to Heidelberg main station in 4:48. For €19.
Please be aware, that the 19€ Tickets ("Sparpreis") are only valid for the booked connection. Should your flight be delayed and you miss your train you can not transfer these tickets to a different connection.
Best regards, Alexander