CheapAir.com recently released its annual study on when you should book your flight to get the best deals, analyzing about 1.2 million trips from the US to 74 popular destinations.
Here's what it found out about booking international flights.
The data shows that certain international destinations can be cheaper to fly to if you plan far in advance, though this isn't necessarily true across the board.
There are also other variables you should keep in mind. These include the number of people in your party, whether you're traveling during the high tourist season, and any extenuating circumstances — like major events or political tensions — that might affect the demand and price.
Earlier this year, CheapAir also analyzed about 1.3 billion flights in the US to determine the best time to book a domestic trip, which it found was 54 days in advance.
For domestic flights, CheapAir broke down the booking process into five stages.
For domestic flights, the typical pattern is that flights first open for sale with fares on the higher side.
The period when you're most likely to score savings is during the "Prime Booking Window" of 21 to 112 days before your trip. According to CheapAir, the timing of this period has been pretty consistent every year.
It's also important to keep in mind that airfare predictions can often contradict themselves, and fares are tricky to predict. You can also sign up for price alerts on sites like Airfarewatchdog.com.