This is the best time to book a flight to 10 destinations around the world

Determining the change in cost for 10 luxury cities

While many of us might think booking a flight early is the best bet to lower costs, sometimes the opposite can be true.

To help make it easier, KAYAK analyzed flight searches from the US and Canada between November 1, 2014 and October 31, 2015, determining the change in cost for 10 luxury cities when booking from a period of one month to six months before departure.

The data is part of KAYAK's 2016 Travel Hacker Guide, in conjunction with the 10 Luxury for Less Destinations list within the guide. Keep scrolling to see when it's best to book early and when you can get away with that last-minute trip.

Medellín, Colombia — Median airfare by days before departure ranged from $529 to $653.

Best time to book: Four months before departure
Worst time to book: Five months before departure

Kuala Lumpur, Malaysia — Median airfare by days before departure ranged from $1,044 to $1,200.

Best time to book: Two months before departure
Worst time to book: Four months before departure

Ho Chi Minh City, Vietnam — Median airfare by days before departure ranged from $798 to $1,059.

Best time to book: Six months before departure
Worst time to book: Three months before departure

New Delhi, India — Median airfare by days before departure ranged from $1,007 to $1,079.

Best time to book: Two months before departure
Worst time to book: Five months before departure

Bangkok, Thailand — Median airfare by days before departure ranged from $915 to $1,072.

Best time to book: Four months before departure
Worst time to book: Six months before departure

Istanbul, Turkey — Median airfare by days before departure ranged from $881 to $974.

Best time to book: Five months before departure
Worst time to book: Six months before departure

Phuket (Phuket City), Thailand — Median airfare by days before departure ranged from $1,136 to $1,271.

Best time to book: Six months before departure
Worst time to book: One month before departure

Beijing, China — Median airfare by days before departure ranged from $1,011 to $1,160.

Best time to book: Three months before departure
Worst time to book: Six months before departure

Panama City, Panama — Median airfare by days before departure ranged from $497 to $677.

Best time to book: Two months before departure
Worst time to book: Five months before departure

Athens, Greece — Median airfare by days before departure ranged from $1,080 to $1,199.