According to new data, you might find a better deal on a different day.

By Perri Ormont Blumberg

Picturing lounging on a beach in Sanibel Island amidst the rolling shores and twinkle of seashells? Are you ready to jet off for a long weekend of R&R on Lake Charles with more crawfish than your cooler can carry? If you're anything like us, perhaps you've adhered to the fable: "Buy airfare on Tuesday to score the cheapest deal!"

But who said that? Where did that come from? We don't know and as it turns out this may be more of an Internet era wives' tale than anything else.

According to a recent interview in Bloomberg with Patrick Surry, Chief Data Scientist at Hopper, a fare-predicting app, this no longer holds true. "People want there to be this kind of golden rule you can use to know when to book your airfare," said Surry in the interview, making our bargain-hunting heartstrings pang. "But it's hard to have a rule of thumb when the system is adapting in real time."

He added that in the past, humans used to intervene more and create flash sales, typically on Tuesday and Wednesday but now those decisions are left to computer algorithms.

Surry has a few big takeaways for travelers eager to snag a deal. While he emphasizes that you shouldn't count on seeing many dramatic price drops on popular domestic air travel routes in America, you may have better luck with international travel. In fact, according to Hopper data, the best day to book an international flight is on Thursdays, where you can save, on average, $20 a ticket. For domestic flights as well, Thursday's offered up the greatest in potential ticket price drops, with all 7,500 routes in America showing a discount of around $12 a flight.

If you can't find an airline deal that meets your needs, keep your eyes peeled for plenty of hotel flash sales this summer.