An easy way to check prices on all flights before booking is to enter proposed flight details on a flight comparison site such as Kayak.com or Orbitz.com, and view a list of available flights with a number of airlines. Kayak also offers direct links to other flight comparison sites such as Expedia.com and Travelocity.com.
To check flight prices on Kayak, enter travel dates and airports in the flight search box on the home page. To widen the search, check the option to include flights from nearby airports, and click Show Flexible Dates to view flights three days either side of the proposed flight date. At this stage a user can also opt to view and compare Kayak's search results with those offered by other comparison sites. Click Search to view available flights. The search results for selected comparison sites appear on screens in separate windows alongside Kayak's results.
If the search includes flexible travel dates, Kayak displays a color-coded table comparing the costs of flights across the selected week. Click a price in the table to view flight information. The site also lists all available flights in price order. To narrow the search, apply a range of filters from the menu on the left side of the screen, such as the number of stops, takeoff and landing times and airlines.
Orbitz offers a similar flight search tool on its home page. The site also lists results in ticket price order and offers a range of filters to help narrow the search.