honolulu and maui are usually the cheapest hawaii airports to fly into, although recently ATA (www.ata.com) has been offering direct flights from oakland to hilo (airport code: ITO). in fact, i just saw an ata oakland -hilo flight special for $129 each way - amazingly cheap! someimtes aloha airlines and hawaiian airlines offer low interisland fares for about as little as $39 oneway, but they are rare and occasional at best. in my experience, united tends to be a lot more expensive than many other airlines, so i say screw the voucher (unless it's realy a lot) and just check out other fares on other airlines. good luck! ~jaRed. :)