It's time to get up and out.

With summer vacation on the horizon, travelers have begun that most time-honored of internet traditions: obsessively searching airfare sites for good ideas.

You see, when it comes to travel the internet has been both a blessing and a curse. There's no question that online travel agencies (or OTAs) reduce prices for consumers. In fact, one study found that when airlines decided to limit OTA listings, fares went up by more than 10%.

On the other hand, scouring for online deals can become an endless quest. There's always one more site to check, always one more combination of dates, times, layovers and airports, always the chance that maybe tomorrow will bring a red-hot deal. It's Sisyphean, only with less eternal damnation and more complimentary margaritas.

As frustrating as it can be, though, that flexibility is generally the best way to find great prices online. For example, travelers willing to plan around the deals can try these 10 summer routes pulled by CheapAir.com. They just might get you to Europe for less… maybe even a lot less.

Editors' pick: Originally published April 26.