- Most widely used travel information search platform. Compare the cheapest flights of every airlines. Best flight tickets using month view is cool (if flexible).Skyscanner is great. No fees, great UI, great for flexible travel.
- Reveal hidden prices. They claim this - "We're better at finding cheap flights than anyone else— so good, United Airlines actually sued us for it". Skiplagged 2 [New version] They show hidden city ticketing trips in addition to what sites like Expedia, KAYAK, and Travelocity show. Taking a stop might save hundreds of dollar as @melaniepinola mentioned here - http://lifehacker.com/skiplagged... You can also track previous searches for changes in price. Available on iOS/Android.
- I prefer Obritz over Skyscanner because it offers a lot of alternative flights and cheaper. Traveling from South America to Asia is not easy due to visa requirements (mostly go through US) but with Orbitz, it give me visa-free routes and a lot more cheaper.