Shutterstock/Leonard Zhukovsky Knowing the right time to book a trip can save you quite a bit of money. TripAdvisor Vacation Rentals determined the best time to visit some of the most expensive places in the world by looking at the average weekly rate of a two-bedroom rental at different times of the year. In some cases, the difference between traveling during peak season and the more affordable period was as much as $8,000. Whether you're looking to travel to England, Greece, the Cayman Islands, or Dubai, here's the best time to plan your trip. SAINT-BARTHÉLEMY (ST. BARTS/ST. BARTHS) Shutterstock/Leonard Zhukovsky MOST AFFORDABLE TIME TO TRAVEL: November. The average weekly rate for two-bedroom properties during this time is around $4,312. PEAK TIME TO TRAVEL: Mid- to late December. The average weekly rate for two-bedroom properties during the peak season is around $12,900. VIBE: St. Barts is home to 14 stunning beaches, most of which remain crowd-free even during the peak season. A popular destination for celebrities, St. Barts has a variety of designer boutiques, an array of fine dining restaurants, yacht and jet ski rentals, and a breathtaking scenery of mountains, green hills, and glistening bays. Click here to check out rentals » KAPOLEI, HAWAII Flickr/Joel Solomon MOST AFFORDABLE TIME TO TRAVEL: Most of November. The average weekly rate for two-bedroom properties during this time is around $2,626. PEAK TIME TO TRAVEL: End of December. The average weekly rate for two-bedroom properties during this time is around $3,850. VIBE: Kapolei, known as Oahu's "second city" after Honolulu, is built on former sugarcane and pineapple plantations. It has a sunny climate, lush green golf courses (including the Kapolei Golf Course and Ko Olina Golf Club), diverse dining options, and lots of water activities. Click here to check out rentals » ST. MARTIN Shutterstock/Sean Pavone MOST AFFORDABLE TIME TO TRAVEL: Early August. The average weekly rate for two-bedroom properties during this time is around $2,272. PEAK TIME TO TRAVEL: Most of December. The average weekly rate for two-bedroom properties during the peak season is around $5,600. VIBE: The island of St. Martin is split into two sides: the Dutch half of Sint Maarten, which is filled with bustling nightlife, shopping centers, sprawling resorts, and gleaming beaches; and the French half of St. Martin, which has a quieter ambience, with white-sand beaches, small town squares, and charming mountainside scenery. The island has 37 beaches in total and offers visitors a wide range of water activities, including everything from scuba diving and snorkeling to yachting and windsurfing. Click here to check out rentals » SEE THE REST OF THE STORY AT BUSINESS INSIDER