Imagine finding a great deal online with a flight ticket lower than its usual price. Add this to your itinerary and buy the tickets at the same price after a few days even after the cost of the ticket has increased and the flight is totally full! Does it sound cool? This is exactly what farelock on united means. Itineraries can be held with Fare Lock for your choice of either three or seven days. The price of your itinerary is guaranteed during the hold period, until you decide to complete your purchase and this facility is provided only by the united airlines. If you're booking on united.com, look for the FareLock logo next to fares when you choose flights. After selecting flights, you can buy FareLock, if available, in the Purchase Options section on the Review Trip Itinerary page.