SEATTLE — While summer travel gets lots of love in Washington, the holiday season also brings many time off work and school, making the end of the year a prime time to travel — beyond the usual rounds for family, friends, turkey and presents. You can roam far and wide from the state with nonstop flights to exotic warm-weather locales like Tahiti and Belize; ski towns like Steamboat Springs, Colorado, and Bozeman, Montana; and historic international cities like Istanbul and Tokyo. But if you haven’t already booked a flight, don’t despair. While it may be a bit late to grab deals for this very b…