Armagh made a storming start in Killarney with Joe McElroy going close to an early goal, but his shot landed the wrong side of the post.
Paul Geaney got the first point of the game for the hosts, but Armagh’s incisive play paid dividends as they rattled off the next four scores to move ahead.
They were soon pegged back however, through a combination of their own wastefulness and some David Clifford brilliance.
The Orchard County hit four wides in a row before Kerry and David Clifford, who had been quiet up until the 12-minute mark, sparked into life as, on his 50th championship appearance, he fired low into the far corner for his 26th goal after latching onto a fine pass from Dylan Geaney.
He followed that up with another score before momentum swayed back in the favour of Armagh through points from Ross McQuillan and Jason Duffy.
The end-to-end nature of the absorbing contest continued as Clifford notched another point and Dylan Geaney added three, including a two-pointer, to move Kerry ahead.
A close-range free from Conor Turbitt and a score from Oisin Conaty brought Armagh back within a point, but not for long as a two-pointer from David Clifford increased Kerry’s lead back out to three.
Armagh then suffered a hammer blow on the stroke of half-time as they conceded a second goal as a result of some poor game management.
As Kieran McGeeney’s side pushed for a late point before the hooter, Jarly Og Burns surrendered possession cheaply and, with Ethan Rafferty out of his net, Paul Geaney collected a long pass and stroked the ball into an empty net to give the Kingdom a six-point lead at the break.