Match ends, Manchester City 1, Brighton and Hove Albion 0.
Manchester City stayed on course for the quadruple as they reached the FA Cup final after edging out Brighton at Wembley.
Pep Guardiola's side were nowhere near their best but a largely undistinguished contest was settled by Gabriel Jesus' stooping header after only four minutes, converted from Kevin de Bruyne's perfect right-wing cross.
Brighton battled manfully but could not turn possession into prolonged threat, although City were grateful to Aymeric Laporte's clearance from right under his own crossbar after the break with Glenn Murray poised to score.
Manchester City defender Kyle Walker was fortunate to escape a first-half red card after a VAR review for thrusting his head into the face of Alireza Jahanbakhsh after the pair clashed - and ultimately they were happy to simply close out the win.
They will now face either Watford or Wolves in the final at Wembley on 18 May and also remain in the hunt for the Premier League and Champions League after winning the Carabao Cup.
Manchester City battle through
Manchester City have a list of three further targets as they chase a historic quadruple - the FA Cup, Premier League and Champions League.
Some may regard as the FA Cup as the least pressing of those priorities but Pep Guardiola's team selection and body language here at Wembley illustrates the importance he attaches to this historic competition, a trophy that has so far eluded him since his arrival in England.
The Catalan was animated throughout, often in fury, but his fist-pump to his backroom team as City moved into an attacking position in stoppage time showed he wants the FA Cup on his - and his club's - CV very badly.
Make no mistake, City were were light years away from their imperious best, failing to confirm their authority after an early goal that ripped up Brighton's blueprint of containment.
But, for a side that has world-class attacking football as its trademark, City gave very little away at the back and most key aerial challenges were won.
City did not excel - but they are in the FA Cup Final and move on to face Tottenham Hotspur in the Champions League quarter-final first leg in the Londoners' majestic new stadium on Tuesday.
Brighton lack killer touch
Brighton's players were given a standing ovation at the final whistle from the supporters who packed their portion of Wembley, in recognition of the endeavour they had displayed.
It was deserved for the effort they put in which kept them in contention right until the end after it had looked like they may be swept aside once City struck the early blow.
In reality, however, they barely laid a glove on City for all their possession, the only real scare coming when Laporte had to hoist that second-half clearance over his own crossbar with Murray poised.
The Seagulls were never lacking in application but they just did not have the pace or threat to provide the final flourish to decent build-up work.
Chris Hughton's side will take credit from their performance but, on reflection, may also regard it as something of a missed opportunity as they came up against an off-colour and uninspired City team.
The hopes of their first FA Cup final appearance since 1983 have disappeared and now it is back to the more routine business of ensuring Premier League safety.
Man of the match - Aymeric Laporte (Manchester City)
Quadruple 'almost impossible' - manager reaction
Manchester City manager Pep Guardiola: "It was a semi-final, Brighton are an incredible defensive team, we knew that set pieces were huge, massive. We conceded too many but only one dangerous situation. We are in the final, we are there.
"My opinion is that nobody has done it [won the quadruple] so why can we do it? It is almost impossible to achieve everything, that is the truth. Our fans will come, more than today, for the final, we are losing players every game but still we will try to do it.
"I am happy to be in the final, we extend our season by one more week and we are happy for that."
Brighton manager Chris Hughton: "I am incredibly proud. After conceding after three minutes I don't think there was anyone in the stadium that thought the second wasn't going to come. We hung in and to go through the 90 minutes and, apart from the goal, I struggle to think of a real clear chance. That wouldn't have happened often. if at all, to them this season.
"We have raised the bar today in the level of our performance. The most important thing is to take that into the difficult games. We have got vitally important home games. We have to get something from those two."
Manchester City enjoy their trip to Wembley - the stats
- Manchester City have reached their 11th FA Cup final, and first since 2013 when they eventually lost to Wigan.
- City have become the ninth different team to reach both major domestic English cup finals within the same season, after Arsenal, Chelsea, Everton, Liverpool, Manchester United, Middlesbrough, Sheffield Wednesday and Tottenham Hotspur.
- Brighton have never won in five competitive matches at Wembley in all competitions, drawing one and losing four.
- City have scored 20 goals in the FA Cup this season, the most by a team in a single season in the competition since Chelsea in 2011-12 (also 20).
- City are unbeaten in their last six games at Wembley in all competitions (W5 D1), conceding just one goal in those matches.
- Forty percent of Brighton's shots in this match were taken by centre-back Shane Duffy (2/5).
- City boss Pep Guardiola has become the first manager to reach both major domestic English cup finals in the same season since Kenny Dalglish with Liverpool in the 2011-12 campaign.
- City striker Gabriel Jesus has scored 12 goals in 15 appearances in cup competition this season (FA Cup, League Cup and Champions League) compared to six goals in 25 appearances in the Premier League.
City's bid for the quadruple continues on Tuesday as they return to Champions League action. They meet Tottenham in the first leg of their quarter-final at 20:00 BST.
Brighton's next game is an important home Premier League fixture against Bournemouth on Saturday (15:00) as they bid to avoid relegation.
- 2WalkerBooked at 32minsSubstituted forDaniloat 45'minutesBooked at 50mins
- 22MendySubstituted forStonesat 79'minutes
- 17De BruyneSubstituted forFernandinhoat 65'minutes
- 20Bernardo Silva
- 33Gabriel Jesus
- 5DunkBooked at 72mins
- 8BissoumaSubstituted forLocadiaat 82'minutes
- 17MurraySubstituted forAndoneat 66'minutes
- 16JahanbakhshBooked at 32minsSubstituted forIzquierdoat 70'minutes
- Anthony Taylor
- Shots on Target
Second Half ends, Manchester City 1, Brighton and Hove Albion 0.
Bernardo Silva (Manchester City) wins a free kick on the left wing.
Foul by Jürgen Locadia (Brighton and Hove Albion).
Attempt saved. Raheem Sterling (Manchester City) left footed shot from the centre of the box is saved in the bottom left corner. Assisted by Gabriel Jesus.
Foul by Fernandinho (Manchester City).
Shane Duffy (Brighton and Hove Albion) wins a free kick in the attacking half.
Foul by Gabriel Jesus (Manchester City).
Mat Ryan (Brighton and Hove Albion) wins a free kick in the defensive half.
Attempt missed. Danilo (Manchester City) right footed shot from outside the box is just a bit too high. Assisted by Fernandinho.
Attempt saved. José Izquierdo (Brighton and Hove Albion) right footed shot from outside the box is saved in the top centre of the goal. Assisted by Davy Pröpper.
Foul by Raheem Sterling (Manchester City).
Bernardo (Brighton and Hove Albion) wins a free kick on the left wing.
Nicolás Otamendi (Manchester City) wins a free kick in the defensive half.
Foul by Florin Andone (Brighton and Hove Albion).
Substitution, Brighton and Hove Albion. Jürgen Locadia replaces Yves Bissouma.
Offside, Brighton and Hove Albion. Bernardo tries a through ball, but Lewis Dunk is caught offside.
Corner, Brighton and Hove Albion. Conceded by Danilo.
Substitution, Manchester City. John Stones replaces Benjamin Mendy.
Corner, Manchester City. Conceded by Lewis Dunk.