Cardiff City suffered relegation from the English top flight.
A Shola Ameobi goal in the first half and late strikes from Loic Remy and Steven Taylor saw Ole Gunnar Solskjaer’s side go down to the Championship after just one season in the English top flight.
The win, which was pretty comfortable, will also ease some pressure on Newcastle manager Alan Pardew, who had overseen six successive league defeats prior to Saturday’s encounter at St James’ Park.
Hosts Newcastle had the first chance of the game in the very first minute when Remy found himself with the ball unmarked at the back post, but his shot was blocked by Fabio da Silva.
Five minutes later Fraizer Campbell went close for Cardiff with a volley from the edge of the Magpies’ box, but his effort did not trouble goalkeeper Tim Krul.
However, Pardew’s team regained the momentum thereafter and were unlucky not to take the lead on 17 minutes when Mathieu Debuchy’s header was tipped onto the bar by keeper David Marshall.
A minute later Newcastle went ahead, thanks to Ameobi, who headed in Moussa Sissoko’s cross.
Sissoko himself went close to making it 2-0 to the home side midway through the first half when his shot from outside the box took a deflection and came back off the post.
Pardew’s team were denied by the frame of the Cardiff goal again just after the half-hour mark, Sissoko once more unfortunate to see his deflected cross come back off the post.
Newcastle continued to dominate proceedings at St James’ Park in the second half, as Michael Williamson’s deflected effort went narrowly wide of the mark.
However, visitors Cardiff had a succession of chances after 75 minutes, before the hosts scored two late goals.
Remy made it 2-0 with a simple finish from close range and Taylor wrapped up the victory in the first minute of injury time.