Cheapest flight from newcastle to tenerife south?

I am trying to book a flight from newcastle to tenerife south, flying on the 25th may and returning on the 1st june (flight only)
it is for 2 adults and 2 kids, but the quotes i am getting are extortionate, does any1 know of any airlines that offer really cheap direct flights? i am looking at under £600 if poss.
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