Planning a fall or winter vacation? If so, you’re probably looking for ways to have a great time without spending a fortune. For example, if your destination requires air travel, book in advance and purchase round-trip tickets when possible. Flying in and out of the same airport typically saves you money, too. Try to be flexible with travel dates since some days are much less expensive than others. Keep in mind that domestic airlines typically offer the best deals at six to eight weeks out.OK, that one was easy. We have 18 more — some you may not have thought about on your own. For the full list, read the story on our sister site, Living on the Cheap.