Best and worst days for travel in 2015 busiest day Best and worst days for travel in 2015 busiest travel day Conde Nast Traveler busiest travel time Best and worst days for travel in 2015 Best and worst days for travel in 2015 Conde Nast Traveler busiest travel day Best and worst days for travel in 2015 least busiest busiest travel day December 23rd busiest travel day December 23rd Best and worst days for travel in 2015 Best and worst days for travel in 2015 December 23rd avoiding November 25th and December 23rd