2. Book your flights 47 days out.
According to CheapAir, that's when domestic tickets are at their cheapest. And since this research is based on numbers crunched from five million flights, we believe 'em.
3. Clear your browser's cookies.
Apparently, refreshing your browser to see if your flight price drops doesn't work — it might actually make the price go up! Min-Jee Hwang of Wiser, a firm that analyzes pricing strategies, told Thrillist that airline websites use browser cookies to track your search habits. To avoid this, clear your search history and your cookies before booking, or go incognito.