Oval: England captain Andrew Strauss won the toss and elected to bat in the fifth and final Test at Oval on Thursday.
As expected Flintoff is fit to play in England side, It's Onions who makes way for the all-rounder.
South Africa-born Jonathan Trott is the new face in England Team. England dropped Ravi Bopara after making just 107 runs in the first four Tests of this series.
Australia have fielded an unchanged side.
Key facts, figures for the fifth Ashes Test
England (Playing XI): Andrew Strauss(c), Alastair Cook, Ian Bell, Paul Collingwood, Jonathan Trott, Matthew Prior(w), Andrew Flintoff, Stuart Broad, Graeme Swann, James Anderson, Stephen Harmison
Australia (Playing XI): Simon Katich, Shane Watson, Ricky Ponting(c), Michael Clarke, Mike Hussey, Marcus North, Brad Haddin(w), Mitchell Johnson, Peter Siddle, Stuart Clark, Ben Hilfenhaus