Skiplagged.com, the brainchild of Aktarer Zaman, operates by searching flight patterns where the intended destination is a layover city instead of the flight's final stop. The practice is only possible if passengers don't check a bag.
While it may seem strange that a ticket to a place closer to home may cost more than one an extra 2,000 miles away, Skiplagged reports that consumers have saved as much as 80 percent on airfare compared to other sites.
Here's the issue: The practice is prohibited by many airlines.
"This practice violates our fare rules, and we are taking action to stop it to help protect the vast majority of customers who buy legitimate tickets," Christen David, a United spokeswoman, told ABC News.
Until recently, consumers were given a "hidden city" itinerary on Skiplagged and were then directed to Orbitz to purchase the flights, according to a lawsuit filed in federal court.
According to the lawsuit, Orbitz asked Zaman, who was an affiliate partner, to stop allowing hidden city searches on his site.
"Zaman agreed to stop engaging in this prohibited form of booking, only to continue the conduct unabated," the lawsuit states. "At the same time, Zaman has taken steps to try to hide from Orbitz and United his continued bad conduct and breach of promises to stop."
Zaman did not immediately return a call seeking comment. He has until January 6, 2015 to file a response, according to court documents.
In a GoFundMe page Zaman set up to fund his legal defense, he said that "everything Skiplagged has done and continues to do is legal."