United Airlines on Wednesday clarified that it will not honor thousands of cheap flights booked by passengers due to an error in the airline's computer that showed trips such as a $70 first-class fare from London to Newark, New Jersey.

"United is voiding the bookings of several thousand individuals who were attempting to take advantage of an error a third-party software provider made when it applied an incorrect currency exchange rate," Rahsaan Johnson, a spokesman, said in an e-mail. United filed its fares properly, he said.

The talk over the glitch started on Wednesday with several travel bloggers and chat room members of the Flyertalk website raising this issue. By following certain steps, including changing the passenger's host country to Denmark, it was possible to book international flights at exceptionally low fares. At travel blog Dansdeals, a fare of 502 Danish kroner, or $76.28, was cited for flight between London's Heathrow Airport and Tel Aviv's Ben Gurion Airport on October 13.

A series of steps were detailed by the website which were required to book the tickets, including leaving the billing country as Denmark and using a credit card without a transaction fee.

According to United, majority of the problematic bookings were for travel originating in the U.K. and the level of bookings made with Danish kroner as the local currency was significantly higher than normal.

It may be recalled that Chicago-based United had faced this problem in 2014 too. Rival Delta Air Lines Inc also found itself in a similar situation in 2013.