Qantas Airways Ltd's (ASX: QAN) budget airline Jetstar has hinted it could further expand in Singapore and New Zealand this year as it forecasts opportunities in the region to grow, The Australian reported.

Jetstar Australia-New Zealand chief executive David Hall told the paper he projects A330 services to and from the Asian hub would continue to see strong growth as Jetstar added direct Auckland-Singapore services in March.

Outbound tourism from Australia and New Zealand to Singapore as well as the 22 destinations serviced from the city state by Jetstar Asia, was a "tremendous proposition", but "You could see a Auckland-Melbourne-Singapore, Singapore-Auckland-Melbourne-type proposition," Mr Hall told the paper.

Meanwhile, Jetstar is reportedly advertising and booking flights from Auckland direct to Singapore despite not having clearance to fly there yet.

The budget airline, however, defended its action, saying this is standard practice in the industry unusual it may seem.

Jetstar spokesman James Aanensen said "it is correct to say that it is not approved in terms of the minute details but it's not unheard-of.

"It does seem a bit odd but I can guarantee that it's a standard formality for every flight. The airline is very confident that it will go ahead. It's not something they can do on the spot."