You need to shop around to get the best deal by trying different booking discount airline tickets sites, altering your dates and waiting until just the right time to purchase. But if you’re willing to put in a little time and effort, you could save big on your next flight. Airline ticket prices typically go up in the last two weeks before flying, and if you’re traveling internationally, you will want to book even earlier from three to six months in advance for the best deals. When a New York City man developed a website, Skiplagged.com, last year, which helped travellers find cheaper flights through this style of ticketing, both United Airlines…