Great info! Don't forget about airlines that offer "Stop Overs" so that you can travel to multiple destinations for the airfare cost of one!
All of these airlines offer that option: WOW, Finnair, Hawaiin Airlines, TAP Portugal, Icelandair, KLM, Air Canada, Etihad Airways, Japan Airlines, Thai Airways, Turkish Airlines and Copa Airlines.
RE: How to find the cheapest flights from anywhere!