Daniel James grabbed his third goal in three games as in-form Leeds United made it six Championship wins from seven with a clinical performance at Ewood Park.
James drilled a fine low shot beyond keeper Leopold Wahlstedt and into the corner to put the visitors ahead after an uneventful first half.
Rovers, who have now lost six league games at home already this season, improved after the break and started to create chances, notably when Hayden Carter headed over.
But the impressive Crysencio Summerville wrapped up a victory that closes the gap on second-placed Ipswich to four points, before the afternoon kick-offs, with a clever, chipped finish as he ran through on goal.Follow Saturday's EFL action
James' fine low strike - his seventh of the season - was the first and only effort on target during an even first half low on clear-cut chances.
Blackburn, whose boss Jon Dahl Tomasson was absent from the dugout serving a one-game touchline ban for his red card in their defeat by Sheffield Wednesday last weekend, won seven corners, but they could not trouble keeper Illan Meslier, with James Hill's looping header as close as they came.
Predictably, Rovers' top scorer Sammie Szmodics was their most likely source of a goal, narrowly failing to get on the end of a Harry Pickering cross and then heading wide after James put the visitors ahead.
Leeds, who are now unbeaten in seven matches and have won nine from 11, had the better first-half chances, Joel Piroe unlucky to see a curling free-kick deflected wide and Georginio Rutter firing an effort past the post.
Rovers played with greater purpose after the interval, having penalty shouts waved away when the ball hit Pascal Struijk's arm in the area and Callum Brittain shooting into the side netting.
But Summerville's ninth goal of the season, from Arche Gray's delightful pass, doubled United's lead and ended any realistic hopes of a Rovers win which would have put them into the final play-off spot.
Leeds held on despite continued late home pressure which saw Meslier make a stunning save from substitute Arnor Sigurdsson and referee Bobby Madley wave away more claims for a spot-kick when Jake Garrett went down in the box as he tussled with Ethan Ampadu.
Formation 4-2-3-112Wahlstedt4HillSubstituted forEnnisat 80'minutes17CarterBooked at 79mins16S Wharton3Pickering6Tronstad23A WhartonBooked at 65minsSubstituted forGarrettat 80'minutes24MoranBooked at 17minsSubstituted forMarkandayat 84'minutes8Szmodics2Brittain20LeonardSubstituted forSigurdssonat 45'minutes
Formation 4-2-3-11Meslier22GrayBooked at 63mins14Rodon21Struijk25ByramSubstituted forSpenceat 70'minutes4AmpaduBooked at 85mins8Kamara20JamesSubstituted forGnontoat 69'minutes7PiroeSubstituted forGruevat 89'minutes10SummervilleSubstituted forAnthonyat 84'minutes24RutterSubstituted forJosephat 89'minutes
Match ends, Blackburn Rovers 0, Leeds United 2.
Second Half ends, Blackburn Rovers 0, Leeds United 2.
Offside, Blackburn Rovers. Niall Ennis is caught offside.
Foul by Scott Wharton (Blackburn Rovers).
Wilfried Gnonto (Leeds United) wins a free kick on the left wing.
Substitution, Leeds United. Mateo Joseph replaces Georginio Rutter.
Substitution, Leeds United. Ilia Gruev replaces Joël Piroe.
Attempt missed. Sammie Szmodics (Blackburn Rovers) right footed shot from a difficult angle and long range on the right is close, but misses the top right corner. Assisted by Dilan Markanday.
Ethan Ampadu (Leeds United) is shown the yellow card.
Jake Garrett (Blackburn Rovers) wins a free kick on the left wing.
Foul by Ethan Ampadu (Leeds United).
Substitution, Blackburn Rovers. Dilan Markanday replaces Andrew Moran.
Substitution, Leeds United. Jaidon Anthony replaces Crysencio Summerville.
Foul by Sammie Szmodics (Blackburn Rovers).
Wilfried Gnonto (Leeds United) wins a free kick in the defensive half.
Attempt missed. Scott Wharton (Blackburn Rovers) header from the centre of the box misses to the left. Assisted by Andrew Moran with a cross following a corner.
Corner, Blackburn Rovers. Conceded by Illan Meslier.
Attempt saved. Arnór Sigurdsson (Blackburn Rovers) header from the centre of the box is saved in the top right corner. Assisted by Andrew Moran with a cross.
Corner, Blackburn Rovers. Conceded by Crysencio Summerville.
Substitution, Blackburn Rovers. Jake Garrett replaces Adam Wharton.