What websites can you find cheap flights without having to enter a destination?

I'm looking into going on holiday in May & thinking about booking flights & hotel separately. Trying to find a website that I can enter a rough date but not a destination so it can tell me flight prices and I can choose the cheapest out of my destination shortlist-do you know of such a website? NB I will be... show more I'm looking into going on holiday in May & thinking about booking flights & hotel separately.
Trying to find a website that I can enter a rough date but not a destination so it can tell me flight prices and I can choose the cheapest out of my destination shortlist-do you know of such a website?
NB I will be flying from Glasgow and thinking Majorca, costa del sol, fuertaventura, Tenerife or algae as destinations in may
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