I love to travel all over the world when I have free time and have saved up some money.
When I plan the trips I always use online search engines to find the cheapest and most convenient airfares. I do the same thing if I am planing on staying at hotels at my travel destinations.

A search engine that make it easy to find cheap tickets is cFares. They are not a travel agency themselves, but they make it easy to search a wide variety of different online travel agencies, airlines and wholesalers to find the cheapest tickets. cFares has a simple form where you can fill in your travel information, both for air flights and hotels, and then the website will show you the various travel options.

To use cFares you simply have to become a member. You can choose two different types of membership. Gold membership is completely free and you get access to fares that are publicly available. If you choose Platinum membership you get access to fares from wholesalers and other types of tickets that is not publicly available. The types of fares you get access to with Platinum membership are often cheaper than regular tickets.
Platinum membership costs 50 USD per year and you can try it for 30 days risk free. If you are not satisfied with the membership cFares will refund the fee.