Great question — answering as the UphillTech team:
Here is one possible solution: Go to airwander.com Click on the "Roundtrip" drop-down menu, and change it to "One Way" In the origin and destination airport boxes type "Addis Ababa - ADD" and "Paris - CDG" (One limitation seems to be that you do need to select a specific airport rather than just "Paris") Enter the departure date (5/8/20) Click the red "+" button and let the website do it's thing for a few seconds. The result is a list of stopover destinations sorted by the amount of money they would add to the non-stopover price (from low to high). To change your desired stopover length, use the -/+ buttons near the upper right-hand corner of the page. If you want to look into specific...
Full answer by Bunji: https://travel.stackexchange.com/a/153812 (CC BY-SA 4.0).
Need it done for your business? UphillTech.