Upvote:1
Am assuming your origin is fixed. In that case you can still do the 'Explore Destinations' on Google flights. Alternatively you can also go to skiplagged.com, go to the center of the home page, enter your origin and click on Search Deals. Let me know if this is what you are looking for.
Upvote:1
Flightbot (https://flightbot.com) has something kind of like this where at the very least, you can search for the cheapest prices across a range of trip lengths (e.g., 4-10 days). For example, take a look at this trip for the lowest prices from San Francisco to Hong Kong:
https://flightbot.com/search/SFO/HKGA/Economy/period/4-10-days?dateFilterType=none