Looking for a cheap flight? Cyber Monday is the time to score some deals.

According to the airfare search engine Hopper.com, the airlines will launch major airfare sales starting on the morning of Cyber Monday, if not sooner.

“We’re anticipating a record amount of airfare deals starting Cyber Monday and continuing through the week before the holiday, based on the fact that this fall (and September in particular) was the busiest time we’ve ever seen for domestic flash sales,” the site announced. “We’re predicting that this Cyber Monday will kick off a record month for fare sales.”

Deals usually begin launching at 9:00 a.m. ET and continue into the evening for trips several months in advance.

Denver, Chicago and Atlanta as the best origins to find a sale, according to Hopper. Almost 80 percent of the flash sales are posted by major carriers like United Airlines or Delta, with low cost carriers accounting for about 20 percent.

Looking for a deal to a warm-weather location? Las Vegas, Atlanta, and Orlando are in the top five destinations with frequent airline sales. International destinations with the most number of deals are San Jose, Costa Rica, San Salvador, El Salvador, and Cancun, Mexico.

If you are interested in a specific route, use a tool like Kayak or the Hopper app to set an alert. When the price drops, they will automatically notify you. 

To find sales quickly, sign up for newsletters from airlines that service your airport — for example, Denver-based Frontier sends email alerts when they offer sales.

But make sure you check to see what fees apply--which could very well cancel out any supposed bargain.

Airlines typically don't post specific deals ahead of time, but Alaska has already announced it will host a sale on its sites. Southwest is one to keep an eye on as is JetBlue, Virgin American, Hawaiian Airlines, Delta and Lufthansa.