For instance, if you want to go on a trip from New York City to Singapore, a ticket might cost $2,500. But you may find that to fly from New York to Hong Kong is $1,600 and then from Hong Kong to Singapore, on another flight, is only $400, Coggins says.
But don't get too cute, because of the next point.
Look out for taxes, especially when traveling internationally. That's a suggestion from Caroline O'Connell, who owns a public relations firm in North Hollywood, Calif., and is the author of "Every Woman's Guide to Romance in Paris," which, among other things, offers travel advice. If you fly internationally, O'Connell says it's important to consider the taxes before take-off.
O'Connell will be flying to Paris in the near future and says she was choosy in the airline she picked. "If I'd flown on British Air or Air France, the taxes would have been $400. On IcelandAir, they were $100," O'Connell says.
[See: 10 Ways to Avoid Airline Fees.]
It's not just airlines that charge taxes, however; airports do, too. According to a World Economic Reform report released earlier this year, the country of Chad is the worst place to go if you don't want to spend a lot on ticket taxes and airport fees. England comes in second, where taxes sometimes can be as high as 184 pounds ($291, as of this writing). Even just flying into the London airport for a stopover can get pricey. Some travel guides actually suggest, if you're traveling to England, that you fly into Ireland instead – and then ferry over to England. So before you cash in frequent flyer miles or click the "pay now" button, take a look at the taxes.
And, of course, don't forget all the obvious strategies for lowering your travel costs, all of which may or may not help your bottom line: traveling in the middle of the week, finding odd hours to depart, bringing snacks instead of buying them at the airport, looking for low-cost parking, bundling airline, hotel and car rental costs with travel sites, using a travel agent and, of course, booking far ahead of your destination date.
Corrected on 09/19/2013: A previous version of this story misstated the mode of travel between Ireland and England.