1. Booking airline tickets too late
This proverb fit here- The early bird really does catch the worm! You can also compare and it is real that airfare are high before. As united flight booking starts seats availability goes down then fares will automatically be high. In this case you have no more options to book at low fare if discounts not available on you planned travel date. So it will be very clever idea to plan your trip first and try to book immediate by comparing fare from all available options.
2. Not being flexible with dates and destinations
While confirming your flight try to search or ask over phone to compare fare with some other nearby places and make a note. You can collect some fare with different dates if possible. This fare chart helps to select the cheapest options with specific airlines and dates.
3. An impulsive buyer
It's a very big mistake to immediate confirm for United flight tickets without looking for all your options first. Hold off the "buy or call" button until be sure that there are no more offers from other airlines to alternate destinations or airports. Some aviation companies allow you to cancel your booking within 24 hours of purchase for free. Just try to hold on your booked flight and search regular for 24 hours. Call some other travel agencies of United States like flightfaredeals and ask for best deal and compare the total cost. If you find some cheapest fare from earlier then try to cancel first booking and book last one as soon as possible. By doing this you can save some big amount.
4. Not checking fare with alternate airports
It is very good idea to spend some time on search engines to compare fares for other airports or other airlines like united, delta, Lufthansa , American ,Air Canada and many other small air carriers. When you search for long route or larger destinations, there will be more than one airport available as an offer. For example, New York boasts Newark Nj, New York Kennedy(JFK), London has Gatwick, Stansted and Heathrow and Washington DC is served by Ronald Reagan National Airport, Dulles International and Baltimore-Washington International. So before confirming your flight, check all available arrival airports and include the cost of transfers into town in your final trip calculation.
5. Checking fare in one airline only
In the days of Lufthansa airline flights aggregating search engine, website and travel apps, passengers no longer limit themselves to the fare of just one air carrier. Search engine like Google, Bing, Yahoo and many other travel agencies like flightfaredeals, Jussfly, Cheapoairtoday is the better options for everyone, who want to search online flight fare and book it. These options make it possible to get average current seat fares from every airline on a fixed route. Be careful to compare prices and select flight for your destinations. Always compare total fare before you make a call for reservations.