Warrington coach Tony Smith described his club's inaugural Grand Final appearance as "an enormous achievement" after they set up an Old Trafford showdown with Leeds next Saturday.
The Challenge Cup winners came from 14-6 down to gain a 36-18 win over St Helens in tonight's second semi-final at Langtree Park.
"It's an enormous achievement for us," Smith said. "It's nice to be involved in Wembley for the last few years but to be in there and competing at the top of the pile in Super League is a big thing for the town and the club. I'm delighted for the owner and everybody involved in the club."
Tries from Tommy Makinson, Francis Meli and Paul Wellens put Saints on course for a seventh successive Grand Final appearance but Warrington crucially pulled a try back just before half-time through Simon Grix.
They then dominated the second half, with Australian second rower Trent Waterhouse clinching victory with two tries in a three-minute spell.
"Trent was terrific," Smith said. "He's been very good all year for us. There have probably been two games where I thought he hasn't played that great, the rest of the time he has been very good and he deserves a lot of plaudits.
"We were good in the second half and we needed to be. I thought they were better than us in the first half. We had to lift some areas and we sure did. I know it must be difficult for Saints to miss out on something they've been very good at so they must be hurting and I feel for them."
St Helens caretaker coach Mike Rush admitted conceding a try just before half-time changed the momentum of the game.
"We were real pleased with our first half and we were probably a bit unlucky to concede just before half-time," he said. "I don't think we got one penalty in the second half - it was 5-0 in penalties in a semi-final - and, once you lose momentum in a big match, it's hard to wrestle it back.
"Warrington were fantastic and Trent Waterhouse was the best I've seen him."