Fifty-four days before takeoff is, on average, when domestic airline tickets are at their absolute lowest price. 
Foreign countries are incredibly popular destinations with hard-to-reach airports, so the researchers suggest booking much earlier than the 54 days recommended for domestic flights.
Here are the magic numbers for some common international destinations:
Europe: 151 days before your flight
Asia: 129 days before your flight
The Caribbean: 101 days before your flight
Mexico: 89 days before your flight
Latin America: 80 days before your flight
https://www.huffingtonpost.com/2014/...n_4875266.html

Foreign countries are incredibly popular destinations with hard-to-reach airports, so the researchers suggest booking much earlier than the 54 days recommended for domestic flights.
Here are the magic numbers for some common international destinations:
Europe: 151 days before your flight
Asia: 129 days before your flight
The Caribbean: 101 days before your flight
Mexico: 89 days before your flight
Latin America: 80 days before your flight
https://www.huffingtonpost.com/2014/...n_4875266.html
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