Here’s an airfare tip. Do you ever try to see if the price would be cheaper to book two one way tickets? Have you ever priced a multicity airfare?
I do I used to buy only round trip tickets. I realized that two one way tickets are sometimes less expensive than a roundtrip ticket. So before you book your roundtrip make sure you give it a try. Best part about this technique for one way is that you may want to travel a different airline for your departure or return because of flight times, connections etc.
For multi city you can see more than one city. Remember some countries may require you to show both legs upon arrival if you have a one way ticket.
My favorite airfare search engine is currently Google Flights it provides you with so much analytics you can also narrow down your search to be really specific. You can also set up airfare alerts.