two of the biggest matches of the season will take place simultaneously next month when the barclays premier league clash between manchester united and chelsea kicks off 10 minutes after arsenal's fa cup semi final against reading the football association announced on thursday that the first semi final at wembley between the gunners and steve clarke's men will take place at 520pm on saturday april 18 and be broadcast live on bbc one that sees it go head to head with sky sports' evening kick off between chelsea and united which is due to start at 530pm marouane fellaini (right) looks to take the ball past gary cahill during manchester united's premier league match against chelsea at old trafford last october  arsenal players celebrate after beating hull in the fa cup final at wembley last year  the second semi final between aston villa and either blackburn or liverpool will be screened by bt sport 1 on sunday april 19 with a 3pm kick off the afternoon kick off will be welcomed by fans having to travel back to the north west and midlands on sunday evening arsenal, reading and villa have all been allocated 31,500 tickets for the semi finals with further details to be released following the quarter final replay on april 8 jose mourinho (centre) looks on during chelsea's premier league match against southampton  aston villa fans celebrate victory on the pitch after beating west brom in the fa cup sixth round 
arsenal 520pm chelsea bbc one wembley manchester united sky sports 530pm april 18
arsenal's fa cup semi final against reading takes place on april 18  the match at wembley kicks off at 520pm and is live on bbc one  chelsea vs manchester united starts at 530pm on sky sports 