The airline industry desperately wants to squeeze as many Benjamins out of us flyers as they can, but you don’t have to fall prey to their price hiking tactics. With the right app, you can save hundreds of dollars on an upcoming trip, with virtually zero effort on your end.While Tuesday afternoons are still often the cheapest time for fares , you don’t need to watch the clock to know when to start searching on the United website. Now, smart travel apps do all that thinking and management for you. Just plug in your destination, date range, and budget, and let them take it from there.Click through for six awesome apps and services that will take the stress out of finding a cheap flight so you can focus on what really matters: having fun once you arrive at your destination.This article first ran June 22, 2015.