The last time I priced this route, I spent an hour staring at a screen and realized the flight itself was the trip. We are talking about a 14 to 16 hour leg from Los Angeles or San Francisco, plus a layover somewhere like Auckland or Brisbane if you did not book a direct service. For us, the decision between visiting in September or December comes down to about $1,400 in airfare and a difference of roughly eight degrees Celsius on the ground.
If your kids are like mine, you are locked into the Christmas break, which means you are paying peak prices whether you like it or not. The last time we priced flights to australia for late December, the cheapest economy seats we could find on Qantas or United were running about $1,850 per person round trip from LAX. That is $7,400 for the four of us before we had booked a single night of accommodation, and that figure assumes you are willing to take the red-eye outbound and a connecting flight home.
September is the quiet winner if you have any flexibility at all. Australian schools go back in late January, so the two weeks after New Year are actually worse than Christmas itself, which is a counterintuitive trap that caught us once. In mid-September, the same Sydney route drops to around $1,050 to $1,200 per person on the price view I keep in a tab, and the city is coming out of winter. Average highs sit at 20 degrees Celsius, which is perfect for the Bondi to Coogee coastal walk without the summer crowds, and the whales are migrating north along the coast.
I will be straight with you about the trade-offs, because the cheap months are cheap for a reason. May and June are the absolute bottom of the market, with fares dipping below $900 per person, but you are gambling on rain and the tail end of winter starting earlier than the calendar says. We went once in early June and spent two of our seven days inside the Australian Museum watching the kids run out of patience, because the harbour was too grey for the ferry rides we had planned.
- Check the visa requirements before you book anything, because the ETA for visitors is quick but the system can stall
- Add 48 hours to your itinerary for recovery on the first two days, jet lag hits children harder than adults
- Compare the total cost with bags included, since budget carriers quote a base fare that climbs by $120 per person with luggage
- Book accommodation in Circular Quay if you can, because the train from the airport costs $17 per adult and adds up fast
- Look at the sunrise times in winter, because Sydney’s short days make the morning light worth getting up for
From LAX, the direct Qantas service runs about 14 hours and 50 minutes, covering 12,000 km, and no airline makes that pleasant. For the shoulder season, I would book between 10 and 14 weeks out, because the airlines hold their September prices steady until about six weeks before departure, then start nudging them up as the school holiday crowd books. If you are stuck with Christmas, book at the 12 month mark when the schedules first open, because the difference between booking ten months out and four months out on the same dates is usually around $400 per ticket.
What settled it for us was the exchange rate, honestly. The Australian dollar has been soft against the US dollar, so our September trip two years ago cost about 15 percent less on the ground than the same itinerary would have in December, and that matters when a family dinner in The Rocks runs you $140. You can compare the current numbers for yourself and see here what the spread looks like this year, because the seasonal pattern holds even when the absolute prices shift.
If you can take them out for a week in September, you will save enough to pay for the Sydney Opera House tour and still have money left for the Taronga Zoo. If you cannot, book the December flights exactly eleven months out, pack for humidity, and accept that you are paying for the privilege of escaping your own winter.
