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You should ideally book your international flight tickets at least six weeks to 3 months prior to the day of flying. This will ensure that you get the cheapest deals.

You can use these websites for good last-minute airfare deals - Hopper, Airfare Watchdog, Secret Flying, The Flight Deal, Expedia, Orbitz, and Last Minute Travel.

Some airlines may request you to enter your passport number when booking an international trip, but this information is not required at the time of booking. However, you must present your passport at the airport to TSA employees before you will be allowed to board an international flight.

Book your flight at least 25 days in advance, but not further out than 150 days. Flights go on sale 11 months before departure, but don't expect to catch any airline deals more than 150 days prior to takeoff.

By booking at least six weeks in advance, buying the ticket on the cheapest day, flying early in the morning, and by signing up for alerts with top airlines you can find the best deals.

Skyscanner, Kiwi, Kayak and Hipmunk are the best apps to book your international flights on. Sign up for their alerts if you want to get notified every time there is a great ticket fare deal.