A trans-pacific flight such as this (round trip) is usually available for about 100K frequent flier miles. If you go out of season it maybe possible to go for less. Business class would usually cost more.
The Qantas Frequent Flyer program is a wonderful program that allows you to earn points through such events as using credit cards and car rentals. One can redeem these points for many different products at the Qantas online store.
The number of Qantas Frequent Flyer points required for a return trip from Sydney to Nadi can vary based on factors like the class of service and availability. Typically, a one-way economy class ticket may require around 20,000 to 30,000 points, making a return trip approximately 40,000 to 60,000 points. It's best to check the Qantas website or app for the most current points requirement for your specific travel dates and preferences.
You don't mention which city you're flying from, but Sydney to Mackay will use up 12000 points (one-way) or 21700 points with taxes (one-way).
It is unknown and is not the sort of information that airlines release as the information would be valuable to a competitor.
It needs a minimum of 250,000 frequent flyer miles
The vast majority of the major airlines around the world have frequent flier programs.
There are many benefits of being a frequent flyer. You can collect points and discounts for your next flight, you may get priority boarding and you may also have rights to an airport lounge.
If you are patient and book well in advance and do not fly at peak times it can be as low as 50,000 miles. If you want to fly other times it will be nearer 100,000 frequent flyer miles
You will earn points with each flight you make on American Airlines. You can then redeem the points for flights or for upgrades on flights.
First you have to take into consideration various factors such as the required credits, credit expiry and rewards available. Many people prefer American Airlines as it's the first and largest frequent flyer program.
Actually, there are many different type of rewards available. Some of them include for example: frequent flyer points, cash back points or several kinds of gift certificates.
Some ways to earn free frequent flyer miles faster include signing up for a credit card that earns miles, purchasing miles at auction sites, and obtaining free miles by special offers or by receiving the airline's newsletter etc.