Ander Herrera’s winner sent Manchester United into a record-equalling 20th FA Cup final and condemned Tottenham to their eighth successive defeat at this stage of the competition.
Spurs started at a ferocious pace and fully deserved the early lead they took after only 11 minutes when Dele Alli slid home a finish from Christian Eriksen’s cross after Davinson Sanchez’s long pass opened up Manchester United’s defence.
Jose Mourinho’s side survived the siege and levelled on 24 minutes, Wembley specialist Alexis Sanchez rising to direct an athletic header across Spurs keeper Michel Vorm from Paul Pogba’s perfect cross for his eighth goal in eight appearances at the stadium.
Eric Dier’s deflected shot hit the post on the stroke of half-time but Spurs had lost vital momentum and Herrera’s crisp low finish just after the hour set up an FA Cup final date for United with Chelsea or Southampton on 19 May.
It left Spurs suffering more FA Cup semi-final pain and with a losing sequence stretching back to their win in the last four against Arsenal here in 1991 – and Pochettino still without a trophy after four seasons at the club.
Manchester United’s style has been criticised on a number of levels this season – but the character and resilience in Jose Mourinho’s side is beyond question.
In recent weeks alone, they have come from behind to beat Chelsea at Old Trafford then recovered from 2-0 deficits to win at Crystal Palace and, most notably, at Premier League champions Manchester City.
And they needed to call on all those reserves in the face of an opening salvo from Spurs that was fierce in its intensity and pressing, as well as bringing that opening goal from Dele Alli.
United held on, with moments of good fortune, and grasped the lifeline that came with a cheap concession of possession from Spurs, a perfect cross from Paul Pogba and an athletic header from Sanchez to beat Michel Vorm in the 24th minute.
Spurs were still left cursing their luck when Eric Dier’s shot deflected off Chris Smalling to hit the foot of the post – and when ruthlessness and a clinical edge was required it was United who provided it.
It came courtesy of Ander Herrera’s low finish and gave United an advantage they never seriously looked like relinquishing.
Mourinho, now on course for another trophy after lifting the League Cup and Europa League in his first season at Manchester United last term, prides himself on his ability to inject the strengths winners require into his players.
And his Manchester United players showed that at Wembley.