Finding a cheap flight can at times feel as tough as scoring a decent snack on an airplane.

But travel experts generally agree on one piece of advice to getting a good deal on airfare: Be flexible.

“It’s our No .1 advice, always, for travelers” looking for deals, said James Byers, head of the product team at Google Flights.

Flexibility may mean flying midweek instead of during the weekend, or perhaps traveling outside of peak season for a particular destination, he and other experts said.

“Try not to lock yourself into a really specific date,” Byers said.