Applies to bookings for 4+ travelers. Airfarewatchdog scours the airlines for deals and notifies you with details. This company follows deals regarding your flights and emails you when exceptional prices become available. This magic formula for nabbing a great airfare has been so widely believed for so long that it even earned its own moniker: Travel Tuesday.

Most passengers benefit from opting for the cheapest and shortest flights. So as you earn three points per dollar (or six points per dollar, if you book directly on JetBlue’s site), you know that they’re piling up, big time, into a treasure trove of free flights.

We make it quick and easy for even the busiest travelers to navigate the Asia flight booking process, saving you time and money on everything from top routes, cities to explore, and important airport information. In determining which of these sites are the best ones for you to compare prices with, it’s helpful to determine which sites meet your trip-booking needs.

If you’re buying airfare for your family of four, for example, it does not matter if the airline has three seats for sale in a lower price category and the fourth at a higher one. Another plus: Momondo searches for fares from a ton of smaller OTAs, which could lead to a deal that other metasearch tools miss.

U.S. booking sites also tend to not have the obscure foreign airlines that you see on international sites like Skyscanner or Momondo. Sometimes the cheapest flights to Ireland can be found on discount airfare websites like Expedia or Travelocity. First of all, search online to find the cheapest plane tickets.