World record points scorer Neil Jenkins failed to score in the last match of his career but the Warriors still managed to see off a jaded Connacht.
Connacht (3) 3
Warriors (6) 20
Tries: Havili, Parker
Cons: Sweeney (2)
Pens: Sweeney (2)
The home side opened the scoring after 12 minutes with an Eric Elwood penalty - their only points of the match.
But two Ceri Sweeney penalties ensured that the Warriors led 6-3 at half-time.
And second-half tries from Tongan wing Aisea Havili and centre Sonny Parker saw the Warriors complete their season with their fifth successive victory.
Connacht made a presentation to Jenkins at the beginning of the match.
But the 32-year-old, who entered the fray midway through the second half, did not get onto the scoresheet despite a couple of his trademark skyscraper kicks.
Connacht: Mostyn, Robinson, Yapp, T Allnut, McPhillips, Elwood,
O'Loughlin, McFarland, Jackman, Bracken, Short, Farley,
Neville, Lacey, Carroll.
Replacements: Fogarty, Clarke, Browne, McCarthey, Swift, Moore,
Celtic Warriors: E Lewis, G Thomas, Parker, Bryant, Havili,
Sweeney, Martens, G Jenkins, Rees, Horsman, Cockbain, D Jones,
R Jones, Parks, Bryan.
Replacements: Davies, Loader, Budgett, Molitika, John,
N Jenkins, Nuthall.
Referee: Malcolm Changleng (Scotland)