The seventh-seeded Croatian, who was US Open champion in 2014, will face either seven-time Wimbledon winner Roger Federer or Tomas Berdych in Sunday's final.
"It's unbelievable. I have played really well from the start of the tournament," said 28-year-old Cilic.
"Sam played at a high level especially in the first set. I was 4/1 up in the tie-break and didn't convert.
"But after that I was better in the return games. I thought the level was really high.
Cilic fired 25 aces and 70 winners past world number 28 Querrey, the man who ended Andy Murray's reign as Wimbledon champion in the quarter-finals.
Cilic trails Federer 6-1 in head-to-head meetings and is level at 6-6 against Berdych.
Whoever he faces on Sunday, he said he is ready for the challenge.
"It's definitely going to be a huge semi-final between Roger and Tomas. It's an open match," he said.
"Roger is playing the best tennis of his career on this court. Whoever it is I will be ready."
"I never doubted it. Who knows what will happen in the final? It's great to see Cilic there," Ivanisevic told the BBC.
Cilic took a 4-0 career lead over Querrey into Friday's semi-final, including a marathon 5hr 31 min win at Wimbledon in 2012, the second longest match in tournament history.
There were signs that spectators were in for another long afternoon with no break points at all in the first set as the serve of the two 6ft 6in (1.97m) giants dominated.
- Overwhelming favourite -
==========================
Cilic was unable to convert break points in the first and fifth games of the second set but the pressure eventually told and he broke through for the set-deciding game at 4-3.
The third set was equally tight, a break apiece in the third and fourth games with another tiebreak required.
Querrey was a break to the good again in the fourth set, but Cilic clawed his way back to 4-4 before claiming victory with another power-packed forehand winner.
Federer has defeated his Czech opponent 18 times in 24 meetings.
The Swiss star is bidding to reach an 11th final at Wimbledon, having made the semi-finals without dropping a set and being broken just three times.
Victory will make Federer the second oldest finalist after Ken Rosewall who finished runner-up in 1974 at the age of 39.
Playing in his 42nd Grand Slam semi-final, he is the overwhelming favourite after 'Big Four' rivals Murray and Novak Djokovic suffered injury-hit exits on Wednesday and Rafael Nadal lost in the last 16.
The 31-year-old knocked out eighth-seeded Dominic Thiem in five sets in the last 16 before seeing Djokovic retire with a right elbow injury in their quarter-final.
Disclaimer: No Business Standard Journalist was involved in creation of this content
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
