If you have a credit card that offers rewards or a frequent flier program with an airline, sign up. This can seriously cut down on your expenses. For example, if you fly United Airlines, American Express Membership Rewards allows you to earn up to 55% in bonus points when you fly. That means you could fly for as little as 1 cent per mile. As long as you fly at least 10 flights per year, you can redeem those points for flights, hotel stays, and other rewards. Keep in mind that you’ll have to pay an annual fee with this card, but if you fly enough, it’s likely worth it. If you don’t have a credit card with a frequent flier program, many airlines now offer their own online travel websites. British Airways, Southwest, Alaska, and Delta all have their own websites, so you can conveniently compare prices and pre-book your tickets.