Total SCAM! They advertise the tickets for a lower price, and after purchasing the tickets and giving you a reference number that is legit, they will call you saying the airline (United, in this case)is fully booked and you need to purchase a ticket on a different flight. But for double the price. I called United just to confirm if that was true, and they said to stay clear of cheapest fares website. They are total scammers, bait you into buying a cheaper ticket only to call you back like a thousand times, trying to get more money. Never again, lesson learnt!