Aug 2, 2017. If you're an experienced or flexible traveler, KAYAK is also the best site to find hacker fares — round-trip options made up of one-way flights from two different airlines. The basics: All you have to do is enter your travel dates, destination, and desired cabin class. While KAYAK's search engine is much slower. STAMFORD, Conn., Jan. 17, 2018 /PRNewswire/ — KAYAK recently launched its 2018 Travel Hacker…