Depending on when you want to travel and how far in advance you book your tickets, travel between the Hawaiian islands can be very reasonable. Flights can be found as cheap as $39 each way on Hawaiian and Southwest Airlines. $39 is the best we've seen. Expect to pay between $50 to $100 for a one-way ticket.
Can you go to Maui for the day from Oahu?
Maui's Road to Hana Day Tour from Oahu Tour FeaturesYou'll travel to and from Oahu with an experienced and knowledgeable guide who will show you Maui's best sights and attractions. Your guide will also provide commentary about the island's history, culture, and natural beauty.