It was 2-0 at half-time as Dominic Di Paola’s side proved too strong for step four Westfield following a 2-2 draw in Saturday’s tie.
Lucas Rodrigues opened the scoring and Charlie Hester-Cook doubled the advantage soon after following a Rodrigues cut-back.
It was 3-0 just after the hour when Reece Myles-Meekums forced Field defender Billy Nutbeam into an own goal, then James Roberts and Greg Luer set up Shamir Fenelon for the fourth.
Luer and Roberts then got one each in the closing minutes to make it 6-0, and set up a home tie against Isthmian Premier outfit Folkestone Invicta in the next round on Saturday week, September 27.
The Hornets are back in National League South action this Saturday when they entertain eighth-placed AFC Totton.
See some of John Lines’ pictures from the game on this page and the ones linked – and you can read all the latest from the Hornets in the West Sussex County Times, out every Thursday.
17. FA Cup: Horsham FC give Westfield six of the best in second qualifying round replay - the match in pictures
Horsham FC are through to the third qualifying round of the FA Cup after a comprehensive home victory over Westfield in Tuesday night’s second qualifying round replay. Photo: John Lines
18. FA Cup: Horsham FC give Westfield six of the best in second qualifying round replay - the match in pictures
Horsham FC are through to the third qualifying round of the FA Cup after a comprehensive home victory over Westfield in Tuesday night’s second qualifying round replay. Photo: John Lines
19. FA Cup: Horsham FC give Westfield six of the best in second qualifying round replay - the match in pictures
Horsham FC are through to the third qualifying round of the FA Cup after a comprehensive home victory over Westfield in Tuesday night’s second qualifying round replay. Photo: John Lines
20. FA Cup: Horsham FC give Westfield six of the best in second qualifying round replay - the match in pictures
Horsham FC are through to the third qualifying round of the FA Cup after a comprehensive home victory over Westfield in Tuesday night’s second qualifying round replay. Photo: John Lines