Following this holiday, the average domestic airfare in September and October will be $378 according to Hopper's data. This is 37 per cent ($234) cheaper than prices during peak summer.
West Coast sees the biggest drop
Fortunately, popular West Coast destinations will experience the largest drops in price from summer to autumn.
The average round trip airfare to San Diego will almost halve in price from NZ$400 to $365.
In Portland, Oregon, prices will fall by $346 to an average of $499.
International flights drop in price too
Internationally, an overseas round trip airfare cost an average of $1200 in September and October, according to Hopper.
While this is 17 per cent higher than 2019 prices, it was $285 cheaper than a few months earlier in peak summer.
When is the best time to book?
For the best prices, Hopper found the best time to book a domestic flight was three to six weeks in advance. International flights should be booked at least four weeks ahead of travel.