Here's the international break down if you're departing from the US.
To Europe: 176 days before departure, savings of 11%
To Caribbean: 77 days before departure, savings of 5%
To Asia-Pacific: 160 days before departure, savings of 13%
To the Middle East and Africa: 144 days before departure, savings of 24%
To South America: 90 days before departure, 10%
But, of course, a good deal is a good deal, and airline sales can hit on any day of the week. So, if you see a good price even on, say, a Thursday, book it. After all, Thursdays need love too.
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Kara King is a News Writer at Thrillist and is going on a mental vacation soon. Send news tips to email@example.com and follow her at @karatillie.