Cheapest one-way flights from Seattle to Sydney in December from 311€

AirHint found the following cheapest one-way flights from Seattle (SEA) to Sydney (SYD) in December 2025 (see full year).

One-Way flights

06 Dec Air Canada
13 Dec Korean Air
22 Dec Air Canada
19 Dec Air Canada

Also check the deals for return flights from Seattle to Sydney in December.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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