Make sure you check the restrictions and cost for oversized luggage for whatever airline you are flying. If you are taking Iberia, it looks like the size limit is 158cm cubed and 32kg max weight. Supposedly the shipping weight is 70 lbs (31.75kg), so you might fit right under the cut off.
He is a link to Iberia’s checked bag requirements. http://www.iberia.com/us/luggage/allowance-in-hold/?language=en