Stevie May scores 51 seconds after coming on at half-time to break deadlock; Cammy MacPherson's deflected second puts hosts in firm control
Callum Hendry then Shaun Rooney both dink ball over keeper in closing minutes to seal Premiership safety
Inverness scored two late goals in first leg to salvage draw
FT: St Johnstone 4-0 Inverness CT (6-2)
That'll do us. Thanks for joining us tonight and throughout the season.
St Johnstone fans, your side will be in the Premiership next campaign.
What an end to the season. It's been a long one... but memorable as well.
Just the small matter of Scotland trying to reach the World Cup to come next week...
Image source, SNSFT: St Johnstone 4-0 Inverness CT (6-2)
St Johnstone boss Callum Davidson tells BBC Sportsound: "It's relief more than anything else. It is a fantastic achievement from the players and the supporters have been phenomenal for us.
"We were in a really dark place in November-December and we have been fighting like mad to stay in this league so credit to everyone involved, the chairman, backroom staff, everyone.
"This may sound stupid, but for me, this is a bigger achievement that winning the cups because mentally it is really difficult.
"It's easy when you're winning games, but mentally tough when you are losing games, players getting injured and challenging situations.
"We don't want to be fighting at the bottom, we want to be top six."
FT: St Johnstone 4-0 Inverness CT (6-2)
Image source, SNSCallum Hendry's lovely dink made it 3-0
Image source, SNSShaun Rooney's identical finish made it four soon after
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FT: St Johnstone 4-0 Inverness CT (6-2)
Inverness boss Billy Dodds tells BBC Sportsound: "I'm proud and disappointed. Proud of the players for the season, disappointed the way it has turned out.
"I'm not saying we dominated the first half but we had them where we wanted them and put the pressure on them. 4-0 was harsh on my boys.
"When they got their chances, they took them. When we had our chances, we missed them.
"It wasn't the fitness tonight, more naivety. But we will learn from that for next season. I wanted to make history and be the first team to be promoted over the six games, but we just fell short."
FT: St Johnstone 4-0 Inverness CT (6-2)
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St Johnstone 4-0 Inverness CT (6-2)
St Johnstone defender Shaun Rooney tells BBC Sportsound: "From the first leg there was a bit of frustration that we lost two goals. Tonight our class showed.
"It is a good finish, I will give myself credit. I used to be a striker so maybe more to come.
"I was calm coming into this one, I said to some of the boys on the way up if we played the same as we did on Friday we should coast it.
"We don't want to be a Championship club, this club should be in the Premiership and credit to the fans. They have been here all season and it is us who haven't always turned up."
FT: St Johnstone 4-0 Inverness CT (6-2)
Inverness defender Kirk Broadfoot tells BBC Sportsound: "It is obviously hard to take. I think you would say for 60 minutes of the first leg, St Johnstone were the better side.
"But we got ourselves back into it. Tonight, I think for the first half, we were the better side.
"We came out in the second half and goals change games unfortunately. No one has done it [been promoted after finishing third or fourth] - but we fancied ourselves. It's a tough ask for six games in 21 games.
"My time at Inverness has come to an end, I will be moving on and if I do keep playing, hopefully it'll be more local."
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FT: St Johnstone 4-0 Inverness CT (6-2)
Fair play to the Inverness fans, they've stayed behind to give their team the reception they deserve.
They've done themselves proud. They'll look to kick on next season now.
FT: St Johnstone 4-0 Inverness CT (6-2)
Stuart Kettlewell
Former Ross County manager on BBC Sportsound
Quote MessageIn large spells of this tie, Inverness gave St Johnstone a real scare and Billy Dodds, I don't think, will be asking too many questions of his players.
FT: St Johnstone 4-0 Inverness CT (6-2)
Rory Loy
Former Dundee & St Mirren forward on BBC Sportsound
Quote MessageOver the piece, there were two outstanding halves from St Johnstone that have won them the tie. But tonight, in the second half, they have blown Inverness away and they were clinical. They didn't give Inverness a sniff.
FT: St Johnstone 4-0 Inverness CT (6-2)
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FT: St Johnstone 4-0 Inverness CT (6-2)
Sky Sports
Ex-Scotland striker Kris Boyd: Callum [Davidson] is buzzing, but trust me - it's relief. You can see it means so much to him. I'm delighted for him.
After the first 45 minutes tonight, it was hard to see this coming.
But St Johnstone blew away Inverness in the second half with goals from Stevie May, Cammy MacPherson, Callum Hendry and Shaun Rooney.
Scenes at McDiarmid Park. Callum Davidson is going wild.
Image source, SNS
Shaun Rooney
Cool. As. You. Like. Again.
St Johnstone break forward again and this time it's Shaun Rooney who is free.
The defender finishes with almost an identical effort to Callum Hendry's.
Lovely stuff.
Image source, BBC SportSt Johnstone 3-0 Inverness CT (5-2)
Stuart Kettlewell
Former Ross County manager on BBC Sportsound
Quote MessageWhat an unbelievable finish from Callum Hendry. He looks as if he is playing in the park with a group of his mates, not in a situation to keep his team in the Premiership. He jogs towards the goalkeeper, waits for Ridgers to go down and it is a beautiful little dink of a finish.
Callum Hendry
Cool. As. You. Like.
St Johnstone have acres of space to attack into as Inverness throw bodies forward.
Melker Hallberg's pass finds Callum Hendry who races through and dinks a lovely finish over Mark Ridgers.
Image source, BBC SportSt Johnstone 2-0 Inverness CT (4-2)
Bit of pressure from Caley Thistle but St Johnstone, who have been far more solid in the second half, get their bodies in the way.
St Johnstone 2-0 Inverness CT (4-2)
Stuart Kettlewell
Former Ross County manager on BBC Sportsound
Quote MessageSt Johnstone are just managing the game well, we call it the dark arts.