There is no definitive answer to this question as the best time to sail to Alaska depends on a number of factors, including what you hope to see and do while you're there. However, in general, the best time to sail to Alaska is during the summer months of June, July and August. These months offer the longest days and the warmest temperatures, making them ideal for exploring the state's stunning natural scenery. They are also the busiest months for tourism, so if you're looking to avoid the crowds, you may want to plan your trip for a different time of year.