Scott Dann gave the visitors the lead with an own goal and then Gabriel Obertan wrapped things up as he scored a breakaway goal just before the end.
The Newcastle win leaves Rovers deep in trouble, but it makes Newcastle strong contenders for a Champion’s League spot.
Pardew told Sky Sports after the game: “To be honest we’ve dug in all year that’s why we’ve found ourselves where we are, some tremendous defending,”
“Blackburn are in good form and they made it very, very difficult for us tonight. We had the breaks in the game which we didn’t get at Brighton and you need that sometimes and that was probably the difference tonight.