Alicante Aiport is best airport to use, it is about an hours drive to Abdet. There are cheap flights from most European airports (Ryanair, Easyjet, etc). Valencia is also possible. If flights are looking expensive and you have the time you can try flights to Madrid. It's an interesting journey to make !
You really need a hire car as bus transport beyond Benidorm is very limited. If you are part of a guided holiday we will arrange transfers from Alicante Airport for you. We may ask you to catch the express bus which runs every hour from the airport to Benidorm.
CAR HIRE - we suggest you have a car, they are very cheap to hire, ususally £5 a day or less, although most will charge you for a full tank of petrol as well - we recommend www.rhinocarhire.com