Great question — answering as the UphillTech team:
Skypicker can do the "anywhere" part, although not the hours: When you select a departure airport, select To: Anywhere, and departure and return dates, the map on the right will then show the lowest prices to nearby destinations, and the left column will show destinations sorted by price, with the lowest priced destinations listed first. If you selected One way, you will see one way prices, and if you selected Return you will see return (round trip) prices. On the map, you can right click a city to select it as your origin, and left click a city to select it as your destination. One quirk of this web site is that the form doesn't actually have a submit button. It tries to search as soon as...
Full answer by user4188: https://travel.stackexchange.com/a/43694 (CC BY-SA 3.0).
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