Google flights can do this, you can select airports, places, countries, continents or just “Everywhere”, you can also select interests (eg, Outdoor, food, etc)
You can set a price range, and then see on the map where you can go. I spent a day in Copenhagen for about £20-30 thanks to this.
(and it also used to have a really nice bar chart for each destination showing the price over a time period for route, but they seem to have got rid of this feature)
I am a fan of Adioso, it allows you do all of what you’ve asked for, the only catch is you have to specify at least a city in the departure field, but any other field is capable of accepting broad values.
You can specify a time, or chose “any time”. For the destination, you can specify a city, a country, etc. You can then sort the results according to the price, it has that option.
WhichAirline has a similar functionality to whichbudget as far as I can see. You can enter countries but it might give you an error that this search is too broad, in that case it might help to search to “Anywhere” and then sort the results by country.
Also Kiwi.com (formerly Skypicker) might be useful. You can do countries or draw circles on a map for departure/destination area which could turn out even more handy. For a few more details see another answer of mine here. @Underyx gets credit for this handy example.
You might also want to look to Rome2Rio and focus on the flight answers.
Skyscanner allows what you’re looking for. Just type the country of origin and destination. It even allows you to set the destination as all the world instead of country.
In Skyscanner you will also be allowed to make broad searches regarding time. You can specify the time windows of your flight as specific days, but also as a month (eg.: departing in July). The results will be presented in form of a price calendar (or graph) and you can check the cheapest days.
Note:
Momondo also allows this now.
Credit:stackoverflow.com‘
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