Championship leaders Queens Park Rangers were held 2-2 at home by Bristol City on Bank Holiday Monday, but Swansea failed to capitalise as they lost.
Norwich joined Swansea on 43 points after earning a 1-1 draw at Middlesbrough. QPR have 48.
Leicester beat Cardiff's Welsh rivals Swansea 2-1 at the Walkers Stadium, Darius Vassell hitting the winning goal.
Fourth- and fifth-placed Leeds and Cardiff play on Tuesday evening.