"The atmosphere was amazing.
"You can take it as read that the stadium in Whangarei is perfectly suited for what we would be looking for. And having Cobham Oval right next door adds to the great facilities."
Mr O'Hara warned there would need to be some financial commitment from the council, if its bid was successful.
NZF would shortlist cities and Fifa officials would visit each one before making a final decision, probably next June. He said the Whangarei and wider Northland community could do their bit by getting behind the bid.
The 2015 men's under-20 football World Cup is being held in New Zealand for the first time, with 24 teams involved.
If Whangarei is successful, the event would pump millions of dollars into the district economy, bring the next generation of football superstars to Northland, and give the region unprecedented global exposure.
The U-20 world cup is Fifa's largest tournament after the Football World Cup. It is broadcast in more than 200 countries to an audience of about 500 million.
RWC 2011 head Martin Snedden had said Whangarei's success in hosting RWC games stood the city in good stead for its U-20 bid.