High season in the Whitsundays coincides with school vacations, which occur in January, in mid-April, from late June to early July, from late September to early October, and in late December. The Aussie winter, June through August, is popular, too. You have to book months ahead to get high-season accommodations, but any other time you can indeed find some good deals: Specials on accommodations, sailing trips, day cruises, and diving excursions fairly leap off the blackboards outside the tour-booking agents in Airlie Beach.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.