Does WWOOF Japan or hosts pay my airfare?

No, you must organise and pay for your airfare to and from Japan, and your travel costs inside Japan yourself.
WWOOF Japan  Honcho 2-jo, 3-chome 6-7, Higashi-ku, Sapporo, 065-0042  JAPAN
E-mail: Contact Form   Fax number from within Japan: (03) 4496-6370    Fax number from outside Japan: +81 3 4496-6370

WWOOF Japan LLP (Limited Liability Partnership)