The Perpignan side knew a win would put them eight points clear of Bradford with the Bulls having just three games to play and, with their mission complete, it is now a three-way fight for the last play-off spot between the West Yorkshire club and the two Hull clubs.
None of that will be of concern to either of these sides, though, with Wigan heading to the capital to meet Hull in the Challenge Cup final next weekend, knowing their chances of finishing top of the table are now over.
Huddersfield are the favourites for that honour after a win over London and only Warrington can catch them as a consequence of this result, meaning Wigan must focus on their date with Hull and then forging a route through the play-offs if they want to get to Old Trafford for the Grand Final.
The trip did at least yield an appearance from star man Sam Tomkins, however.
Naming Tomkins in his side after an injury-hit summer gave coach Shaun Wane a great pre-match fillip, but the full-back was unable to contribute too much in a stop-start opening period.
Catalan went ahead after 17 minutes as Freddie Vaccari crashed over for a score which was approved by the video referee.
Thomas Bosc converted but the home side started to invite pressure with a series of errors which allowed Wigan to set up camp in their half.
After three sets did not yield a try, Scott Taylor took the direct route on the stroke of the half-time hooter and smashed his way over, with Pat Richards converting.
A cagey opening to the second half saw the two sides trade penalties through Bosc and Richards, but Catalan eventually pulled clear.
Bosc split the posts with two more penalties to open a four-point gap and then 39-year-old Steve Menzies pushed his way over.
Wigan were unable to respond and Eloi Pelissier put them further out of sight with a try converted by Bosc.