The ISO by Castle
4-796 Kuhio Hwy, Kapaʻa, HI 96746
Room Reservations: +1 (866) 290-5708
Hotel Direct: (808) 822-3971
Email: [email protected]
Get Social with Castle Resorts & Hotels
Offers
Deals & Promotions
Find the deals and the promotions meant just for you. Check out our seasonal specials, plan in advance for our best deals, or grab last minute bargains that pop up.
Enjoy up to 30% off your next Castle stay when you book by 12/4/25, for travel through 5/21/26.
The longer you stay, the more you save. Linger longer with special pricing—up to 20% off.
Plan ahead for better deals! Book in advance for up to 30% off. Don’t miss out on great savings! *
For Hawaiʻi residents only, when travelling interisland for events, appointments or family celebrations, receive 20% off + perks when presenting Hawaiʻi ID.
Active/retired military save 15%! Simply show your Military ID at check-in and enjoy!
Guests 60+ enjoy 10% off travel! confirm your Prime-Time discount at check-in.
AAA/CAA members get 10% off! Present your active membership card to enjoy this deal.
Get 10% off stays for business, meetings, or conventions. Extend for some “bleisure” time!
Gov employees & DOD contractors save 10% with ID. Book now and save!
* Limited to select room categories. Prepaid non-refundable.
Our flexible cancellation policy gives you peace of mind – cancel or change your reservation without hassle should your travel plans change, subject to the standard deposit and cancel policies. Blackout dates and minimum stay may apply. Not valid with other offers or group bookings. New reservations only. Additional restrictions may apply.
Best Rate Guarantee! Book Direct & Save!
Terms apply.