Cheapest Day to Buy Flights from San Francisco to Sydney
San Francisco to Sydney is 11,950 km (7,425 mi) great-circle — usually 12 h+ with at least 1 stop. Fares typically bottom out 3–12 weeks before departure; the calendar below shows the cheapest price for every day of the next 12 months.
Check live prices on Aviasales ↗Low Fare Calendar — San Francisco to Sydney
When to book vs. when to fly — San Francisco → Sydney
Live data from recent Aviasales searches for SFO → SYD, plus a booking rule of thumb.
Lowest indicative per-adult round-trip fares seen in Aviasales searches — confirmed live on the booking site before payment.
See the cheapest month’s fares ↗Search any date — San Francisco → Sydney
Flight options — San Francisco → Sydney
Recently-seen round-trip fares — click any flight for details, alternatives and booking.
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FAQ — SFO → SYD
How much is a flight from San Francisco to Sydney?
Prices vary by season and departure day. The Low Fare Calendar on this page shows the cheapest fare for every day of the coming year between San Francisco (SFO) and Sydney (SYD).
Which airlines fly from San Francisco to Sydney?
The San Francisco → Sydney route covers about 11,950 km and usually 12 h+ with at least 1 stop. Multiple carriers operate it — search FlyTiming to compare every airline and agency serving SFO → SYD in one search.
What is the cheapest day to fly from San Francisco to Sydney?
It varies by month. The price card on this page highlights the cheapest month and the historically cheapest day of the week to fly this route — the Low Fare Calendar below marks low-fare days in green.
When is the best time to book flights from San Francisco to Sydney?
As a rule of thumb, fares on international routes are usually lowest roughly 3–12 weeks before departure — and seasons flip between the two ends — July is midsummer in one and midwinter in the other, so shoulder months (April–May, September–October) often price best. The calendar below is the fastest way to spot the cheapest months for San Francisco → Sydney.