Media reports had suggested the trip would begin as soon as Sunday and last two days
Murray, who could face defending champion Rafael Nadal next, is the first Briton into the last eight here since John Lloyd in 1985.
The young Scot showcased his exciting strokeplay against the big-serving American and has yet to drop a set in his four victories at the year’s opening Grand Slam.
Murray, the 2008 US Open finalist, has now given himself a chance to have a crack at Nadal in the quarters, with the Spanish second seed taking on unseeded Croat Ivo Karlovic later Sunday.
“I’ve been moving pretty well and I played some great shots out there, so I haven’t got much to complain about so far,” Murray said.
He neutralised the 6ft 9in (2.06 metre) tall Isner’s serve, which he rated one of the best in men’s tennis.
“He has one of the best serves and I had my coach serving at me from the service line this morning just to get used to his height, but once you get out there it’s still tricky,” Murray said.
“The first set was the key because he is a little bit tired after he won the Auckland tournament last week and he’s had some long matches and he’s winning doubles here as well.”
It was Murray’s greater variety of strokes, including drop shots and volleys to the feet of Isner, which proved decisive.
Murray earned three service breaks and only conceded four break points in not dropping his serve in the two hour 12 minute contest on Rod Laver Arena.
While the imposing Isner, 8-2 this season, produced the greater number of winners (43), Murray’s was immaculate and only made eight unforced errors in the 30 games.
Isner, who was bidding to reach the quarter-finals of a Grand Slam for the first time, finished the tournament with 95 aces.
Media reports had suggested the trip would begin as soon as Sunday and last two days
Visitors can enjoy movies with family favourites, including ‘The Jungle Book’, ‘Jumanji’ and ‘Zootopia’ to match the wild theme every evening from 8pm
Sheikh Mohamed conveyed his congratulations to all eight honourees, recognising their inspiring efforts and significant contributions in service to society
His father thanked everyone who participated in the search mission despite the challenges posed by flooding in various parts of the emirate
It will be humid by night and Sunday morning with a probability of mist formation over some coastal and internal areas
Nearly 6,000 volunteers linked to a single support group are working tirelessly across the country to help those affected
Real estate developer MAG pledges to cover all the costs of necessary repairs for affected residents
The substantial increase in charges left many residents financially burdened, as they strive to retrieve their stranded vehicles